1 Accept Terms Of Use
2 Part 1 - General
3 Part 2 - Supporting Structures: Decks and Walls
4 Part 3 - Securing the Roof Assembly
5 Part 4 - Materials
6 Part 5 - Deck and Wall Overlays
7 Part 6 - Air and Vapour Controls
8 Part 7 - Insulation
- 8.1 Section 7.1. Design
- 8.2 Section 7.2. Materials
9 Part 8 - Reserved
10 Part 9 - Roof Field (Membrane Systems)
11 Part 10 - Perimeters and Walls
12 Part 11 - Drainage
13 Part 12 - Penetrations and Curbs
14 Part 13 - Linear Metal Flashing
15 Part 14 - The Roof as a Platform
16 Notes to Standard
- 16.1 Accept Terms Of Use

Division B - Standards
Waterproofing Roof Systems: Liquid Membranes

RGC Standard for Hot Fluid-applied Rubberized Asphalt Roofs

About the Standard

This Standard is comprised of fourteen (14) Parts that contain the requirements, guiding principles, recommendations and informative materials necessary for a roof to qualify for a RoofStar 5-Year Guarantee, RoofStar 10-Year Guarantee or RoofStar 15-year Guarantee. Requirements to qualify for a RoofStar 15-Year Guarantee are listed in each relevant Part under Section 1. All RoofStar 15-Year Guarantee requirements must be read together with the General Requirements for each Part in this Standard.

Notes to the Standard are hyperlinked from each Part and can be read by using the link in the Table of Contents for the Standard. Highlighted text within the body of the Standard indicates revisions made within the last twelve (12) months.

This Standard follows a specific structure, incorporates defined terms, and utilizes coloured text to denote specific meaning; this is explained in Division A, Part 2, "Structure and Organization of RPM and Standards". When the requirements in this Standard conflict with other resources found either in this Manual or in manufacturer's published instructions, the rules for Authority and Conflict in Division A, Article 2.3.1.2. shall be applied.

Readers are advised to review relevant materials that can be accessed through the hyperlinks embedded in the body of text.

Table of Contents
Part 1 - General
Part 2 - Supporting Structures: Decks and Walls
Part 3 - Securing the Roof Assembly
Part 4 - Materials
Part 5 - Deck and Wall Overlays
Part 6 - Air and Vapour Controls
Part 7 - Insulation
Part 8 - Insulation Overlays
Part 9 - Roof Field (Membrane Systems)
Part 10 - Perimeters and Walls
Part 11 - Drainage
Part 12 - Penetrations and Curbs
Part 13 - Linear Metal Flashing
Part 14 - The Roof as a Platform

Notes to Standard

First Edition: June 16, 2022
Previous Edition: October 20, 2023
Current Edition: Adopted October 25, 2024

All changes to this Standard are effective
November 1, 2024

© RCABC 2024
RoofStar^TM is a registered Trademark of the RCABC.
No reproduction of this material, in whole or in part, is lawful without the expressed permission of the RCABC Guarantee Corp.

Part 1 - General

Section 1.1. Design

1.1.1. General

1.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.
In addition to the Scope described in Division A, this Standard applies to the design and construction of roof systems that are site-built, or which may be factory fabricated, in part or in their entirety.

1.1.1.2. Coverage and Limitations

Coverage under the RoofStar™ Guarantee shall be as described in Division A, Article 3.2.1.2.

1.1.1.3. References

In this Standard, all references to
1. the "British Columbia Building Code" (the "Building Code", or the "Code"), to municipal or regional building codes or regulations, or to other standards, presume the current edition that is in force.
2. materials mean those materials expressly accepted by the Guarantor, unless stated otherwise.

1.1.1.4. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part and the Standard:
1. Design Authority means the individual or firm responsible for the issuance of project specifications and details to which the project will be bid and constructed. When a Contractor designs a project, the Contractor is deemed to be the Design Authority.
2. Finished roof system surface means the top surface of any roof system, inclusive of ballast or overburden.
3. Grade-level waterproofing system means an insulated or uninsulated system, designed and constructed at grade with a sheet or liquid-applied membrane, to exclude water.
4. Linear metal flashing means flashings cut and shaped from flat metal stock, to redirect water at roof perimeters and edges, or to control the flow of water in valleys and drainage spillways. Linear metal flashings also protect roof membranes from weathering and damage and provide an aesthetic finish to the roof system.
5. Guarantor (used interchangeably with RGC) means the RCABC Guarantee Corporation, which offers the RoofStar Guarantee.
6. Membrane system means the combination of field and flashing membranes which function together to waterproof underlying materials and systems.
7. Observer means a firm or person paid by the building Owner (directly, or through the RGC), who is independent (not a member) of the RCABC, and who is accepted by the RGC to provide Quality Assurance reviews during construction and after completion of the project, according to the terms and conditions set out in RCABC policy .
8. Vegetated Roof Assembly (VRA), used interchangeably in the "RGC Standard for Vegetated Roofs" with green roof or green roofing, means a functional arrangement of interacting components, inclusive of vegetation, that is designed in conjunction with a supporting roof assembly, is intended to both grow and flourish, and is often installed on a roof to control the rate of rainwater discharged through a storm drainage system .
9. Waterproofing roof system means an insulated or uninsulated roof system, designed and constructed on roofs using a sheet or liquid-applied membrane, to exclude water. This type of system typically is installed on roof slopes less than 1:4 (3” in 12”).
10. Water-shedding roof system means an insulated or uninsulated roof system, designed and constructed to shed water away from a structure, not to waterproof it. This type of system typically is installed on roof slopes greater than 1:4 (3” in 12”) but may be installed on slopes as low as 1:6 (2" in 12").

1.1.1.5. Reserved

1.1.1.6. Objectives

Every roof system shall conform to the more stringent of this Standard or the Building Code or By-law having jurisdiction.

1.1.1.7. Responsibility for Design

Each design of a roof system shall be undertaken by a person or persons qualified in the work concerned (See Article 3.1.3.1. with respect to the securement of the roof assembly).
The Coordinating Registered Professional is responsible for ensuring the design of the vegetated roof assembly complies with all applicable building, energy, and fire codes having jurisdiction.

1.1.1.8. Pre-Design Requirements

The Coordinating Registered Professional is responsible to ensure that the roof assembly design is a multi-disciplinary enterprise that aligns with the designs for structural, plumbing, mechanical, electrical, architectural, and building envelope, together with all trades whose work intersects with the Contractor’s scope of work, to minimize out-of-sequence operations that could compromise the integrity of the completed roof assembly.

1.1.1.9. Suitability of Design

The Design Authority is responsible for determining the appropriate roof assembly design and must consider (without limitation)
1. the requirements of the building code having jurisdiction,
2. the structural capabilities or limitations of the building,
3. fire resistance and the roof class requirements for the building,
4. wind loads (See Part 3 of this Standard),
5. the effects of nearby structures on the roof assembly,
6. the potential effects of reflected heat on the roof assembly,
7. roof system aesthetics, and
8. maintenance requirements, including the safety of maintenance workers.
When the roof is intended as a platform to support a vegetated roof system, the supporting roof assembly must be suitable for that purpose (See Sentence 1.1.3.1.(2)).

1.1.2. Guarantee Term Requirements

1.1.2.1. RoofStar 5-Year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.
In addition to Sentence (1), all projects shall comply with
1. the project specifications and drawings, and
2. the manufacturer's published installation requirements.

1.1.2.2. Reserved

1.1.2.3. Quality Control

Notwithstanding any other requirements in this Standard, the Contractor shall
1. bid the project to meet the more stringent of this Standard or the project specifications,
2. bid the project to include only RGC-accepted systems and materials,
3. ensure that the supporting roof assembly conforms to the requirements and limitations of Article 1.1.3.1.,
4. notify the Observer at least 24 hours before construction is scheduled to start or resume (72 hours notice is required for projects further away than 100 km),
5. ensure that construction conforms to this Standard and exhibits good workmanship,
6. ensure that samples, reports, shop drawings, ELD arrangements, certificates, manufacturer approvals, warranty documentation, and all other submittals are collected and provided to the Guarantor as required in Article 1.3.2.4., and
7. abide by all pertinent RCABC policies.

1.1.2.4. Quality Assurance

(See Note A-1.1.2.4. )

Notwithstanding any other requirements in this Standard, the Observer shall
1. verify that the materials used in construction are accepted by the Guarantor and listed in Division C of this Manual,
2. review the construction of the roof system (according to the prescribed number of observations, with consideration for the expected duration of construction) for conformance with the more stringent of
  1. this Standard,
  2. conditions and limitations in Division A of the RPM, as they apply,
  3. the manufacturer’s published requirements,
  4. the project drawings and specifications, or
  5. the Building Code having jurisdiction.
3. review and report whether the Contractor has met the policy requirements noted in this Standard, and
4. perform cut tests or other acceptable methods, whenever required, to verify that the materials and methods of construction conform to this Standard (for example, this may be required when the Contractor has completed more than 30 squares of roofing without an observation).

1.1.3. All Systems

1.1.3.1. Permitted Roof Systems

(See Note A-1.1.3.1.)

This Standard applies to new construction, and to the partial or complete replacement of existing roofs, constructed as
1. Uninsulated systems in which the membrane is bonded directly to the roof deck or an overlay, and is exposed to the weather and to sunlight, and
2. Protected roof systems, also referred to as “inverted”, in which the membrane is installed beneath other roof system or protection materials (usually insulation), and is protected from exposure to the weather and from sunlight.
Where the roof is intended to support a vegetated roof system and qualify for a RoofStar Vegetated Roof Guarantee, only a new roof or a roof that is specified for a complete roof system replacement will qualify for the Guarantee (See Article 1.1.4.2. and Article 1.3.3.2. ).

1.1.3.2. Accessibility for Maintenance

All roofs with a field elevation greater than 7620 mm (25’) above grade should incorporate access to the roof by stairs and a doorway or with a properly located roof hatch.
Any hatch, ladder or mechanical unit should be located a sufficient distance away from the roof edge (setback zone) so that other fall protection measures are not required by those using or accessing this equipment.
When it is not possible to situate a hatch, ladder, or mechanical unit outside the setback zone, guard rails should be designed for the roof edge to provide additional fall protection for those using or accessing such equipment.
Each roof should be designed to provide safe access for maintenance of roof drains, corners, or mechanical equipment, where the roof is at least 3 m (10’) above the surface of the ground, or where a hazard to a person exists, should a fall be possible (this principle also applies to roof areas intended for regular occupancy); design elements to mitigate fall hazards should align with the Code having jurisdiction, and with the Workers Compensation Act Regulations, and should include
1. tall parapets,
2. guardrails, or
3. tie-off anchors.
Where a roof is intended to support a vegetated roof system, the roof must satisfy the design and pre-construction requirements published in the “RGC Standard for Vegetated Roofs”.

1.1.3.3. Membrane Integrity Testing

(See Note A-1.1.3.3. and Figure 1.1.3.3.-A )

Electrical current membrane integrity testing shall conform to
1. ASTM D7877, "Standard Guide for Electronic Methods for Detecting and Locating Leaks in Waterproof Membranes", or
2. ASTM D8231, "Standard Practice for the Use of Low Voltage Electronic Scanning System for Detecting and Locating Breaches in Roofing and Waterproofing Membranes."
An electrical current membrane integrity test is required when anyone other than the Contractor installs overburden, amenities, or equipment, (In this Standard, the term "electrical current membrane integrity test" means a test method that uses electrical current and electronic sensing technology to detect breaches in the membrane system).
An electrical current membrane integrity test is required when the Contractor installs overburden, amenities, or equipment, but only when
1. the total project area (footprint), inclusive of planters or other waterproofed features, exceeds 18.58 m2 (200 sf), and
2. overburden, amenities, or equipment exceed 152.4 mm (6”) in depth.
When the roof assembly supports a vegetated roof system covered by a RoofStar Guarantee an electrical current membrane integrity test is optional (not required) but recommended . An electrical current membrane integrity test is required immediately prior to the installation of a vegetated roof system .
An electrical current membrane integrity test must be performed by an RGC-recognized service provider listed in Division C.
Flood testing employed as a secondary or alternative membrane integrity test is strongly discouraged for conventionally insulated roof systems because of the risk of extensive damage to system components or the building interior, and is best suited for protected roof systems (See Note A-1.1.3.3.(5)).
If flood testing is specified, it shall be conducted prior to the installation of insulation and roof coverings, and must be executed in keeping with ASTM D5957, "Standard Guide for Flood Testing Horizontal Waterproofing Installations".

Figure 1.1.3.3.-A Electronic Integrity Testing
Forming Part of Article 1.1.3.3.
(Click to expand illustration)

1.1.3.4. Electronic Leak Detection

(See Note A-1.1.3.4.)

Electronic Leak Detection (ELD), when specified by the Design Authority, shall conform to
1. ASTM D7877, "Standard Guide for Electronic Methods for Detecting and Locating Leaks in Waterproof Membranes", or
2. ASTM D8231, "Standard Practice for the Use of Low Voltage Electronic Scanning System for Detecting and Locating Breaches in Roofing and Waterproofing Membranes."
Electronic Leak Detection (ELD) is optional for waterproofing roof systems, but strongly recommended
1. for projects where multiple trades will have access to a roof that is under construction and completed, to identify breaches in the waterproofing membrane in a timely way and avoid future costly delays,
2. when the roof assembly protects a sensitive occupied space (i.e., data centres, hospitals, critical infrastructure), or
3. when the roof supports any type of overburden, amenities, or equipment, including a vegetated roof system .
When Electronic Leak Detection is specified, it shall provide detection capabilities for all waterproofed surfaces, and should extend at least 50.8 mm (2") vertically from the drainage plane at
1. all transitions,
2. any point along the entire deck perimeter, and
3. protrusions.

1.1.3.5. Hot Works

(See Note A-1.1.3.5.)

The Design Authority may specify that the Contractor must maintain compliance with the RCABC Hot Works Program and consequently manage the Hot Works conducted on site (See Article 1.3.2.1.).
When the project involves Hot Work, the Design Authority must either
1. pre-approve alternate applications already written in this Standard or another applicable Standard published in this Manual, when the specified application is deemed to be fire-sensitive by the Contractor as part of the risk assessment process, or
2. provide alternate material and application requirements in the Specification for fire sensitive locations on the project.

1.1.3.6. Variances

When a design is unable to conform to the Standard, the Design Authority may apply to the RGC for a written Variance.
Application for a written Variance must be made in writing (email correspondence is common), and must
1. identify the project name and its civic address,
2. identify the RoofStar Guarantee number (if assigned),
3. identify the Contractor (if awarded),
4. articulate the nature of the design problem,
5. identify the RoofStar Guarantee requirement to be varied, and state the desired modification (i.e., reduce the requirement for 203.2 mm (8") to 152.4 mm (6")),
6. cite the reference to which the Variance will apply (i.e., Standard name, article number, sentence number, etc.), and
7. provide design drawings, photographs, and roof plans, referencing grid lines that identify or articulate the boundaries to which the Variance will be applied.
Variances are issued by the RGC only to the Design Authority and will be distributed to the Contractor.
A Variance may be unrestricted in its scope, or it may include one or more conditions, or a restriction in coverage, that will affect the design and construction of the project, to accommodate the varied standard, but this is at the discretion of the Guarantor.
Variances are issued only for the project-specific issue identified in the written request, and do not constitute general permission to depart from the published requirements in this Standard, for any aspect of the same project or for future projects, designed or constructed by any other firm.
.

1.1.4. Replacement and Alterations

(The requirements in Subsection 1.1.3., "All Systems", shall be read together with the following Articles)

(See Note A-1.1.4.)

1.1.4.1. General Requirements

Unless expressly permitted otherwise in this Standard, the design for replacement roofing shall conform to the requirements for new roofing in this Standard.

1.1.4.2. Complete Roof System Replacement

Complete roof system replacement shall conform to the general requirements in Article 1.1.4.1., unless expressly varied elsewhere in this Standard.
Roof system replacement means the complete removal and replacement of all roof system and metal flashing materials, exclusive of the air or vapour control layers, and only new replacement materials shall be installed.
Subject to the requirements in Part 6, "Air and Vapour Controls", the decision to reuse and repair an existing air or vapour control layer remains the responsibility of the Design Authority.
Roof system replacement projects are eligible to qualify for a RoofStar 5-year Guarantee, RoofStar 10-year Guarantee, or a RoofStar 15-year Guarantee, subject to their respective requirements.

1.1.4.3. Reserved

1.1.4.4. Reserved

1.1.4.5. Tie-ins, Additions, and Alterations to Existing Roofing

Where a new roof adjoins and ties into an existing roof, the two areas must be isolated and separated by a control joint securely attached to the structure and waterproofed in keeping with the requirements in both Article 10.1.6.2., "Control Joints (Roof Dividers)", and Part 10, "Perimeters and Walls".
If project conditions do not allow for a curb joint, the Design Authority must submit an alternative design and obtain a written Variance from the Guarantor that permits the elimination of curb joints (see Article 1.1.3.6., "Variances"); any alternative design
1. must include design specifications and construction details showing a positive water cut-off that fully isolates the existing roof system from the new roof system, and
2. shall show how the new roof system will be easily distinguishable from the existing roof system.
Repairs or renovations to an existing roof system that is not covered by a RoofStar Guarantee do not qualify for a RoofStar Guarantee (the term "renovation" means the removal and replacement of, or the application of a cover to, a portion of the roof system).
Modifications or additions to a guaranteed roof are permissible, subject to various conditions, but must be made by a Contractor qualified to perform work under the RoofStar Guarantee Program.

1.1.5. Reserved

Section 1.2. Reserved

Section 1.3. Application

1.3.1. Reserved

1.3.2. All Systems

1.3.2.1. Hot Works: Contractor Requirements

The Contractor must maintain the requirements of the RCABC Hot Works Program, including (without limitation)
1. Insurance Coverage, wherein the limits carried on the Contractor’s policy must equal or exceed the minimum requirements set by RCABC, and coverage must be unhindered by warranties that limit or exclude coverage when Hot Works is required,
2. Education and training, since workers who perform Hot Works must be trained by the Contractor and kept current with acceptable methods,
3. the "British Columbia Fire Code", wherein a Fire Safety Plan, preventative methods or alternative work procedures, fire watches, and the use and placement of equipment at the project site must comply with the BC Fire Code requirements for Hot Work,
4. a Fire Safety Plan, whereby
  1. the Contractor must assess the hazards to property and persons and produce a written Fire Safety Plan prior to the start of work, and
  2. the Fire Safety Plan must be kept on the project site and must be kept current until the project is completed,
5. RoofStar Guarantee Standards, to which the Contractor must conform, at each juncture where the interface of different membranes applications constitutes part of the Fire Safety Plan,
6. a Fire Watch, in which the Contractor must, as part of the Fire Safety Plan, conduct a fire watch
  1. that complies with the "British Columbia Fire Code",
  2. is assigned to competent, trained personnel using suitable equipment, including the use of a hand-held infrared thermometer, and
  3. is documented in a written fire watch log, and
7. Hot Works Notification, wherein the Contractor shall notify the project authority or the AHJ, as and when required, that Hot Works will be performed.

1.3.2.2. Workmanship

(See Note A-1.3.2.2.)

The Contractor must take reasonable measures to protect the project from damage by the weather, during and at the completion of the project.
Open penetrations and flashings must be temporarily sealed off from the weather, even when other trades are responsible to make a permanent seal or install overlapping materials (see Article 4.2.1.1.).

1.3.2.3. Contractor Qualifications

Supervision and installation of a RoofStar-guaranteed waterproofing roof system may be conducted only by established employees of the Contractor, and every project must be supervised by a Journeyperson employee who holds a valid ticket.
A Journeyperson may supervise a maximum of three (3) apprentices and/or three (3) labourers (ref. RCABC Policy A-248).

1.3.3. Replacement and Alterations

(The requirements in Subsection 1.3.2., "All Systems", shall be read together with the following Articles)

1.3.3.1. General Requirements

Unless expressly permitted otherwise in this Standard, all replacement roofing shall conform to the requirements for new roofing in this Standard.

1.3.3.2. Complete Roof System Replacement

See the requirements throughout this Standard, which apply to both new construction and replacement of a roof system.

1.3.3.3. Partial Roof Replacement

See the requirements throughout this Standard, which apply to both new construction and replacement of a roof system.

1.3.3.4. Reserved

1.3.3.5. Tie-ins, Additions, and Alterations to Existing Roofing

Where a new roof adjoins and ties into an existing roof, the two areas must be isolated and separated by a curb joint securely attached to the structure and waterproofed in keeping with the requirements for control joints ( Article 10.1.6.2. and Article 10.3.6.2.).
If the Design Authority has obtained from the Guarantor a written Variance that permits the elimination of curb joints, the new roof system must be fully isolated from the existing roof system with a positive water cut-off that renders the new roof system easily distinguishable from the existing roof system.

1.3.3.6. Repairs and Modifications

When a roof system that is covered by an active (unexpired) RoofStar Guarantee has been damaged or otherwise requires repairs, work shall conform to the specifications of the material manufacturers, and to the requirements in this Standard, with respect to (without limitation)
1. the securement of new materials ( Part 3),
2. deck or wall overlays ( Part 5),
3. continuity of air and vapour controls ( Part 6),
4. thermal resistance ( Part 7,
5. membranes ( Part 9),
6. membrane flashing ( Part 10),
7. drains ( Part 11),
8. penetrations and curbs ( Part 12), and
9. linear metal flashings ( Part 13).
Modifications to an existing roof system covered by an active (unexpired) RoofStar Guarantee, including (without limitation) the addition of new curbs, drains, or penetrations, shall conform to all the requirements in this Standard, or as otherwise stated.

1.3.4. Reserved

Part 2 - Supporting Structures: Decks and Walls

(See Note A-2)

Section 2.1. Design

2.1.1. General

2.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

2.1.1.2. Defined Terms

( See Figure 2.1.3.1.-A )

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Common Slope means a roof with a slope 1:3 (4” in 12”, or 18 degrees), up to and including 1:1 (12” in 12”, or 45 degrees).
2. Deck overlay|| 2021-June-30 }} {{hilite | means a panel material secured to the supporting deck, to render the deck surface suitable for the installation of roofing materials.
3. Extreme Slope means a roof with a slope greater than 21:12 (21” in 12”, or 84 degrees).
4. Flat (roof) means a roof with a slope less than 1:6 (2” in 12”, or 9 degrees).
5. Low Slope means a roof with a slope 1:6 (2" in 12", or 9 degrees, up to but less than 1:3 (4” in 12”, or 18 degrees).
6. Sheathing means a rigid panel material secured directly onto framing.
7. Steep Slope means a roof with a slope greater than 1:1 (12” in 12”, or 45 degrees) up to and including 21:12 (21” in 12”, or 84 degrees).
8. Supporting deck ("deck") means the "structural surface to which a roof system is applied" (adapted from ASTM D1079-18 Standard Terminology Relating to Roofing and Waterproofing).
9. Wall means a structural or non-structural element in a building that vertically separates space. Walls may separate the outside environment from the interior conditioned space of a building, or they may separate one or more interior spaces from each other (adapted from ASTM E631-15, "Standard Terminology of Building Constructions".
10. Wall overlay means a panel material secured to the surface of a wall, to render it suitable for the installation of roofing or wall cladding materials.

Figure 2.1.1.2.-A Roof Slope
Forming Part of Article 2.1.1.2.
(Click to expand illustration)

2.1.2. Guarantee Term Requirements

2.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

2.1.2.2. RoofStar 15-Year Guarantee

To qualify for a RoofStar 15-year Guarantee, all projects shall comply with the requirements in this Part for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, and shall (for replacement roofs)
1. be designed with a minimum slope of 2% (1/4” in 12”), measured on the primary sloped planes of the roof, and
2. incorporate crickets at curbs and sleepers that impede drainage or are wider or longer than 1219.2 mm (48”).

2.1.3. All Systems

2.1.3.1. General Requirements for Roof Slope

(See Note A-2.1.3.1.)

The Design Authority must design the slope of a roof to achieve proper drainage and must take into consideration the anticipated deflection and settlement of the structure, which may interfere with drainage.
While good drainage is desirable but not always perfectly achievable, and roof waterproofing systems generally are not affected by standing water, each project design should incorporate sufficient slope to move water off the roof surface.
"Sufficient slope", which is subject to conditions that permit evaporation, shall mean that no standing water remains on the roof surface after a reasonable interval following a rainfall (See Note A-2.1.3.1.(4)).
Roof slope should be increased beyond the minimums published in this Standard when local climate conditions, such as rainfall frequency or severity, result in ongoing or significant ponding conditions (see Article 2.1.3.2. and Article 2.1.3.3. for minimum requirements).
Drainage (slope toward plumbing drains) should be achieved (in descending order of best practices) with
1. four-way slope to drain,
2. two-way slope to drain, in combination with crickets between drains,
3. slope to a common valley, or to gutters, or
4. positive sloping valleys to drains (highly recommended).

2.1.3.2. Roof Slope for New Construction

All new construction roofs must be designed and built with a slope of no less than 2% (1/4” in 12”), measured on the primary sloped planes of the roof.

2.1.3.3. Roof Slope for Replacement Roofing

Replacement roof systems may qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee without correcting poor drainage, though the elimination of ponding (standing water) is strongly recommended.

2.1.3.4. Deck Condition and Suitability for Roofing

The Code having jurisdiction prevails in all cases except where it is exceeded by the requirements published in this Standard.
Notwithstanding the requirements in this Standard, the RoofStar Guarantee does not cover the supporting deck material or its attachment to the building structure, which is the responsibility of the Design Authority and the building contractor.
The supporting deck must be dimensionally stable, resist deflection from dead and live loads, and must be capable of accommodating roof system component movement.
Walls, parapets, curbs, blocking, and penetrations should be constructed or placed by other trades prior to the commencement of roofing work.

2.1.3.5. Drainage Around Obstructions

Curbs that span 2438.4 mm (96") or more when measured perpendicular to roof slope, across the direction of drainage, should be designed with a cricket to divert water around the curb.

2.1.4. Reserved

2.1.5. Roof Decks

2.1.5.1. Steel Roof Decks

(See Note A-2.1.5.1.) (See also Part 9 and Part 10 for substrate preparation requirements)

Steel decks must be acceptable to the manufacturer and must conform to either
1. ASTM Standard Specification A653 / A653M, "Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process": Structural (Physical) Quality, minimum Grade 33, with a design thickness of 22-gauge (0.759 mm) or greater and a minimum zinc coating designation Z275, or
2. ASTM Standard Specification A792 / A792M, "Steel Sheet, Aluminum-Zinc Alloy-Coated by the Hot-Dip Process": General Requirements, minimum Grade 33, with a design thickness of 22-gauge (0.759 mm) or greater and a minimum aluminum-zinc alloy coating designation AZ150.

2.1.5.2. Concrete Roof Decks

(See Note A-2.1.5.2.)

Cast-in-place and precast concrete decks must cure for at least 28 days before receiving an adhered roof membrane ("adhered", as it is used in this requirement, means fully or intermittently bonding any membrane to the deck with an adhesive, hot asphalt (bitumen), or heat), but this limitation may be reduced if
1. both the building envelope engineer and the manufacturer expressly permit membrane application within the first 28 days after pouring, and
2. their respective signed letters of permission are furnished to the Guarantor forthwith, to be included with the project record.
Shotcrete-formed concrete decks are not an acceptable substrate for the application of sheet membranes.

2.1.5.3. All Wood Roof Decks

(See Note A-2.1.5.3.)

Wood decks
1. must conform to the material requirements of the Code (see "British Columbia Building Code", Division B, Part 9, Article 9.23.16.2.. "Material Standards"),
2. shall be free of loose knots or cracks,
3. shall have a moisture content acceptable to the manufacturer (for self-adhered or adhered membranes, moisture content shall not exceed 19%; Ref. Canadian Wood Council, "Moisture and Wood"), and
4. shall be secured to other supporting structural elements of the building in keeping with the published requirements of the Code having jurisdiction; specifying the structural suitability of fasteners is the responsibility of the Design Authority.
Differential edge movements or deflection exceeding 1/360 of the span must be prevented
1. by constructing the deck with tongue-and-groove plywood, and supporting the non-grooved edges with joists or solid blocking, or
2. by supporting butt joints at unsupported edges with solid blocking.
All mass timber decks to which a membrane will be directly applied must be covered with a properly secured, suitable overlay to
1. ensure the integrity of the membrane as mass timber elements contract and expand, and
2. protect membranes from wood sap or deck surface irregularities and protruding fasteners.
Securement of overlaid sheathing shall conform to the requirements for wood decks in this Part.
All types of wood decks should be roofed promptly after installation.

2.1.5.4. Plywood Roof Decks

Plywood panels should conform to CSA 0121, “Douglas Fir Plywood”, CSA 0151, “Canadian Softwood Plywood”, or CSA 0153, “Poplar Plywood”, but in any event must conform to the requirements published in the Code having jurisdiction (See Note A-2.1.5.4.(1)).
All plywood decks (notwithstanding the minimum requirements for plywood used to overlay mass timber and wood board decks; see Article 2.1.5.5., Article 2.1.5.6., and Article 2.1.5.7.) shall be constructed to conform to the "British Columbia Building Code" for either Part 3 or Part 9 buildings, and shall be
1. at least 12.7 mm (1/2”) thick, unless exceeded by the specified securement design (Ref. Part 3, "Securing the Roof Assembly"),
2. free of loose knots and cracks, which are considered defects and must be covered with sheet metal, mechanically fastened in place,
3. securely fastened to roof framing, and installed so that the surface grain (plywood) runs at right angles to the roof framing,
4. properly gapped between panels, and
5. fully supported along all panel edges.
When a plywood deck is intended to support a protected roof system and a Vegetated Roof System,
1. the deck and any vertical planes that contact the vegetated roof system should be pressure-treated tongue-and-groove plywood at least 19.05 mm (3/4”) thick, but when the existing deck and adjoining wall surfaces are untreated wood, they should be overlaid with no less than one layer of an RGC-accepted deck overlay panel listed in Division C of this Manual (See Note A-2.1.5.1. Suitability of Roof Deck in the "RGC Standard for Vegetated Roofs"), and
2. the Design Authority shall be responsible to calculate the anticipated live and dead loads of the system and design suitable approaches to mitigate deflection.

2.1.5.5. Mass Timber Roof Decks

Mass timber decks, which include cross-laminated timbers (CLT), nail-laminated timbers (NLT), dowel-laminated timbers (DLT), and traditional glue-laminated (Glulam) timbers, are acceptable to the Guarantor but must be overlaid with plywood conforming to the material requirements in Article 5.2.1.1.
A mass timber deck that will support a vegetated roof system may be overlaid with a vapour permeable membrane, followed by screw-fastened marine-grade T&G plywood at least 19.05 mm (3/4”) thick, to which the roof system may be applied .

2.1.5.6. Non-veneered Panel Roof Decks

Non-veneered wood decks must be overlaid with plywood and are permissible only with the written consent of the manufacturer, and only when permitted through a written Variance issued by the Guarantor.

2.1.5.7. Wood Board Roof Decks

Wood board decks are not permitted in this Standard.

2.1.6. Reserved

2.1.7. Walls

(See Note A-2.1.7.)

2.1.7.1. General

Wall surfaces must be clean, dry, and smooth, suitable for the application of roof system materials.
Wood or steel-stud walls must be sheathed with a material suitable for adhering membranes and securing metal flashings; when sheathing is unsuitable, it must be overlaid with an accepted wall overlay.
Sheathing is considered a wall surface for the purpose of this Standard.
Wall surfaces suitable for receiving waterproofing materials must extend beyond the maximum installed height of the waterproofing, but in any event must be installed at least 203.2 mm (8”) above the finished roof system surface (For wall overlays, refer to Article 5.2.1.3.).
Indirect connections between walls and roofs require a control joint (See Note A-10.1.6.2.).

2.1.8. Electrical Cables and Boxes

(See Note A-2.1.8. concerning electrical systems, fire and shock hazards, and Rule 12-022 of the Canadian Electrical Code, Part I)

2.1.8.1. New Construction

Electrical cables, raceways or boxes shall not be installed within a roof assembly (Figure 2.1.8.1.-A).
Electrical cables, raceways or boxes shall not be installed on the underside of a roof assembly, unless
1. the supporting deck structure equals or exceeds 76.2 mm (3”) in thickness (Figure 2.1.8.1.-B), or
2. the cables, raceways or boxes are installed and supported so there is a separation of not less than 38.1 mm (1-1/2") measured between the underside of the roof assembly and the electrical installation (Figure 2.1.8.1.-C).
Notwithstanding either (1) and (2), cables or raceways shall be permitted to pass through a roof assembly for connection to electrical equipment installed on the roof, provided that the passage through the roof is a part of the roof assembly design.
Electrical cables installed above the roof assembly should be elevated to permit proper support, roof maintenance and future replacement roofing (Figure 2.1.8.1.-D).

Figure 2.1.8.1.-A Prohibited Installation of Electrical Conduit Forming Part of Sentence 2.1.8.1.(1) (Click to expand)	Figure 2.1.8.1.-B Roof Decks and Electrical Conduit Installation Forming Part of Clause 2.1.8.1.(2)(1) (Click to expand)

Figure 2.1.8.1.-C Minimum Separation Between Roof Assembly and Electrical Conduit Forming Part of Clause 2.1.8.1.(2)(2) (Click to expand)	Figure 2.1.8.1.-D Electrical Conduit Elevated Above Roof Assembly Forming Part of Sentence 2.1.8.1.(4) (Click to expand)

2.1.8.2. Roof Replacement and Alterations

If existing electrical cables or boxes do not conform to the requirements in Article 2.1.8.1., the Design Authority must consider the attachment of the roof system above the electrical system, and the requirements set out in Part 3, "Securing the Roof Assembly".
The Design Authority should
1. specify protection of existing electrical cables and boxes (a 4.76 mm (3/16”) steel plate may be used to minimize the possibility of fastener penetration and cutter damage, but protection plates may interfere with mechanical fasteners used to secure the roof system against wind uplift, even for future replacement roofing), and
2. provide the building owner with detailed as-built drawings that accurately map the location of electrical cables and boxes.

Section 2.2. Materials

2.2.1. Material Properties

2.2.1.1. Sheathing for Framed Walls

Framed wall sheathing must be
1. moisture resistant fibreglass-faced silicon treated gypsum core board, with a minimum thickness of 12.7 mm (1/2”) (These panels are specifically designed to receive roof membranes and may be installed horizontally or vertically).
2. fibre-mat reinforced cement boards with a minimum thickness of 9.53 mm (3/8"), or
3. plywood, having a minimum thickness of 12.7 mm (1/2”).
Where wall sheathing is unsuitable to receive roofing materials, refer to Part 5, "Deck and Wall Overlays".

Section 2.3. Application

2.3.1. Guarantee Term Requirements

2.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

2.3.2. All Systems

2.3.2.1. Construction of Decks and Walls

Unless otherwise permitted and described in this Standard, the construction of deck and wall structures, and their suitability for the application of roofing materials, is the responsibility of other trades.

Part 3 - Securing the Roof Assembly

Click on the gif above to see the full high-definition video, which illustrates why roof system securement requirements matter (NOTE: the video shows a mechanically fastened, conventionally insulated EPDM roof system constructed to the RoofStar Guarantee Standard of the time (2013). The membrane "flutter" in wind is common for this type of roof system).

Section 3.1. Design

3.1.1. General

3.1.1.1. Scope

(See Note A-3.1.1.1.)

The scope of this Part and the Standard shall be as described in Division A, Part 1.
This Part applies to all new roofs, and to both full and partial replacement roof systems.
This Part sets out the requirements for
1. material substitution (applicable to Tested Assemblies),
2. fastener and adhesive application (minimum numbers and spacing),
3. roofs that support overburden, or fixed amenities and equipment, and
4. roofs where only part of the system must be replaced.
Conventionally insulated roof systems designed and constructed with sheet membranes must be secured using
1. a Tested Assembly (a membrane roof system, together with a specified roof deck, tested for its wind resistance capabilities using CSA-A123.21, "Standard test method for the dynamic wind uplift resistance of membrane-roofing systems" (latest edition)(See Note A-3.1.1.1.(4)), or
2. an Assembly with Proven Past Performance (an existing, representative roof system, together with a specified roof deck, which is used as a “proven” pattern for securing a new roof system on the building under consideration; see Article 3.1.4.3.).
When neither of the foregoing options is available to the Design Authority to conform to the Code, the roof system must be secured using a custom engineered design (See Article 3.1.4.4.).

3.1.1.2. Intent

(See Note A-3.1.1.2.)

The requirements in this Part intend to support and conform to or exceed the Building Code.

3.1.1.3. Limit of Liability under RoofStar Guarantee

Notwithstanding Article 3.1.1.2., the materials presented herein are based on an interpretation of the Code and are not the Code itself; therefore, the reader is responsible to exercise good judgement, and to read, understand and comply with the Code, as and how it applies to the reader’s particular project and its design requirements.
Where the Code can be shown to exceed the requirements, guiding principles, and recommendations of this Part or any related Part in this Standard, the Code shall prevail.
Compliance with this Part or the Code does not guarantee that a roof will not succumb to forces exerted by wind, and therefore neither the Guarantor nor the Contractor will accept any responsibility for damage to, or failure of, a roof system caused by wind; too many variables beyond the control of this Standard affect the wind resistance performance of a roof system, including (without limitation)
1. the continuity or discontinuity of air and vapour control layers of the entire building enclosure,
2. openings in the building (windows and doors, which are often occupant-controlled and not static), and
3. wind strength, which may exceed the codified numeric wind speed values used to calculate wind resistance for the roof system (Ref. "British Columbia Building Code 2024", Division B, Appendix C, "Table C-1").

3.1.1.4. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. CSA Standard means the CSA-A123.21, "Standard test method for the dynamic wind uplift resistance of membrane-roofing systems" (latest edition).
2. CSA VRA Standard means the CSA-A123.24, “Standard test method for wind resistance of vegetated roof assembly” .
3. Registered Professional has the same meaning as that used in the "British Columbia Building Code 2024", Division C, Article 2.2.1.2., "Structural Design".
4. Specified Wind Load means the calculated force of wind exerted on the roof of a specific building, according to the requirements in the "British Columbia Building Code 2024", Division B, Part 4, Section 4.1., "Structural Loads and Procedures".
5. System of securement means a specific pattern of mechanical fasteners or adhesives, including specific materials or brands, size, and spacing.

3.1.2. Guarantee Term Requirements

3.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

3.1.2.2. RoofStar 15-Year Guarantee

To qualify for a RoofStar 15-year Guarantee, all projects shall comply with the requirements in this Part for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, and shall
1. comply with the higher securement requirements when enhanced roof system securement is required by the membrane manufacturer, to meet their system warranty requirements ("enhanced securement" may exceed the securement stated or specified in a Tested Assembly, an Assembly with Proven Past Performance, or a custom-engineered design; see also Article 1.1.2.1., "RoofStar 15-Year Guarantee", for further general requirements).

3.1.2.3. RoofStar Vegetated Roof Guarantee

To qualify for a RoofStar Vegetated Roof Guarantee, the supporting roof assembly shall
1. comply with the requirements in this Part for a RoofStar 5-year Guarantee, RoofStar 10-year Guarantee, or a RoofStar 15-year Guarantee,
2. be acceptable to the manufacturer as support for a vegetated roof system, and
3. comply with the related requirements in the “RGC Standard for Vegetated Roofs”.

3.1.3. All Systems

3.1.3.1. Responsibility for Design

The Design Authority is responsible for determining Specified Wind Loads for each roof system and each roof area of a project, including roofs that support Vegetated Roof Systems or any other overburden, amenities, or equipment.
Acceptance of a roof for a RoofStar Guarantee is predicated on the assumption that the Design Authority has performed Due Diligence with respect to Specified Wind Loads and has provided the Contractor with sufficient information to construct a roof system that complies with the Code.

3.1.3.2. Calculation of Specified Wind Loads

A registered professional "skilled in the work concerned" must perform or validate the calculation of Specified Wind Loads (See the "British Columbia Building Code 2024", Division C, Part 2, Article 2.2.1.2., "Structural Design"), using
1. the "Wind Uplift Resistance Calculator" (formerly "Wind-RCI"), or
2. the formulae and procedures in the "British Columbia Building Code 2024", Division B, Part 4, Subsection 4.1.7.,"Wind Load" (See Note A-3.1.1.1.).
Each roof area, at each level (elevation), shall be divided into three principal roof zones ( Figure 3.1.3.2.-A ), and the Design Authority shall be responsible for calculating the Specified Wind Loads for each zone (Ref. the "British Columbia Building Code 2024", Division B, Part 4, Article 4.1.7.6., "External Pressure Coefficients for Low Buildings").
Roof zones are defined in this Standard as follows:
1. Field (F) – the interior of the roof bounded by the Edge and the Corners.
2. Edge (E) – the perimeter zone (minus the corners), measured as either 10% of the smallest building width ("least horizontal dimension"), or 40% of the building height, whichever is less. Notwithstanding the requirements in the "British Columbia Building Code", the Edge zone shall not be less than 2.0 m (7').
3. Corner (C) – part of the perimeter but not less than 2.0 m x 2.0 m (7’ x7’) in size, the Corner area is defined by the Edge in both directions at the corners. Where the roof geometry includes an inside corner, the corner zone dimensions shall be the same as those for an outside corner, applied equidistant in each direction from the inside corner ( Figure 3.1.3.2.-A ).
Figure 3.1.3.2.-A Principal Roof Zones
Forming Part of Article 3.1.3.2.
(Click to expand illustration)
A roof area that is divided into smaller segments by means of control joints (roof dividers, i.e., a fire wall) or expansion joints, shall be considered one roof area for the purpose of calculating the Specified Wind Loads, unless the height of a control joint or expansion joint exceeds 1 m (39"), in which case the Specified Wind Loads for each roof segment shall be calculated separately (See Figure 3.1.3.2.-B ).
When a building is designed with multiple roof levels (at different elevations), and the roofs are adjacent each other (having a common wall), the Specified Wind Loads for each level, and for each roof area on that level, shall be calculated separately from loads for the adjacent level, unless the elevation difference between adjacent roof levels is less than 1.524 m (5’) (See Figure 3.1.3.2.-B ).
When the shape of a single-level roof varies in width or length, the smallest width dimensions shall be used in the calculation of Specified Wind Loads (Ref. “minimum effective width” as defined in the "British Columbia Building Code", Division B, Part 4, Article 4.1.7.2., "Classification of Buildings").

Figure 3.1.3.2.-B Roofs Adjacent to Each Other
Forming Part of Article 3.1.3.2.
(Click to expand illustration)
When a roof area intersects the corner of a wall, the Edge zone on either side of the wall corner must be treated as a roof Corner (2 x C) ( Figure 3.1.3.2.-B ).
When an existing roof system is specified for partial replacement, the Design Authority must
1. calculate the Specified Wind Loads for the roof,
2. determine if securement of the remaining roof components (left in situ) is sufficient to resist the Specified Wind Loads,
3. determine a suitable method of securement or have the system of securement engineered, and
4. calculate and design securement for any overburden, amenities, or equipment.
Roof systems should be designed in conjunction with the electrical systems for the building, to avoid unnecessary interference with roof system securement (See also Subsection 2.1.8., "Electrical Cables and Boxes").
Mansards are a roof system and are therefore subject to the requirements in this Part.
Securement of an adjoining water-shedding system shall be made in accordance with the requirements in the applicable Standard.
Wind loads for a roof assembly supporting a vegetated roof system shall be determined in accordance with the requirements of the Building Code and Resistance to Specified Wind Loads | Article 3.1.3.3.] of the “RGC Standard for Vegetated Roofs”.

3.1.3.3. Resistance to Specified Wind Loads

The wind uplift resistance capabilities of the selected roof system must equal or exceed the Specified Wind Loads calculated for each roof zone to which the system will be applied (see Article 3.1.3.2.).
Engineered designs to resist wind uplift may refer to the "British Columbia Building Code", Div. B, Appendix C, "Table C-2", which lists various types of loads, including wind loads, for specific reference locations throughout the province.

3.1.3.4. Resistance to Other Loads

In addition to its capacity to resist Specified Wind Loads, the roof system must be capable of resisting or accommodating
1. all anticipated live and dead loads, including (without limitation) other environmental loads, such as rain and snow, expected for the building’s size and location,
2. gravity ("drag") loads,
3. loads from overburden (See Part 14), and
4. thermal expansion and contraction of the roof system components.
Where the roof is designed to support a vegetated roof system, consideration for other loads shall conform to the requirements in Article 2.1.4.1. of the “RGC Standard for Vegetated Roofs”.

3.1.3.5. Submittals

The Guarantor must receive from the Contractor, prior to construction of the project and to document the roof system record,
1. a Tested Assembly report supplied or endorsed by a manufacturer, including documentation of the substitution of any materials identified in that test report,
2. a letter in support of an Assembly with Proven Past Performance , as required in Article 3.1.4.3.(2), or
3. a custom-engineered system for securing the roof assembly.

3.1.4. Reserved

3.1.5. Uninsulated Systems

(The requirements in Subsection 3.1.3., "All Systems", shall be read together with the following articles)

3.1.5.1. Securement against Specified Wind Loads

All uninsulated roof systems must be designed to resist displacement by Specified Wind Loads, using the options articulated in Article 3.1.4.1.
Where air intrusion into the roof assembly could compromise its securement, every roof assembly design must provide guidance for the installation of control layers, particularly where control layers intersect roof drains, penetrations, or assemblies adjacent to the roof (i.e., walls) (Ref. Part 6, "Air and Vapour Controls").

3.1.6. Protected Roof Systems

(The requirements in Subsection 3.1.3., "All Systems", shall be read together with the following articles)

3.1.6.1. Securement of Ballasted Roof Systems

(See Note A-3.1.6.1.. Also see Subsection 9.1.6., "Protected Roof Systems")

Roof systems secured with stone (gravel) ballast, pavers, or a combination of each, must be designed to resist displacement by Specified Wind Loads, regardless of any overburden the design may call for.
The securement of all roof systems held in place by ballast must be designed by a registered professional "skilled in the work concerned" ("British Columbia Building Code", Division C, Section 2.2., "Administration"), and ballast rates shall conform to
1. the minimum requirements in Table 3.1.6.1. (Ref. Article 3.3.5.1., "Ballasted Systems", and Subsection 9.3.6., "Protected Roof Systems"), or
2. extrapolated values using ANSI-SPRI RP-4 (latest edition), "Wind Design Standard for Ballasted Single-ply Roofing Systems".
Stone ballast size for all ballasted roof systems shall conform to ASTM D7655/D7655M-12, "Standard Classification for Size of Aggregate Used as Ballast for Membrane Roof Systems".
To facilitate resistance to Specified Wind Loads,
1. a filter fabric is required beneath gravel or paver ballast, and
2. a protection layer is required beneath crushed ballast.
On roofs specified to utilize stone ballast, no fewer than two parallel rows of pavers should be considered for Corner and Edge zones, to prevent or reduce wind scouring of the gravel.
When pavers are selected as ballast for a roof system, the Design Authority must determine the support and placement of pavers to resist displacement by Specified Wind Loads.
Vegetated roof systems designed as ballast for a protected membrane roof assembly shall be designed in accordance with the requirements in Part 3 of the “RGC Standard for Vegetated Roofs”.

Table 3.1.6.1.
Minimum Requirements for Stone Ballast
Forming Part of Article 3.1.6.1.
(Note: these requirements apply only where no other guidance for stone ballast
has been provied by the Design Authority)

XPS Insulation Thickness	Stone Ballast Required Weight	Minimum Ballast Depth (approximate)^†
Up to 50.8 mm (2")	60 Kg/M² (12 lb./sf)	44.45 mm (1-3/4")
76.2 mm (3")	80 Kg/M² (17 lb./sf)	57.15 mm (2-1/4")
101.6 mm (4")	108 Kg/M² (22 lb./sf)	76.2 mm (3")
125 mm (5")	132 Kg/M² (27 lb./sf)	88.9 mm (3-1/2")
152.4 mm (6")	156 Kg/M² (32 lb./sf)	107.95 mm (4-1/4")
177.8 mm (7")	180 Kg/M² (37 lb./sf)	125 mm (5")
203.2 mm (8")	204 Kg/M² (42 lb./sf)	139.7 mm (5-1/2")

^† These minimum requirements should be noted by the registered professional
designing the ballast system.

3.1.6.2. Reserved

3.1.7. Roof Replacement and Alterations

3.1.7.1. Complete Roof System Replacement

Complete roof system replacement projects must be designed to secure the new roof system against displacement by Specified Wind Loads.

3.1.7.2. Partial Roof System Replacement

Partial roof replacements must be designed to secure the roof system against displacement by Specified Wind Loads, in keeping with the requirements in Article 3.1.3.2. (See also Article 3.3.6.2.).
When specifying securement for a partial roof replacement, the securement system must be designed and specified by the Design Authority (See also Subsection 1.1.4., "Replacement and Alterations").

Section 3.2. Materials

3.2.1. Reserved

3.2.2. Securement Materials

3.2.2.1. Fasteners

The minimum requirements in this Article apply to any roof system, regardless of requirements published elsewhere.
The Design Authority should specify the correct type of fastener, keeping in mind
1. pull-out strength, and
2. corrosion resistance (contributing factors to fastener corrosion may include dissimilar metal contact, excessive building humidity, corrosive chemicals within components of the roof system, or corrosive elements provided within the building envelope etc.).
Fasteners must be capable of securing the roof system components to resist Specified Wind Loads.
Unless otherwise permitted in writing by the manufacturer, fasteners shall be resin-coated, self-drilling screws manufactured with recessed heads, and must be used in combination with plates, as shown in Table 3.2.2.1.

Table 3.2.2.1.
Minimum Fastener and Plate Requirements
Forming Part of Article 3.2.2.1.
(Note: these requirements apply only where no other guidance for fastener and plate types and sizes has been provided by the Design Authority)

Material	Fastener Size	Plate
Deck overlays	#12	73.03 mm (2-7/8”) Hexagonal, 76.2 mm (3”) Round or Square
Insulation	#12	73.03 mm (2-7/8”) Hexagonal, 76.2 mm (3”) Round or Square
Insulation Overlays	#12	73.03 mm (2-7/8”) Hexagonal, 76.2 mm (3”) Round or Square
Membranes	#14	Proprietary

3.2.2.2. Adhesives

Adhesives used to secure any roof system materials must be acceptable to the manufacturer and be capable of resisting Specified Wind Loads.

3.2.2.3. Gravel Ballast

(See also Table 3.1.6.1. in Article 3.1.6.1.)

Stone (gravel) ballast used to secure a roof system must be washed (clean) round or crushed stone and must conform to ASTM D7655/D7655M-12, "Standard Classification for Size of Aggregate Used as Ballast for Membrane Roof Systems", or to Table 3.3.
The minimum requirements in this Article must not be reduced except by a written Variance that shall be endorsed in writing by the owner or the owner's representative, and submitted to the RoofStar Guarantee Program as part of the Guarantee record.

Table 3.2.2.3.
Stone Ballast Size and Grades
Forming Part of Article 3.2.2.3.

Nominal size	Percentage Passing
38.1 mm (1-1/2")	100%
25.4 mm (1")	70 - 100%
19.05 mm (3/4")	5 - 20 %
12.7 mm (1/2")	0 - 6 %
4.76 mm (3/16")	0 - 2 %

3.2.2.4. Pavers and Pedestals

Pavers that are partially supported (i.e., with pedestals) should be capable of resisting anticipated loads (i.e., hydraulically pressed concrete pavers).
Pedestals
1. should be adjustable when a level surface is required,
2. must be purpose-made, and
3. must include an integral spacer rib measuring at least a 3mm (⅛”) in width, to uniformly separate pavers.

Section 3.3. Application

3.3.1. Guarantee Term Requirements

3.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

3.3.2. All Systems

3.3.2.1. Reserved

3.3.2.2. Reserved

3.3.2.3. Securing Roofs with Overburden

Any overburden, including vegetated roof systems, must be installed in keeping with the designed securement methods and systems specified by the Design Authority, and shall also conform to the the requirements in Part 14 .

3.3.3. Reserved

3.3.4. Uninsulated Systems

(The requirements in Subsection 3.3.2., "All Systems", shall be read together with the following articles)

3.3.4.1. General Requirements

All uninsulated roof systems that are not secured with ballast shall conform to the requirements in Article 3.1.4.1. for conventionally insulated systems.
Uninsulated roof systems secured with stone ballast, pavers or both must be installed following the requirements in Article 3.3.5.1.

3.3.5. Protected Roof Systems

(The requirements in Subsection 3.3.2., "All Systems", shall be read together with the following articles)

3.3.5.1. Ballasted Systems

(Note: the reader must consult the Design and Application requirements for protected roof systems in Part 9).

Roof systems secured with stone ballast, pavers, or both must be constructed to resist displacement by Specified Wind Loads.
To facilitate resistance to Specified Wind Loads,
1. a filter fabric is required beneath stone or paver ballast,
2. a protection layer is required beneath crushed ballast, and
3. stone ballast must conform to the specified design.
Stone ballast shall
1. be washed (clean) round or crushed material , and
2. be selected (according to the specified design) to resist flotation and Specified Wind Loads.
Pavers and unit-type masonry, such as brick or paving stones , must be supported by
1. purpose-made pedestals conforming to the requirements in Article 3.2.2.4.,
2. a proprietary drainage layer overlaid with a filter fabric mat, or
3. a drainage layer of loose aggregate (such as pea gravel) measuring at least 25.4 mm (1”) in depth, installed over a filter fabric.
Pedestals
1. must permit at least 12.7 mm (1/2″) of vertical separation between the paver and the underlying substrate, to provide airflow for drying surfaces and assist in leveling,
2. should not impede the flow of water or air, and
3. should uniformly distribute the dead load of pavers, and other unit masonry products, as well as predicted live loads.
Pavers must be tied together when specified by the design.
When a vegetated roof system is used as ballast, the installation shall conform to Part 10 of the “RGC Standard for Vegetated Roofs” (See also Part 3 in the same Standard, concerning design requirements).

3.3.6. Roof Replacement and Alterations

3.3.6.1. Complete Roof System Replacement

Roof systems that are removed and replaced in their entirety (excluding the air or vapour controls, which may be left in place at the discretion of the Design Authority) must be secured following the requirements for new roof systems.

3.3.6.2. Reserved

Part 4 - Materials

Section 4.1. Design

4.1.1. General

4.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

4.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Primary Material means a material used in a roof or grade-level waterproofing system that protects a building interior from water. Primary materials are often exposed to the weather (protected membranes are an exception), and therefore also protect secondary materials from damage. Membranes, metal panels, asphalt shingles, and cedar shakes and shingles, form the core body of materials classified as primary.
2. Secondary Material means one which forms part of a waterproofing system or water-shedding system, and which may affect the wind resistance characteristics of the entire assembly but is not necessarily exposed to the weather.

Section 4.2. Materials

4.2.1. Material Properties

4.2.1.1. Use of Accepted Materials

(For limitations and exclusions pertaining to materials, see Division A, Article 3.2.1.2.)

All materials installed by the Contractor, for new construction or alterations, must be
1. newly manufactured (except for reusable insulation; see Article 7.1.3.2.), and may not be recycled without the expressed, written consent of the Guarantor,
2. accepted by the RoofStar Guarantee Program, and
3. manufactured by, or listed as acceptable to, the manufacturer of the primary material.
All uninstalled materials must be
1. protected from weather with wrappers approved or recommended by the manufacturer,
2. properly stacked, and
3. secured above ground or on the roof surface.
All installed roofing materials that are susceptible to moisture damage must be made watertight by the end of each workday.
Metals and fasteners must be compatible with each other, to avoid galvanic corrosion which can occur when dissimilar metals contact each other.

Section 4.3. Application

4.3.1. Guarantee Term Requirements

4.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

4.3.2. All Systems

4.3.2.1. Application of New Materials

All new materials installed as part of the roof system shall conform to the manufacturer's published requirements, unless superseded by this Standard.

Part 5 - Deck and Wall Overlays

(See Note A-5)

Section 5.1. Design

5.1.1. General

5.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

5.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary.

5.1.2. Guarantee Term Requirements

5.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

5.1.3. All Systems

5.1.3.1. Required Use of Overlays

(See Note A-5.1.3.1.; see also Part 9 and Part 10 for substrate preparation requirements)

A deck or wall overlay must be specified when
1. a thermal layer is required by the Building Code, or
2. the conditions of the deck or wall are unsuitable for receiving roofing materials.
When a roof design includes any type of overburden, the deck overlay on steel decks, or on wood decks less than 25.4 mm (1”) thick, should be at least 15.88 mm (5/8”) thick, to stiffen the supporting surface and reduce deck deflection.

Section 5.2. Materials

(See Division C, "Accepted Materials")

5.2.1. Material Properties

5.2.1.1. Suitability of Overlays

Deck and wall overlays must be
1. listed in Division C,
2. acceptable to the manufacturer,
3. suitable for the type of deck, and
4. suitable for, and compatible with, any membrane or panel application.
When plywood is used as a deck overlay, only tongue-and-groove plywood is acceptable and must be
1. at least 12.7 mm (1/2”) thick when installed over a mass timber deck, or
2. at least 15.88 mm (5/8”) thick, when the roof supports overburden.

5.2.1.2. Thermal Barrier

When the Code having jurisdiction requires a thermal barrier, any material selected from Division C must be suitable for the purpose.

5.2.1.3. Overlays for Walls

In addition to overlays listed in Division C, walls may be overlaid with
1. plywood, provided the plywood is least 12.7 mm (1/2”) thick and is pressure-treated when applied over concrete or concrete masonry units (CMU), or
2. fibre-mat reinforced cement boards with a minimum thickness of 9.53 mm (3/8"), conforming to ASTM C1325 (latest edition), "Standard Specification for Fiber-Mat Reinforced Cementitious Backer Units".

5.2.1.4. Fasteners

Refer to Article 3.2.2.1.

Section 5.3. Application

(This Section shall be read in conjunction with the requirements for substrate preparation in Part 9 and Part 10)

5.3.1. Guarantee Term Requirements

5.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

5.3.2. All Systems

5.3.2.1. Support, Arrangement, and Securement of Deck Overlays

Deck overlays must be
1. fully or intermittently supported along all edges by the deck, and
2. installed in a staggered pattern (offset) 304.8 mm (12") from adjacent board rows (a minus offset tolerance of 50.8 mm (2") maximum will be permitted to compensate for variance in the manufacturer's tolerance of differing board widths and lengths).
Deck overlays shall be affixed to the deck with
1. mechanical fasteners conforming to the requirements in Article 3.2.2.1.,
2. polyurethane foam adhesives acceptable to the manufacturer and conforming to the requirements in Article 3.2.2.2., or
3. a combination of mechanical fasteners and polyurethane foam adhesives.
When mechanical fasteners are used to secure deck overlays, the minimum number of fasteners (in combination with plates) shall be
1. four (4), for every 1219.2 mm x 2438.4 mm (48" x 96") sheet, unless exceeded by the specified design.

5.3.2.2. Overlays on Steel Decks

Steel deck panels must be overlaid with a suitable substrate to provide a smooth, uniform surface for roofing.
RoofStar-accepted deck overlay boards used as a thermal barrier to achieve a specific fire rating must conform to the applicable code and insurance requirements for the roof system.
When the roof system is uninsulated, the deck must be overlaid with at least one 12.7 mm (1/2”) thick layer of
1. moisture resistant gypsum core deck overlay board, or
2. plywood.

5.3.2.3. Overlays on Concrete Decks

A deck overlay board is not mandatory on a concrete supporting deck, but when it is specified, it must be installed to conform to the requirements in this Part.

5.3.2.4. Overlays on Wood Decks

A mechanically fastened overlay board is required for any deck structure that does not meet the deck fastening criteria set out in Article 2.1.5.3..

5.3.2.5. Support, Arrangement, and Securement of Wall Overlays

Wall overlay panels must be
1. mechanically fastened with screw fasteners spaced no more than 304.8 mm (12”) O.C., both vertically and horizontally; fasteners must align with structural supports, and shall be placed
  1. at the perimeters,
  2. at the corners, and
  3. in the field, or
2. adhered with a polyurethane adhesive, applied with a continuous z-patterned ribbon spaced no less than 304.8 mm (12”) apart.

Part 6 - Air and Vapour Controls

(See Note A-6)

Section 6.1. Design

6.1.1 General

6.1.1.1. Scope

(See Note A-6.1.1.1.)

The scope of this Part and the Standard shall be as described in Division A, Part 1.

6.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Air barrier means a material that is manufactured and tested to prohibit the passage of air through that material.
2. Continuity means a sealed, resistive, continuous connection
  1. between control layers that have the same function, and
  2. between a control layer and another material or object it joins to (i.e., a roof drain or penetration).
3. Control layer means a material used in a roof assembly or wall assembly, that is manufactured and tested to resist or control the movement of air, vapour, or liquid water into or through that assembly.
4. Vapour retarder means a material that is manufactured and tested to prohibit or regulate the passage of water vapour through that material.
5. Water resistive barrier (WRB) means a material that is manufactured and tested to resist the transmission of liquid water through the material, and is usually used in wall assemblies.

6.1.2. Guarantee Term Requirements

6.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

6.1.3. All Systems

6.1.3.1. Responsibility for Design

The Design Authority is responsible to specify
1. air and vapour control materials,
2. the placement of continuous air and vapour control layers in relation to a roof system and its components, and
3. the selection of suitable materials for that application (See Note A-6.1.3.1.).
The Design Authority is urged to review and consider the performance characteristics of materials available for such applications.
Coverage under the RoofStar Guarantee shall be as described in Division A, Article 3.2.1.2..
Notwithstanding coverage provisions in Division A, neither the RoofStar Guarantee Program nor the Contractor will accept any responsibility for damage to, or failure of, the roof system caused by the use or absence of air or vapour control layers.

6.1.3.2. Continuity of Control Layers

The Design Authority, and trades constructing walls and roofs, are jointly responsible for making proper connections (continuity) between air and vapour control systems, including the transitions between wall systems and roof systems.
Where air, vapour, or water control layers intersect a roof drain, overflow drain, scupper drain, or penetration, the intersection must be designed for continuity, and drawings must detail the execution of continuity for the Contractor.
Overflow drains and scupper drains that penetrate wall assemblies must be designed and drawn to prevent air intrusion from the outside environment (Ref. Article 3.1.5.1.).

6.1.3.3. Use of Air Control Materials

The Design Authority is responsible for the selection of air control materials (some air control layers are considered vapour permeable, others vapour-impermeable); roof systems intended to qualify for a RoofStar Guarantee should be designed according to the regulatory design and installation requirements for effective, continuous air control systems.
All materials selected by the Design Authority should conform to the material and performance characteristics required in the "British Columbia Building Code", Division B, Article 5.4.1.2., "Air Barrier System Properties".

6.1.3.4. Use of Vapour Control Materials

Because continuous vapour control layers may be needed to limit “water vapour transmission and condensation, burn protection, and severe climatic conditions” (National Energy Code of Canada for Buildings 2020, Article 5.2.5.3.(1), "Other Considerations"; see also the "British Columbia Building Code", Division B, Article 5.5.1.1., "Required Resistance to Vapour Diffusion"), they are considered discretionary and must be specified by the Design Authority.
Where continuous vapour control layers are required and specified by Code, the RoofStar Guarantee Program requires that a suitable vapour control system be selected by the Design Authority and properly installed by the Contractor in conformity with the vapour control layer manufacturer’s published instructions, and with the Design Authority’s specified details.

6.1.3.5. High-humidity Building Interiors

Careful consideration should be given to the performance characteristics of air and vapour control layers when specifying such a membrane for roof systems constructed over high-humidity building interiors, which may be susceptible to the accumulation of moisture within the roof system unless effective air and vapour controls are installed; these building interiors include (but are not limited to)
1. swimming pools,
2. commercial laundry facilities,
3. large aquariums, and
4. paper mills.

6.1.3.6. Reserved

Section 6.2. Materials

6.2.1. Material Properties

6.2.1.1. Compatibility with Other Materials

The material selected for air and vapour control layers must be compatible with any other materials in the roof or wall assembly to which the control layer may come in contact, including (without limitation) contact with primers and adhesives, substrates, solvents, and cleaners.

6.2.1.2. Permitted Materials for RoofStar Guarantee

(See Note A-6.2.1.2.)

While responsibility for the selection of suitable air and vapour control layers rests with the Design Authority, a roof designed and built to qualify for a RoofStar Guarantee shall not include
1. polyethylene sheet plastic, or
2. bitumen-impregnated kraft paper.

6.2.1.3. Puncture Resistance and Thickness

Air and vapour controls should be installed over a continuous smooth plane, regardless of a material's ability to span voids or spaces in the deck.
Fully supported air and vapour control layers should possess a minimum published static puncture resistance rating of 150 N (34 lbf) (Ref. CGSB-37.56-M for both test method and standard limits) and be either self-adhering or torch-applied; a high puncture resistance is necessary for the membrane to withstand accidental damage during construction.
Where no deck overlay board is installed and the air and vapour control layers are partially unsupported (for example, on a steel deck), the control layers must possess a published static puncture resistance of at least 400 N (90 lbf).
Should the air or vapour control layers be used as a temporary roof during project construction by either the Contractor or by other trades, a minimum 2 mm thick bituminous membrane is recommended.

6.2.1.4. Self-adhered and Torch-applied Materials

Self-adhering or adhesive-applied materials should be considered as alternatives to torch-applied membranes when the substrate to which they will be applied is combustible, or when nearby structures, openings or materials present a fire hazard.
A suitable separation or overlay material may be used as protection from open flame is acceptable; the application of materials to a combustible surface, using a torch, is strictly prohibited.

6.2.1.5. Reserved

Section 6.3. Application

6.3.1. Guarantee Term Requirements

6.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

6.3.2. All Systems

6.3.2.1. Continuity and Support

The Contractor must
1. ensure that air and vapour control layers in the roof system field, and at perimeters, are installed to provide at least 101.6 mm (4”) of overlap, for continuity of matching layers in adjacent assemblies,
2. ensure that air and vapour control layers are sealed to penetrations and drains that pass through or enter the roof assembly, and
3. seal all control layers to matching layers in adjacent assemblies (i.e., walls), when a roof is replaced.
Installation of all air and vapour control materials must be smooth and uniform, without wrinkles or fish-mouths, and must also conform to the manufacturer’s published requirements and the Design Authority’s design details.
All air and vapour control membrane side and end laps must be fully supported, in the field and at transitions with curbs, parapets, walls, and penetrations.
Roof drains, overflow drains, scupper drains, and penetrations must be detailed where they intersect an air, vapour, or water control layer, to provide continuity.

6.3.2.2. Torch-applied Materials

The application of materials to an unprotected combustible material, using a torch, is strictly prohibited.
All combustible materials MUST be protected from open flame by an acceptable separation or overlay material; this includes, without limitation, combustible materials
1. on decks, walls, blocking, and canted edges, and
2. that are hidden or obscured within voids, cracks, or orifices.
When a torch-applied membrane is specified over combustible materials, all joints between overlay panels, and at roof-wall transitions, must be sealed with the primary membrane manufacturer’s approved self-adhered membrane or tapes.
Where torch-applied membranes are not permitted or desirable, the installation of bituminous air and vapour control layers should align with the approaches described and required in the "Standard for SBS-modified Bitumen Membrane Roof Systems", Subsection 10.3.8., "Alternative Approaches to Sheet Membrane Flashing".

6.3.2.3. Securement on Slopes

Self-adhered membranes applied to slopes greater than 1:6 (2” in 12”) should be additionally secured with mechanical fasteners in locations where slippage may occur, to counter-act material displacement resulting from temperatures that exceed the membrane’s service temperature.

Figure 6.3.2.1.-A Air, Vapour Controls Over Steel Deck With Metal Support Forming Part of Sentence 6.3.2.1.(5) (Click to expand illustration)	Figure 6.3.2.1.-B Air, Vapour Controls Over Steel Deck With Deck Overlay Panel Forming Part of Sentence 6.3.2.1.(5) (Click to expand illustration)

6.3.2.4. Reserved

Part 7 - Insulation

Section 7.1. Design

7.1.1. General

7.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

7.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Heat-resistant insulation means insulation that resists heat and will not physically or chemically change when exposed to heat greater than 70°C (158°F), including heat from liquefied bitumen. Insulation boards of this type include fibreboard, polyisocyanurate, and mineral fibre ("wool"). Note that "heat-resistant" does not mean or even infer 'fire-proof'. While some heat-resistant insulation materials will resist burning for a time, only mineral fibre insulation will not burn.
2. Heat-sensitive insulation means insulation that may be physically or chemically altered when exposed to heat greater than 70°C (158°F) — for example, heat from a torch or from liquefied bitumen. Heat-sensitive insulation includes EPS, XPS and polyurethane.

7.1.2. Guarantee Term Requirements

7.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

7.1.2.2. Reserved

7.1.2.3. RoofStar Vegetated Roof Guarantee

To qualify for a RoofStar Vegetated Roof Guarantee, the supporting roof assembly shall
1. comply with the requirements in this Part for a RoofStar 5-year Guarantee, RoofStar 10-year Guarantee, or a RoofStar 15-year Guarantee,
2. be acceptable to the manufacturer as support for a vegetated roof system, and
3. comply with the related requirements in the “RGC Standard for Vegetated Roofs”.

7.1.3. All Systems

7.1.3.1. Responsibility for Design

(See Note A-7.1.3.1.)

The Design Authority is responsible to ensure the design conforms to the Building Code and any other applicable requirements, with respect to
1. the use of a thermal barrier between the roof deck and the insulation system, and
2. the minimum required thermal resistance of the insulation system.

7.1.3.2. General Requirements

Selected board insulation products may be used within the membrane roof systems, provided the panels are listed in Division C, and conform to the material specifications in Section 7.2.

7.1.3.3. Use of Existing Insulation

Existing insulation on a roof may be reused (it will be excluded from coverage under the Guarantee, which applies only to new materials), provided
1. the Design Authority has specified its reuse, and
2. the condition of the insulation is acceptable to the Design Authority as suitable to satisfy the requirements of the Building Code.

7.1.3.4. Effective Thermal Resistance and Layering

(See Note A-7.1.3.4.)

All insulated roofs with a cumulative thermal resistance greater than RSI-2.64 (R-15) (based on published LTTR values measured at 24°C) must be installed in multiple layers that are offset and staggered (See Section 7.3., "Application").
In a multi-layered assembly, any single layer of insulation may have a thermal resistance greater than RSI-2.64 (R-15) provided no one layer exceeds 60% of the cumulative thermal resistance of the combined assembly of insulation, measured together with the thermal resistance of insulation overlay boards (See Figure 7.1.3.4.-A).
At intersections with insulated curbs and walls, insulation joints at the roof-wall interface must be offset and staggered to minimize or eliminate thermal bridging (See Figure 7.3.2.2.-A) .

Figure 7.1.3.4.-A Effective Thermal Resistance and Layering
Forming Part of Sentence 7.1.3.4.(2)
(Click to expand illustration)

7.1.4. Reserved

7.1.5. Reserved

7.1.6. Protected Roof Systems

(The requirements in Subsection 7.1.3., "All Systems", shall be read together with the following articles)

7.1.6.1. Insulation Selection

Only extruded polystyrene insulation (XPS) may be specified for a protected roof system.

7.1.6.2. Drainage Mats and Filter Fabric

At least one drainage layer is required in a protected membrane roof system, either above or below the XPS insulation, but
1. when openings in walls or roof penetrations provide less than 203.2 mm (8”) of clearance, the filtration layer must be water-permeable and the drainage layer shall be below the XPS insulation, to lower the drainage plane and minimize leaks into the building, and
2. a drainage layer shall be specified above the XPS insulation when any overburden superimposed on the roof system will result in a “vapour-closed” condition (i.e., a vegetated roof system or an impermeable wearing course) .
Subject to the conditions in Sentence (1), a drainage layer below the XPS insulation in a vegetated roof assembly may be omitted (Sentence 6.1.3.1.(5), “RGC Standard for Vegetated Roofs”).
Filter fabric must be specified to cover XPS insulation, to
1. contain the insulation and thereby prevent ‘insulation stacking’ (displacement) when insulation boards become buoyant in water, and
2. prevent fines from settling at the membrane level and filling the voids between insulation board joints.

Section 7.2. Materials

(See Division C, "Accepted Materials")

7.2.1. Material Properties

7.2.1.1. General

Only insulation boards accepted for use in the RoofStar Guarantee Program, and acceptable to the membrane manufacturer, may be used to qualify for a RoofStar Guarantee.

7.2.1.2. Material Dimensions

While minimal insulation panel thicknesses are permissible for some designs, some materials are by their nature breakable, and therefore the Design Authority should consider the constructability of the roof system from a material handling perspective and consider specifying a thicker panel.

7.2.1.3. Drainage Mats

Drainage mats used in protected membrane roof assemblies, or used where overburden superimposed on the roof assembly requires an additional drainage layer, shall conform to the requirements in Article 14.2.1.4.
Drainage mats that form part of a vegetated roof assembly shall conform to the requirements in Article 6.2.1.2. of the “RGC Standard for Vegetated Roofs”.

7.2.1.4. Filter Fabric

Filter fabrics for protected membrane roof assemblies shall conform to the requirements in Article 14.2.1.6..

7.2.2. Suitability of Insulation

7.2.2.1. Extruded Polystyrene Insulation

Insulation boards
1. must be clean, and dry to the touch ,
2. must be firmly supported,
3. should be square and should make firm, full contact with adjacent panels,
4. must be installed with the appropriate grade of expanding spray foam applied to gaps greater than 6.35 mm (1/4”) (this requirement does not apply to extruded polystyrene (XPS) installed in a protected roof system), and
5. shall not be soldiered and must be laterally offset at least 304.8 mm (12") in two directions , both for adjacent layers and for adjacent row; a minus offset tolerance of 50.8 mm (2") maximum is permissible (See Figure 7.3.2.2.-A ).
Offsets are not required for
1. sloped insulation boards that are generally installed soldiered fashion to adjacent rows, and
2. the first layer of overlay board, installed on top of heat-sensitive insulation, which may be soldiered to facilitate joint taping.
Figure 7.3.2.2.-A Offset and Staggered Layering in Field
Forming Part of Clause 7.3.2.2.(1)(4)
(Click to expand illustration)
On exterior insulated walls, insulation joints at the roof-wall interface must be offset and staggered to eliminate thermal bridging (See Figure 7.3.2.2.-B ).

Figure 7.3.2.2.-B Offset and Staggered Layering at Wall
Forming Part of Clause 7.3.2.2.(3)
(Click to expand illustration)

7.3.2.3. Insulation Securement

Insulation securement shall conform to the specified design for the roof assembly, calculated to resist the Specified Wind Loads for the roof system.

7.3.2.4. Reserved

7.3.3. Reserved

7.3.4. Reserved

7.3.5. Protected Roof Systems

(The requirements in Subsection 7.3.2., "All Systems", shall be read together with the following articles)

7.3.5.1. Sequencing of Work

Insulation installed against walls or curbs must be separated from roof membranes with a non-bonding drainage mat or slip sheet.
Insulation must be secured and protected immediately after installation.

7.3.5.2. Drainage Mats

(See also Part 11, "Drainage")

At least one drainage layer is required in a protected membrane roof system and its location within the system shall conform to the design requirements in Sentence 7.1.6.2.(1) .
A drainage mat must be installed below the XPS insulation.
A second drainage layer may be installed above the insulation but is at the discretion of the Design Authority.
If a second drainage layer is specified, a vertical separation space measuring at least 12.7 mm (1/2″) must be preserved between the drainage layer and any ballast or overburden, to permit airflow and to assist in leveling.
Specialized proprietary drainage products must be acceptable to the membrane manufacturer.
Ballast guards must be installed around all roof drains.

7.3.5.3. Filter Fabric

Fabric filter mats must be
1. installed loose-laid (un-bonded) over the insulation and below any type of ballast or roof covering,
2. overlapped at all edges a minimum of 304.8 mm (12”),
3. at least 2438.4 mm x 2438.4 mm (96" x 96") in size, and
4. slit to fit over roof penetrations or cut out around roof drains and other openings.
Filter fabric must extend up perimeter edges and curbs and must be placed loose (unattached) under metal counter flashings or wall finishes.
When the filtration layer is part of a vegetated roof assembly, the filtration layer shall conform to Article 10.3.2.7. of the “RGC Standard for Vegetated Roofs”.

Part 8 - Reserved

Part 9 - Roof Field (Membrane Systems)

Section 9.1. Design

9.1.1. General

9.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

9.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Manufacturer means the manufacturer of the primary roof covering, unless stated otherwise.
2. Parallel to Slope means the direction parallel to the angle of a sloped plane.

9.1.2. Guarantee Term Requirements

9.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

9.1.2.2. Reserved

9.1.2.3. RoofStar Vegetated Roof Guarantee

To qualify for a RoofStar Vegetated Roof Guarantee, the supporting roof assembly shall
1. comply with the requirements in this Part for a RoofStar 5-year Guarantee, RoofStar 10-year Guarantee, or a RoofStar 15-year Guarantee,
2. be acceptable to the manufacturer as support for a vegetated roof system (with consideration to added hydrostatic pressure – see Article 1.1.4.1.] in the “RGC Standard for Vegetated Roofs”), and
3. comply with the related requirements in the “RGC Standard for Vegetated Roofs”.

9.1.3. All Systems

9.1.3.1. General Requirements

Construction sequencing of "hot fluid-applied rubberized asphalt roof systems" begins with perimeters and penetrations, and therefore this Part must be read together with the requirements in Part 10, "Perimeters and Walls", Part 11, "Drainage", and with Part 12, "Penetrations and Curbs".
Specifications, details, and installation techniques must conform to the membrane manufacturer's requirements.
Hot fluid-applied rubberized asphalt membranes
1. are suitable only for protected roof systems,
2. must be specified for installation on an acceptable supporting deck structure and, if so required, over a deck overlay that is properly secured to the deck,
3. must consist of no fewer than two (2) coats, reinforced between the coats with the manufacturer’s proprietary reinforcement material, and
4. must be specified to include protection materials accepted by the Guarantor and listed by the manufacturer as suitable for the purpose.
All deck joints, minor cracks and deck overlay joints must be prepared to receive the primary membrane; refer to Article 9.3.2.3. for application requirements.
When a roof system installed on a concrete deck or concrete topping is uninsulated, the concrete must be prepared with primer, when specified by the manufacturer.
Membranes may not be adhered to lightweight insulation concrete unless expressly permitted by the manufacturer.

9.1.3.2. Control Joints (Roof Dividers)

When control joints (roof dividers) are recommended or required by the manufacturer, or are deemed necessary by the Design Authority, they must be designed following the requirements in Article 10.1.6.2.

9.1.3.3. Securement

The roof system must be secured to resist displacement by Specified Wind Loads, and therefore the requirements in this Article shall be read together with the requirements in Part 3 of this Standard.

9.1.3.4. Membrane Protection

The design must specify immediate protection of a newly installed, fully reinforced membrane, using materials specified or deemed suitable by the manufacturer.
Installed membranes must be protected from damage caused by
1. any walkway surface,
2. work performed concurrently or subsequently by other trades (the Design Authority is strongly urged to direct the work of other trades through specific, explicit directives in the design specifications), and
3. chemicals or other contaminants that may adversely impact the roof membrane or other system components, including (without limitation)
  1. animal or vegetable grease,
  2. hot pipes (release valves),
  3. petroleum products or bi-products, and
  4. miscellaneous fluids from equipment, detrimental to the membrane.

9.1.3.5. Walkways

The membrane must be suitably protected from mechanical damage by walkway surfaces.
Paver walkway surfaces must be suitably supported in keeping with Article 14.1.3.11. and Article 14.3.2.5., "Wearing Surfaces".

9.1.4. Reserved

9.1.5. Uninsulated Systems

(The requirements in Subsection 9.1.3., "All Systems", shall be read together with the following articles)

9.1.5.1. General Requirements

The installed membrane must be immediately protected with materials specified or deemed suitable by the manufacturer.

9.1.6. Protected Roof Systems

(The requirements in Subsection 9.1.3., "All Systems", shall be read together with the following articles)

9.1.6.1. General Requirements

Ballasted systems shall conform to the requirements in Article 3.3.5.1. and Article 9.1.3.3.

Section 9.2. Materials

(See Division C, "Accepted Materials")

9.2.1. Material Properties

9.2.1.1. Membrane Composition, Thickness, and Selection

Hot fluid-applied rubberized asphalt membranes must be selected from the list of accepted materials published in Division C of this Manual, and must conform to
1. CAN/CGSB-37.50-M89, and
2. acceptance criteria published in this Manual.
Field membrane reinforcement scrim must be a spun-bonded polyester fabric weighing no less than 30 g/m2 (1.3 oz/yard2).

9.2.1.2. Reserved

9.2.1.3. Protection Materials

Materials used to protect the primary membrane must be acceptable to and specified by the manufacturer.
Asphaltic core boards must be at least 3.78 mm (1/8") thick and conforming to CSA-A123.25.
SBS-modified bituminous sheet membranes must be
1. reinforced with a non-woven polyester scrim no less than 180g/m2, or with a composite scrim of equal puncture resistance,
2. no less than 2.0 mm (80 mils) thick, when measured in the middle of the membrane sheet, and
3. sanded on the underside.

9.2.2. Materials Storage and Handling

9.2.2.1. Protection from the Weather

All uninstalled materials must be protected from weather by properly stacking them above ground, or above the roof surface, in or beneath covers that are weather-resistant and secured against displacement by wind (See also Article 4.2.1.1., "Use of Accepted Materials").

9.2.3. Accessories

9.2.3.1. Accessories Supplied by Membrane Manufacturer

All membrane accessory components must be supplied by and acceptable to the manufacturer.

Section 9.3. Application

9.3.1. Guarantee Term Requirements

9.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

9.3.2. All Systems

9.3.2.1. Preparation of Substrate

All supporting decks must be acceptable to the manufacturer and must be
1. made suitable for roofing by others (trades other than the Contractor),
2. dimensionally stable,
3. structurally sound,
4. capable of accommodating roof system component movement,
5. clean,
6. adequately dry and frost-free (Ref. Subsection 2.1.5., "Roof Decks"),
7. reasonably smooth and free of abrupt elevation changes, and
8. absolutely free of
  1. dust,
  2. dirt,
  3. voids,
  4. open cracks,
  5. sharp projections,
  6. contaminants,
  7. objectionable surface treatments,
  8. laitance (concrete must be “native”),
  9. oil, and
  10. grease
Joints and cracks in a deck, or between overlay panels, must be flashed before the membrane is installed; flashing materials shall be
1. acceptable to the manufacturer,
2. centered over the crack or joint,
3. at least 152.4 mm (6”) wide,
4. embedded in a base coat of warm membrane at least 3.2 mm (125 mils) thick,
5. overlapped with adjoining reinforcement materials by at least 25.4 mm (1”),
6. covered with a second (top) coat of hot membrane at least 3.2 mm (125 mils) thick, and
7. fully integrated with the primary membrane system.
A properly secured, accepted overlay board is required (ref. Part 5)
1. for any deck that does not meet the deck fastening criteria set out in Article 2.1.5.3.,
2. for any deck that cannot be repaired or otherwise made suitable for roofing, and
3. for mass timber decks (plywood overlay shall conform to the requirements in Article 5.2.1.1.
Substrates must be primed, if required by the manufacturer.
All plane transitions must be prepared or reinforced in the manner specified by the manufacturer.
1. must cure at least 28 days before receiving adhered membranes, but this limitation may be reduced if both the building envelope engineer and the manufacturer expressly permit membrane application within the first 28 days after pouring, and their respective signed letters of permission are furnished to the Guarantor forthwith, to be included with the project record ("adhered", as used in this requirement, means fully or intermittently bonding any membrane to the deck with an adhesive, hot asphalt (bitumen), or heat),
2. must be finished by others to render a surface profile range suitable to the membrane manufacturer, to facilitate a ‘mechanical bond’ between the substrate and the membrane, and
3. constructed with pre-cast panels must be made continuous and even; all side and end-joints must be filled and reinforced according to the manufacturer’s published requirements.
Plywood decks with cracks or loose knots must be filled or overlaid with plywood (see Article 5.2.1.1.).
Joints between plywood deck panels must be prepared and reinforced according to the manufacturer’s published requirements.
If surface drying is required prior to roofing, the deck must be dried with blown air.

9.3.2.2. Preparation of Roofing Materials

Primary membrane product cakes must be
1. heated in a double-jacketed oil bath or hot-air melter to a temperature specified by the manufacturer, and shall not be heated beyond the specified maximum,
2. maintained at a safe operating temperature, established by the manufacturer, and
3. continually agitated until installed; avoid heating and agitating the same material for more than six hours.

9.3.2.3. General Requirements for Membrane Application

The requirements in this Part must be applied simultaneously with the requirements in Part 10, "Perimeters and Walls", Part 11, "Drainage", and Part 12, "Penetrations and Curbs", because of natural sequencing of hot fluid-applied rubberized asphalt systems.
Only trained, manufacturer-qualified installers may apply hot fluid-applied rubberized asphalt membranes.
Hot fluid-applied rubberized asphalt must be applied
1. to small areas with a long-handled, straight-edged rubber blade squeegee,
2. following a grid pattern,
3. in even coats,
4. without bubbles, pinholes, and blisters, and
5. at the manufacturer’s specified temperature, when measured at the point of application.
The base coat of hot fluid-applied rubberized asphalt shall be installed uniformly, and shall have a measured, thickness no less than 2.3 mm (90 mils), but this minimum may be exceeded by the manufacturer’s specifications (thickness shall be periodically verified with a probe, and recorded).
Reinforcement fabric
1. must be broomed into the hot base coat,
2. must be installed in parallel overlapping runs,
3. must be saturated by the hot primary membrane,
4. must overlap adjacent fabric runs as specified by the manufacturer and shall be no less than 12.7 mm (1/2”) (Membrane must overlap adjacent fabric runs so that the overlap is "wet to wet"; a wider overlap must be avoided because it risks the possibility of non-bonding reinforcement materials because of "dry-to-dry" application), and
5. should avoid folds, air pockets or wrinkles.
The topcoat of hot fluid-applied rubberized asphalt must be installed uniformly
1. over a hot, reinforced base coat,
2. on the same working day, and
3. to a minimum measured wet thickness of 3.2 mm (125 mils), unless exceeded by the manufacturer’s specifications (thickness shall be periodically verified with a probe, and recorded).
The finished membrane shall have a nominal measured wet thickness of 5.5 mm (215 mils).
The membrane protection layer specified by the manufacturer and accepted by the Guarantor must be installed as the membrane topcoat is applied.
Each installed area of the primary membrane, reinforcement and protection materials must overlap adjacent area by at least 76.2 mm (3”), and all overlapping joints must be fully bonded.
When the installation of hot fluid-applied rubberized asphalt must be continued the next working day, the working edge must be kept clean, dry, and free of contamination, to ensure continuity of all constituent layers.
Before any roof covering, structure or equipment is installed, roof membranes must be
1. inspected,
2. scanned for breaches, when an integrity scan is required by this Standard, and
3. free of deficiencies.

9.3.2.4. Cold and Inclement Weather Application

Installation during cold weather must follow the manufacturer’s guidelines for storage and membrane conditioning.
When permitted by the manufacturer, membranes may be applied in ambient air temperatures lower than -18⁰ C (0⁰ F), but application below -18⁰ C is not recommended.
Membranes shall not be installed in inclement weather unless expressly permitted by the manufacturer, in writing.

9.3.2.5. Securement on Slopes

Membrane installed on slopes greater than 1:6 (2” in 12”) shall be applied following the manner specified by the manufacturer.

9.3.2.6. Reserved

9.3.2.7. Protection of Membranes

The membrane protection layer specified by the manufacturer and accepted by the Guarantor must be embedded into the membrane as the topcoat is applied (also refer to the requirements in Article 9.3.2.3.).
All protection materials must be covered with a drainage mat before any other materials are installed.
Installed membrane must be covered by the rest of the roof system or overburden within 30 days of completion.
The Contractor, and other trades who use primers for self-adhering membranes typically installed on walls or around doors, window, or other wall penetrations, must protect membranes
1. from splashed or dripped primer used to enhance adhesion of self-adhering membranes, as the primer may damage the membranes and cause leaks, and
2. from accidental damage, including damage by staged materials, scaffolding, foot and equipment traffic, and anything else that may pose a hazard to the integrity of the membrane.

9.3.2.8. Transitions with Water-shedding Systems

Where slopes less than 1:16 (¾" in 12") intersect a water-shedding system, the waterproofing system must be designed to extend up the water-shedding system slope as described in Article 10.3.7.2., using methods conforming to the general application requirements in Article 10.3.2.3.

9.3.2.9. Walkways

When pavers are used as the walkway material, they must be
1. spaced no closer than 3.78 mm (1/8″),
2. supported by non-abrasive pads or proprietary pedestals providing a minimum of 12.7 mm (1/2″) of vertical separation to permit adequate airflow and leveling (Slip sheets under pedestals may be necessary to prevent membrane abrasion), and
3. secured against displacement by wind.

9.3.3. Reserved

9.3.4. Reserved

9.3.5. Uninsulated Systems

(The requirements in Subsection 9.3.2., "All Systems", shall be read together with the following articles)

9.3.5.1. Reserved

9.3.5.2. Membranes Installed on Concrete

Concrete decks shall be prepared as required in Article 9.3.2.1., and application of the primary membrane shall conform to the general requirements in Article 9.3.2.3.

9.3.5.3. Membranes Installed on Wood Decks

Wood decks shall conform to the requirements for wood decks in Subsection 2.1.5., shall be prepared as required in Article 9.3.2.1., and application of the primary membrane shall conform to the general requirements in Article 9.3.2.3.

9.3.5.4. Reserved

9.3.5.5. Reserved

9.3.5.6. Membrane Protection

Installed membranes must be protected from damage as soon as possible after integrity testing (Refer to Article 9.3.2.7. for general requirements).
The field membrane in an uninsulated roof system must be protected with
1. an asphaltic board when the roof is covered with overburden, or
2. a granule-surfaced SBS-modified bitumen membrane when the roof is exposed.

9.3.6. Protected Roof Systems

(The requirements in Subsection 9.3.2., "All Systems", shall be read together with the following articles)

9.3.6.1. Reserved

9.3.6.2. Membrane Protection

Installed membranes must be protected from damage as soon as possible after integrity testing.

9.3.6.3. Procurement and Installation of Other Materials

All components, including the gravel or paver ballast, must be supplied and installed by the Contractor.
Where a vegetated roof system (VRS) is used as ballast and the VRS
1. is intended to qualify for a RoofStar Vegetated Roof Guarantee, the VRS shall conform to the design, material, and construction requirements of the “RGC Standard for Vegetated Roofs” .
2. is not intended to qualify for a RoofStar Vegetated Roof Guarantee, may be installed by others but
3. the work must be coordinated with the Contractor, and
4. the VRS must be installed immediately upon completion of the Contractor’s work, to ensure the roof system is held in place (See also Article 14.1.3.12.).

Part 10 - Perimeters and Walls

Section 10.1. Design

10.1.1. General

10.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

10.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary.

10.1.2. Guarantee Term Requirements

10.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

10.1.3. All Systems

10.1.3.1. General Requirements

The Design Authority is responsible to specify the connections between the roof system and walls or other building components, particularly where the continuity of air, vapour and water-resistive control layers is critical or required by Code (See Part 6, "Air and Vapour Controls").
Projects must follow proper sequencing; materials must positively integrate (“shingle fashion”) with other materials, systems, or assemblies, including those installed by other trades.
Wall surfaces must be suitable to receive roof materials, or they must be covered with an accepted overlay panel material listed in Division C.
Where the roof deck and an adjoining wall are constructed of dissimilar materials (i.e., steel deck joined to concrete wall), differing expansion and contraction rates for the two materials may adversely affect the roof system and, in particular, the field and flashing membranes, and therefore it is incumbent upon the Design Authority to consult the manufacturer's literature and specify the correct materials for each particular roof-wall intersection.
When EIFS cladding is cut to permit roofing work, the exposed insulation must be restored with back-wrapped mesh, a base coat and finish coat, or with another method that is equal or superior (See Note A-10.1.3.2.(5)).

10.1.3.2. Membrane Flashing

All changes in plane in the roof system, and all intersections between the roof field and roof edges, walls, or parapets, must be flashed with
1. hot fluid-applied rubberized asphalt, protected with metal flashing,
2. hot fluid-applied rubberized asphalt and an embedded SBS-modified bitumen cap membrane flashing,
3. two plies of an SBS-modified membrane system, or
4. a liquid flashing membrane system.
No UV-sensitive membrane may be left exposed and must be fully protected with
1. the manufacturer’s proprietary protection material, or
2. base metal flashings.
3. All other specifications shall follow the application requirements in Article 10.3.2.3.
Sheet membrane flashing must be self-adhered, adhered with adhesives, or with torch-applied heat, and shall conform to the requirements in Article 10.3.2.3.
Linear metal flashing, or a RoofStar-accepted, fleece-reinforced 2-component polymethyl methacrylate (PMMA) liquid membrane flashing, is required at all roof edges, upper membrane terminations, curb tops, and at the tops of parapets, to protect sheet membrane flashing from damage.
Linear metal flashing used for the termination of sheet membrane flashing plies shall be installed in keeping with Article 13.1.3.3., "Securement".
Sheet membrane flashing must be protected from damage caused by foot traffic or shifting coverings, using base metal flashing or other methods acceptable to the Guarantor.
Where a roof allows water to freely drain off the edge, and the roof adjoins a wall, a cricket or diverter should be installed at the roof edge to prevent water intrusion behind wall finishes.

10.1.4. Perimeter Details, High Walls, and Openings

(The requirements in Subsection 10.1.3., "All Systems", shall be read together with the following Articles)

10.1.4.1. Parapets

Parapets may be waterproofed before a coping, its membrane, and metal coping (cap) flashing are installed, but the coping will be excluded from coverage unless the parapet membranes are carried onto and over the coping in accordance with the application requirements described in Article 10.3.4.1.
On roofs where overburden or ballast extends to the roof edge, parapets must be designed to retain the material against wind scouring, but in any event, they shall be no less than 203.2 mm (8”) in height when measured from the top of the finished roof system surface.
Parapets are optional, but when a parapet is specified it must be no less than 127 mm (5") in height, measured from the finished roof system surface to the inside top edge of the parapet (this height requirement facilitates proper metal cap flashing securement) (Ref. Article 10.3.4.1.; also see Article 13.3.2.3., "Cap Flashing, Counter-flashing, and Reglet Flashing").
Parapets with cavities must be designed with consideration for ventilation.
All parapet copings that form part of the Contractor’s scope of work must provide solid support for metal coping (cap) flashings and shall be suitable to receive mechanical fasteners (Ref. Article 13.1.3.6.; also see Article 13.3.2.1.).
When the width of any parapet exceeds 101.6 mm (4"), the coping (installed by other trades) must
1. slope toward the roof-side of the parapet wall, and shall
2. be sloped to meet the minimum requirements for metal coping (cap) flashing in Table 13.1.-A, Article 13.1.3.4.
Membranes specified for parapets with a pre-cast or stone coping must be at least 2.5 mm thick and shall be manufactured with a sanded top surface.

10.1.4.2. Low Profile Edges

A metal-edge termination detail may be used on an uninsulated roof system but must be fully blocked to support the metal and membrane edges.
Canted edges may be retained on existing roofs, but
1. this shall be at the discretion of the Design Authority, and
2. the canted substrates must be wood.
When, for aesthetic reasons, face-fastened metal flashing covering a canted edge is not desirable, cants may be replaced with
1. a metal edge roof termination, or
2. a parapet, designed and constructed in keeping with the minimum requirements in Article 10.1.4.1. and Article 10.3.4.1.

10.1.4.3. Tall Parapets

When a parapet higher than 609.6 mm (24") (a tall parapet) is specified as part of the Contractor’s scope of work,
1. membranes specified for the vertical surface of the wall, above the primary roof membrane flashing, must conform to the requirements in Article 10.2.1.1. , and
2. additional mechanical securement shall conform to the requirements in this Part, or to the requirements of the manufacturer, whichever is greater.
All roof intersections with walls shall conform to the requirements in Subsection 10.1.3., "All Systems", and shall maintain continuity with the wall control layers for air, vapour, and water.
Tall parapets with cavities must be designed with consideration for ventilation.

10.1.4.4. Fire Separations

(For reference, see Construction Detail "SBS | Fire Separation Joint" and "SBS | Fire Separation Wall")

Fire separation walls and joints
1. must be designed to conform to the “British Columbia Fire Code” and “British Columbia Building Code”,
2. shall incorporate non-combustible insulation where condensation control is desirable, and
3. shall specify the methods by which roofing materials will be affixed to the firewall (this includes the securement of linear metal flashings).

10.1.4.5. Doors, Windows, and Wall Openings

Rough openings formed or framed in walls to accommodate doors, windows, curtain-wall assemblies, or other penetrations (i.e., ventilation grilles), should be oversized to allow for the build-up of roof system flashing membrane.
Low-clearance openings (rough openings less than 203.2 mm (8") in height, measured from the finished roof system surface)
1. should be avoided, particularly when designing a roof to support any type of overburden (i.e., a vegetated roof system) , and
2. are not recommended because of their propensity to leak (a leak through a low opening is not covered by a RoofStar Guarantee) .
When a low-clearance opening is unavoidable or specified (i.e., to comply with Code for level access and egress) ,
1. the roof must be sloped away from the opening,
2. the rough opening shall not be less than 101.6 mm (4") above the drainage plane and must be waterproofed in keeping with the requirements in Article 10.3.4.5.,
3. the drainage plane must be free of obstructions and materials capable of displacing water,
4. the low-clearance opening should be protected by an overhang wherever practical, to minimize water intrusion that occurs from wind-driven rain or from snow accumulation, and
5. the opening must be protected by an overflow drain,
  1. situated on the same roof area as the low-clearance opening,
  2. located at least 25.4 mm (1") below the elevation of the rough opening, and
  3. conforming to the spacing and capacities required by the "National Plumbing Code of Canada", Division B, Article 2.4.10.4. (See also Article 11.1.3.1., "Principles of Design").
When the building interior transitions to an accessible roof surface through a flush door opening,
1. the design shall conform to the requirements in this Part, and to Article 14.1.3.11., and
2. the membrane installed over the rough opening sill must be protected from abrasion damage as described in Sentence 10.3.4.5.(6) below .

10.1.5. Reserved

10.1.6. Expansion and Control Joints

(The requirements in Subsection 10.1.3., "All Systems", shall be read together with the following Articles)

10.1.6.1. Expansion Joints

(See Note A-10.1.6.1.)

The design and placement of structural expansion joints is the responsibility of the Design Authority, but they must be considered wherever
1. expansion or contraction joints are provided in the structural assembly,
2. differential movement between structural components may occur (i.e., where a wall and the deck are separately supported, or
3. seismic movement is anticipated.
The location of expansion joints must be clearly indicated on the drawings, drawn in detail, and included in the specifications.
Expansion joints must be designed as a divided, raised structure, to achieve a minimum height of 203.2 mm (8"), measured from the finished roof system surface.
The expansion joint assembly, which permits movement between the two sides of the expansion joint structure,
1. shall be the work of others unless specified as part of the Contractor's scope of work (Ref. Construction Detail "Expansion Joint (Field)"),
2. shall be located at the high point of the drainage plane (the direction of drainage must be away from an expansion joint),
3. shall not be used as a pathway for drainage, either through or over the expansion joint assembly,
4. must be designed as a raised divider that incorporates a sloped top surface,
5. may utilize an elastomeric expansion system (see Article 10.3.6.1.), and
6. must have a designed height no less than 203.2 mm (8") when measured from the finished roof system surface.
The minimum height of an expansion joint may be reduced to 127 mm (5") if the primary roof membrane flashing is sealed to a self-supporting purpose-made elastomeric expansion joint system.
Proprietary elastomeric expansion joint systems, provided by others and manufactured with an EPDM-based core and flanges that can be fully bonded to the primary membrane, are not covered by a RoofStar Guarantee (unless expressly accepted by the Guarantor and listed in Division C) but may be incorporated as part of the roof system provided the elastomeric expansion joint system is
1. specified for installation on a divided, raised structure,
2. specified for installation at least 203.2 mm (8") above the finished roof system surface,
3. compatible with the roof membrane and acceptable to the manufacturer,
4. designed and manufactured to accommodate building movements of at least 500% elongation at -40°C (-40°F) across its length and at all vulcanized points,
5. factory-fabricated by means of vulcanization,
6. manufactured as one piece, complete with all joints, details, and connections, and
7. completely protected from damage with sloped linear metal flashing.

10.1.6.2. Control Joints (Roof Dividers)

(See Note A-10.1.6.2.; also see Article 10.3.6.2.)

The Design Authority is responsible
1. to determine the need for control joints (roof dividers), and
2. to specify their location and design.
The Design Authority must consider specifying control joints
1. when a single roof area exceed 61 m (approx. 200’) in length and the membrane is limited in its flexibility (consult the manufacturer for their recommendations),
2. for buildings in climate zones with significant seasonal temperature swings,
3. where an addition joins an existing building,
4. where the deck type changes (i.e., steel transitions to wood),
5. where insulation in the roof system changes thickness,
6. where the roof deck changes in elevation, and
7. when interior heating conditions change.
Specified and detailed control joints should be located at the high points of the roof, so that water drains away from both sides of the divider and is not impeded by it.
Control joints must be
1. constructed as a raised divider,
2. sloped on the top face,
3. fabricated with a minimum height of 203.2 mm (8"), measured from the finished roof system surface, but this may be reduced to a height of 101.6 mm (4”) if the control joint is fully enveloped in no fewer than two plies of sheet membrane flashing, or to 127 mm (5”) if capped with linear metal flashing (Ref. Article 12.1.3.4. concerning sleepers), and
4. waterproofed in keeping the requirements in Article 10.3.2.3., together with the manufacturer’s published specifications for the detail.
Unless otherwise approved by the Guarantor, control joints must be specified to divide a new roof system (addition) from existing roof systems (Ref. Article 1.1.4.5.).

10.1.7. Intersections with Other Roof Systems

(The requirements in Subsection 10.1.3., "All Systems", shall be read together with the following Articles)

10.1.7.1. Intersections with Water-shedding Roofs

Intersections with water-shedding roofs must be designed according to the requirements in Article 10.3.7.2.

10.1.7.2. Intersections with Membrane Gutters

Refer to Article 11.1.4.3.

10.1.8. Alternative Approaches for Membrane Flashing

(The requirements in Subsection 10.1.3., "All Systems", shall be read together with the following Articles)

10.1.8.1. Specifying Hazard-reduction Strategies

The Design Authority should consider alternatives to heat-applied materials when the application process involves Hot Work (Ref. Article 1.1.3.5.) and the substrate to which they will be applied is combustible, or when nearby structures, openings, or materials, present a fire hazard; in the alternative, choose a suitable separation or overlay material as protection from open flame.
Self-adhering or adhesive-applied membranes as alternatives to heat-applied membranes are acceptable to the Guarantor and must also be acceptable to the manufacturer.
The application of materials to a combustible surface, using a torch, is strictly prohibited (Refer to Sub-section 10.3.8., "Alternative Approaches to Sheet Membrane Flashing", for application requirements).

Section 10.2. Materials

(See Division C, "Accepted Materials")

10.2.1. Material Properties

10.2.1.1. Flashing Membranes

Sheet membranes used to flash the intersection of the roof field and perimeter walls must conform to the membrane requirements found in Article 9.2.1.1.
When waterproofing the vertical plane of a tall parapet above the primary membrane roof system is specified as part of the Contractor's scope of work (Ref. Article 10.1.4.3. and Article 10.3.4.3.), the membrane used on the vertical plane of the parapet shall
1. be compatible with the primary membrane,
2. be self-adhering,
3. be declared suitable for the application by the manufacturer (see Note A-10.2.1.1.(2)(3)),
4. possess properties consistent with the design and characteristics of the wall assembly,
5. possess a high softening point and a minimum flow temperature of 87.7°C (190°F) (ASTM D5147, "Standard Test Methods for Sampling and Testing Modified Bituminous Sheet Material") and
6. have a thickness no less than 1 mm (.040”).
Some membranes may be susceptible to damage from bird droppings, pet urine, and chemical contamination (oils, solvents, or any discharge from a mechanical unit), and therefore they should be protected using measures designed in consultation with the manufacturer.
Fleece-reinforced liquid membrane flashing systems must be accepted by the Guarantor and proprietary to, or accepted by, the manufacturer.

10.2.1.2. Linear Metal Flashing

Linear metal flashing incorporated into roof perimeters and walls must conform to the materials and fabrication requirements in Part 13, "Linear Metal Flashing".

10.2.1.3. Reserved

10.2.1.4. Sealants

Sealants applied to linear metal flashing, where sheet membrane flashing is terminated, shall conform to the requirements in Article 13.2.1.4.

10.2.2. Securement Materials

10.2.2.1. Fasteners

Where fasteners are used in the roof system
1. to secure waterproofing materials, they shall conform to the requirements in Article 3.2.2.1.
2. to secure linear metal flashings, they shall conform to the requirements in Article 13.2.1.4.

Section 10.3. Application

10.3.1. Guarantee Term Requirements

10.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

10.3.2. All Systems

10.3.2.1. Substrate Preparation

All wall surfaces to which roofing materials must be installed (including Concrete Masonry Unit (CMU)) shall be
1. prepared in like manner to the roof deck (Ref. Article 9.3.2.1.) and declared suitable by the manufacturer, or
2. covered with a RoofStar-accepted overlay panel conforming to the material requirements in Article 5.2.1.3. and installed to conform to Article 5.3.2.5.
Wherever the primary membrane will be applied, gaps or cracks that exceed 1.59 mm (1/16”) in width must be reinforced prior to the application of the membrane using the manufacturer’s proprietary reinforcement material.
When proprietary reinforcement material is not available to repair gaps and cracks, they may be reinforced using a self-adhered or torch-applied SBS-modified bituminous base membrane
1. conforming to the requirements in Article 9.2.1.3., and
2. installed according to the requirements published in the "Standard for SBS-modified Bitumen Membrane Systems".

10.3.2.2. Material Preparation

Hot fluid-applied rubberized asphalt used for membrane flashing shall be prepared following the requirements in Article 9.3.2.2.
SBS-modified bitumen membrane flashing shall be prepared following the requirements in the "Standard for SBS-modified Bitumen Membrane Systems".

10.3.2.3. General Application Requirements for Perimeters and Walls

All changes in plane in the roof assembly must be waterproofed with a material acceptable to the Guarantor.
Projects must follow proper sequencing so that materials, systems, or assemblies, installed by the Contractor correctly interface with materials, systems, or assemblies installed by other trades, to establish or preserve continuity and ensure positive waterproofing connections (overlapping, “shingle fashion”).
When coordination with other trades requires some adaptation to the requirements in this Standard, any variance to proper detail sequencing must be approved in writing by the Design Authority.
Membrane flashing shall be carried up vertical surfaces at least 203.2 mm (8") above the finished roof system surface but shall be carried vertically at least 304.8 mm (12") when air, vapour, or water control systems in wall assemblies are present or specified, to permit sufficient positive continuity.
When SBS-modified bitumen sheet membrane flashing is used, installation shall conform to Article 10.3.2.3. of the "Standard for SBS-modified Bitumen Membrane Roof Systems", and to the manufacturer's published instructions.
Low-clearance openings in walls (rough openings less than 203.2 mm (8") in height, measured from the finished roof system surface) are permissible provided they conform to the requirements in Article 10.3.4.5.
Where a roof allows water to freely drain off the edge, and the roof adjoins a wall, a cricket or diverter should be installed at the roof edge to prevent water intrusion behind wall finishes.
EIFS walls that must be cut to permit membrane replacement work must be restored with back-wrapped mesh, a base coat, and a finish coat, or with another method that is equal or superior.

10.3.2.4. Protection of Membranes

All installed membranes must be protected from splashed or dripped primer (applicable to all trades).
Membrane flashing must be protected from damage caused by UV radiation, foot traffic, or shifting coverings, using a linear metal flashing (i.e., base flashing) or other methods acceptable to the Guarantor.
Protection materials shall be installed as required in Article 9.3.2.7.
When an integrity scan is not required because the conditions in Article 1.1.3.3. have been satisfied, the Contractor shall nevertheless protect installed field membranes and membrane flashing, immediately after installation, with RoofStar-accepted membrane protection materials.

10.3.3. Additional Requirements for Membrane Flashing

(The requirements in Subsection 10.3.2., "All Systems", shall be read together with the following Articles)

10.3.3.1. Torch-applied Membranes

The application of an open flame to combustible surfaces is not permitted.
All combustible surfaces, including (without limitation) decks, walls, blocking, or canted edges, must be protected from open flame by an acceptable separation or overlay material.
When the base membrane flashing is torch-applied, all overlay board joints and wall transitions must be sealed with the primary membrane manufacturer’s approved self-adhered membrane or tapes, or follow the methodologies in the "Standard for SBS-modified Bitumen Membrane Roof Systems".

10.3.3.2. Self-adhered and Cold Processed Membranes

Self-adhered membranes must be installed on a clean, uncontaminated surface.
All self-adhered and cold processed sheet membrane flashing that terminates on the vertical plane must be mechanically secured.
When self-adhered or cold-processed base sheet membrane flashing overlaps granule-surfaced cap sheet membrane flashing, the overlap shall be no less than 76.2 mm (3"), granules on the cap sheet membrane must be embedded to expose bitumen, and the overlap must be continuously sealed to comply with the requirements in Article 9.3.3.1. in the "Standard for SBS-modified Bitumen Membrane Roof Systems".

10.3.3.3. Reserved

10.3.3.4. Liquid Membrane Flashing

Two-component fleece-reinforced catalyzed polymethyl methacrylate (PMMA) liquid membrane flashing systems must be accepted by the Guarantor and listed in Division C, and
1. may be used
  1. on the drainage plane,
  2. where sheet membrane flashing may not be practical or even possible,
  3. to terminate the top edge of sheet membrane flashing,
  4. for sheet membrane reinforcement (i.e., at corners),
  5. where abrasion resistance is desirable,
  6. where resistance to sheet membrane contamination is necessary, or
  7. where the Design Authority specifies its application.
2. must be compatible with the primary sheet membrane flashing.
For all applications,
1. the substrate must be clean, dry, free of contaminants, and primed, as directed by the flashing system manufacturer,
2. a base layer of catalyzed liquid membrane resin must be applied within the area masked for coverage,
3. the base coating must be reinforced with the manufacturer’s fleece, cut to size so that the fleece is set in from the masked area no more than 3.78 mm (1/8”),
4. the fleece must be fully saturated with liquid, following the published instructions from the manufacturer, and
5. the embedded fleece must be coated with a second application of catalyzed liquid membrane resin, covering the masked area.
On vertical sheet membrane terminations, the liquid membrane flashing system shall provide no less than 50.8 mm (2") coverage, both above and below the sheet membrane termination.
Application rates and guidelines issued by the manufacturer of the liquid flashing product must be followed, unless superseded by these requirements (Ref. Figure 12.3.2.-A).
Where a fleece-reinforced 2-component catalyzed polymethyl methacrylate (PMMA) or polyurethane methyl methacrylate (PUMA) liquid membrane flashing system serves as a substitute for sheet membrane flashing, the reinforced liquid membrane flashing system must extend at least 203.2 mm (8”) up the vertical plane, and no less than 203.2 mm (8") onto the horizontal field plane.
When a granule surface or textured finish is specified, the granules or texturing material must be broadcast into a third coat.

10.3.4. Perimeter Details, High Walls, and Openings

(The requirements in Subsection 10.3.2., "All Systems", shall be read together with the following Articles)

10.3.4.1. Parapets

All parapets, regardless of their height, must be sealed with waterproofing membrane
1. applied to the roof-side face of the parapet, extending from the roof field to a point at least 203.2 mm (8”) above the finished roof system surface, and
2. applied to the sloped top and exterior faces.
When sheet membrane flashing is used to satisfy the requirements in Sentence (1),
1. no fewer than two plies shall be used to waterproof the bottom 203.2 mm (8") of a parapet wall, immediately above the finished roof system surface, and
2. no fewer than two plies shall be used to completely seal the entire roof-side and top faces of a parapet wall that measures 609.6 mm (24") or less in height (the second, or cap sheet ply, may be carried up onto the top face of the parapet, but this is subject to the manufacturer's requirements),
Membrane applied to parapet walls must be fully bonded to the entire surface of the parapet (Ref. Article 13.3.2.3.(4)).
Coping that is part of the roof system must be continuously waterproofed as part of the roof system, even if the coping is flashed separately from the parapet wall.
All membrane bonded to a parapet coping shall continue over the top and extend down the outside face of the coping, overlapping any joint at least 50.8 mm (2”).
Parapets shall be waterproofed to conform to the requirements in Article 10.3.2.3. of the "Standard for SBS-modified Bitumen Membrane Roof Systems".
A tall parapet (taller than 609.6 mm (24”))shall be waterproofed in keeping with the requirements in Article Article 10.3.4.3.).
Where a parapet intersects with a higher wall, water must be directed to the outer surface of the wall by flashing the union with
1. an acceptable SBS-modified bituminous sheet membrane flashing,
2. membrane gussets at the corners, and
3. a metal saddle assembly.
When a parapet is capped with a pre-cast concrete or stone coping,
1. the membrane over the top of the parapet must be drilled by others to receive dowels,
2. the dowels must be installed by others, and
3. the dowels must be sealed by the Contractor, following the requirements in Article 14.3.2.7., Sentences 6 and 7, for sealing dowels installed in pre-curbs.

10.3.4.2. Low Profile Edges

Metal edge flashings must be
1. supported over a solid substrate,
2. installed after application of an accepted bituminous membrane, which must wrap onto the outside face of the roof edge and extend downward to overlap any cold joint by at least 50.8 mm (2”),
3. embedded in a membrane-compatible mastic or sealant,
4. fastened to the roof structure with mechanical fasteners spaced 203.2 mm (8”) O.C. in offsetting rows (Ref. Article 13.3.2.1.),
5. joined to each other with lap joints measuring at least 101.6 mm (4”), each joint sealed with butyl or gunnable sealant,
6. cleaned and prepared to receive membrane,
7. primed with the manufacturer's accepted primer, unless specified otherwise by the manufacturer,
8. sealed beneath the primary membrane, which must extend at least 101.6 mm (4") onto the metal flashing, and
9. finished with an accepted protection layer that is fully bonded with the primary membrane.
Existing canted edges must be
1. made of wood, and
2. flashed with sheet membrane in keeping with the requirements in Article 10.3.2.3.

10.3.4.3. Tall Parapets

Sheet membranes installed on a tall parapet above the termination of primary roof membrane flashing
1. shall conform to the material requirements in Article 10.2.1.1.,
2. must be applied with the methodology prescribed by the manufacturer,
3. shall positively overlap the primary sheet membrane flashing by at least 50.8 mm (2”),
4. shall underlap the roof sheet membrane flashing installed to cover the top of a parapet by at least 50.8 mm (2"),
5. may be used to waterproof the coping of a tall parapet , and
6. shall be protected from UV radiation with a metal flashing, cladding or another wall covering.
The application of sheet membrane over the coping of a tall parapet shall conform to the manufacturer’s prescribed methodologies but may be installed parallel to the long axis of the parapet as permitted in Article 10.3.4.1.(2) for a standard parapet ("Standard for SBS-modified Bitumen Membrane Roof Systems"), provided the conditions therein are satisfied.

10.3.4.4. Fire Separations

(For reference, see Construction Detail "SBS | Fire Separation Joint" and "SBS | Fire Separation Wall")

Fire separation walls and joints
1. shall conform to the specified design,
2. shall be waterproofed in keeping with the requirements in this Part,
3. shall not incorporate combustible materials over the top of the joint or wall,
4. shall be offset from metal cap flashing joints (in the alternative, soldered standing seams or a water channel clip may be used when joints align; see Construction Detail "SBS | Fire Separation Wall"),
5. shall exclusively utilize s-locks and concealed continuous clips for securing linear metal flashing to a firewall face, and
6. shall utilize only standing seam joints for linear metal cap flashings.

10.3.4.5. Doors, Windows, and Wall Openings

Rough openings formed or framed in walls to accommodate doors, windows, curtain-wall assemblies, or other penetrations (i.e., ventilation grilles), must be waterproofed before the door, window, curtain-wall, or another assembly is installed.
All rough openings must be suitable for the application of sheet membrane flashing or reinforced liquid membrane flashing systems, and any work to render surfaces suitable shall be performed by others.
Low-clearance openings (rough openings less than 203.2 mm in height, measured from the finished roof system surface) must be flashed using methods described in this Article; curtain-wall openings may be flashed using a modified metal water-stop flashing method by eliminating the water-stop flashing, provided the remaining required work is executed by the Contractor.
Membranes used for this application must conform to the material requirements in Article 10.2.1.1., "Flashing Membranes".
In all methods described in this Article, low-clearance openings must be pre-flashed with no less than one ply of base sheet membrane
1. lapped over the field membrane in keeping with requirements found elsewhere in this Part,
2. carried over the top face of the rough opening, and
3. carried vertically above the sill, at least 101.6 mm (4").
Regardless of the method described below, the membrane installed over the rough opening sill must be protected from abrasion damage with
1. a full-coverage pre-manufactured threshold step (by others) ,
2. a full-coverage metal flashing, supplied and installed by the Contractor, or
3. fleece-reinforced PMMA, coated with an abrasion-resistant coating proprietary to the PMMA manufacturer .
When the metal water-stop flashing method is specified,
1. all corners must be reinforced with compatible membrane gussets, and.
2. the metal water-stop flashing must be
  1. fabricated to fit the full width of the opening,
  2. fashioned with a water dam upstand measuring at least 25.4 mm (1”) in height,
  3. installed over the sill membrane,
  4. embedded in a membrane-compatible mastic or sealant,
  5. mechanically attached to the sill, and
  6. sealed to the rough opening with an additional ply or coating of membrane flashing.
When the metal sill-pan flashing method is specified, a single-piece metal pan sill flashing must be
1. fabricated to fit snugly inside the rough opening,
2. folded, welded, or soldered in the corners,
3. fashioned with a water dam upstand measuring at least 25.4 mm (1”) in height,
4. fabricated with 101.6 mm (4”) high flanges that cover the insides of the rough opening and wrap around the outside face of the wall at least 101.6 mm (4”),
5. installed over the pre-flashing membrane and embedded in a membrane-compatible mastic or sealant,
6. mechanically attached to both the outside and inside faces of the rough door opening, and
7. sealed to the rough opening with an additional ply or coating of membrane flashing.
When clearances preclude the use of either the metal water-stop flashing method or the metal sill-pan flashing method, the rough opening may be flashed using the reinforced liquid membrane flashing.
When a reinforced liquid membrane flashing method is specified,
1. the rough opening must be flashed using the metal water-stop method,
2. the metal water-stop flashing must be sealed to the pre-flashing base membrane using an accepted liquid membrane flashing system,
3. the inside faces of the rough opening must be flashed with reinforced liquid membrane flashing, ensuring an overlap with the membrane on the sill at least 50.8 mm (2”),
4. liquid membrane flashing must extend up the inside faces of the rough opening at least 101.6 mm (4”), and
5. the liquid membrane flashing system must be applied following the requirements in Article 10.3.3.4.
Overflow drains must
1. be installed on the roof area adjacent any rough low-clearance opening,
2. be located at least 25.4 mm (1") below a rough low-clearance opening, and
3. conform to the spacing and capacities required by the "National Plumbing Code of Canada", Division B, Article 2.4.10.4. (See also Article 11.1.3.1., "Principles of Design").

10.3.5. Reserved

10.3.6. Expansion and Control Joints

(The requirements in Subsection 10.3.2., "All Systems", shall be read together with the following Articles)

10.3.6.1. Expansion Joints

Expansion joints, which are framed and sheathed by others, must be
1. sloped toward the roof surface on the top face of each side,
2. waterproofed as shown in Construction Detail "Expansion Joint (Field)", with methods and materials conforming to the requirements in Article 9.3.2.3., and with the manufacturer’s published specifications for the detail, and
3. covered with 2-part linear metal flashings (counter-flashing and cap flashing) that permit multi-directional movement in the joint.
When proprietary elastomeric expansion joint systems are specified, the bond between the sheet membrane flashing and the expansion joint system must be acceptable to both the manufacturer and the supplier of the expansion joint system (Ref. Article 10.1.6.1. for design requirements).
Field splicing of proprietary elastomeric expansion joints is permissible only when made with a machine acceptable to the expansion joint manufacturer.

10.3.6.2. Control Joints (Roof Dividers)

Control joints must be waterproofed in keeping the requirements in Article 10.3.2.3., together with the manufacturer’s published specifications for the detail.

10.3.7. Intersections with Other Roof Systems

(The requirements in Subsection 10.3.2., "All Systems", shall be read together with the following Articles)

10.3.7.1. Compatibility of Materials

Where two roof systems intersect, materials must be compatible with each other, or must be separated from contact by an intermediate separation layer.

10.3.7.2. Intersections with Water-Shedding Roofs

(See Note A-10.3.7.2. )

When a waterproofing roof system transitions down a slope onto a lower water-shedding roof system, the waterproofing membrane must lap over the water-shedding roof system by no less than 50.8 mm (2").
When a waterproofing roof system transitions up a slope and underlaps a water-shedding roof system,
1. sheet membrane flashing must extend up the water-shedding roof system slope at least
  1. 152.4 mm (6”), plus at least 76.2 mm (3”) for the overlap by the water-shedding roof system, when measured vertically from the maximum water level, and
  2. 304.8 mm (12”) plus at least 76.2 mm (3”) for the overlap by the water-shedding roof system, when measured vertically from the maximum water level, in regions with typical heavy snow,
2. the termination of the waterproofing roof system sheet membrane flashing on the slope must be mechanically secured, separately from the water-shedding roof system, and
3. the overlapping of adjoining roof system materials must conform to the requirements for the specific water-shedding roof system.

10.3.7.3. Intersections with Membrane Gutters

Refer to the requirements in Article 11.3.3.8.

10.3.8. Alternative Approaches to Sheet Membrane Flashing

(The requirements in Subsection 10.3.2., "All Systems", shall be read together with the following Articles)

10.3.8.1. General

When field membranes or flashing plies are heat-welded, or when construction sequencing requires strategies for mitigating fire risk, the Contractor is responsible to assess risks and should consider the means and methods in Subsection 10.3.8. of the "Standard for SBS-modified Bitumen Membrane Roof Systems".

Part 11 - Drainage

Section 11.1. Design

11.1.1. General

11.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

11.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Drain leader means "a pipe that is installed to carry storm water from a roof to a storm building drain or sewer or other place of disposal” ("British Columbia Plumbing Code", Division A, Article 1.4.1.2., "Defined Terms").
2. Flanged insert drain means a primary roof drain
  1. with a flat, broad flange that encircles, and is manufactured from the same material as, the drain opening or bowl,
  2. that is spun or hot-welded (not cast),
  3. that typically is secured to the roof assembly with screw-type mechanical fasteners, and
  4. that is manufactured with a short length of drain pipe ("drain stem"), which is inserted into a drain leader and sealed against back-flow using a compression seal.
3. Overflow drain ("overflow") means a secondary roof drain
  1. that serves as a safeguard when roof drains fail, and
  2. which may be located in the roof field (for example, as a secondary drain) or at the perimeter of the roof.
4. Primary roof drain means the primary means of draining water from the roof.
5. Roof drain means “A fitting or device that is installed in the roof to permit storm water to discharge into a leader.” ("British Columbia Plumbing Code", Division A, Article 1.4.1.2., "Defined Terms").
6. Scupper drain ("Scupper") means an open or closed roof drain that conveys water laterally from one roof area to another, or from the roof directly to the exterior of the building.
7. Secondary roof drain means a drain connected to a separate drainage system, typically situated at a higher elevation than a primary roof drain. An overflow drain is a type of secondary roof drain.

11.1.2. Guarantee Term Requirements

11.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

11.1.2.2. Reserved

11.1.2.3. RoofStar Vegetated Roof Guarantee

To qualify for a RoofStar Vegetated Roof Guarantee, the supporting roof assembly shall
1. comply with the requirements in this Part for a RoofStar 5-year Guarantee, RoofStar 10-year Guarantee, or a RoofStar 15-year Guarantee,
2. be acceptable to the manufacturer as support for a vegetated roof system, and
3. comply with the related requirements in the “RGC Standard for Vegetated Roofs”.

11.1.3. All Systems

11.1.3.1. Principles of Design

The Design Authority is responsible for the design of roof drainage and continuity of control layers, where these intersect with any part of the designed roof drainage system (Ref. Article 3.1.5.1.; also see Article 6.1.3.2.).
The size (flow rate) of roof drains and overflows must be determined using the "British Columbia Building Code" and "British Columbia Plumbing Code", with attention given to both average and large rainfall events (for rainfall capacities, refer to the "British Columbia Building Code", Div. B, Appendix C, "Table C-2", which lists rainfall loads using specific reference locations throughout the province.
Membrane gutters must be designed for their anticipated capacity, with consideration given to
1. rainfall and snow load calculations for the building location,
2. drain type, size, flow rate, and
3. size and placement of the overflow drain.
The Design Authority should coordinate the various disciplines (including, without limitation, mechanical (plumbing) and structural engineers) to calculate proper flow rates, head pressure, and structural supports, in anticipation of significant, short-duration rain events; consideration should be given to various design elements (listed without limitation)
1. roof slope (more slope theoretically increases drainage and lessens live loading from rainfall) (Ref. Article 2.1.3.1., "General Requirements for Roof Slope"),
2. rainfall rates for primary and overflow drainage,
3. primary and overflow drain capacities,
4. hydraulic head (pressure), and
5. the location of the drainage plane (the drainage plane is not necessarily the same as the finished roof system surface, and the location of the drainage plane may affect the determination of live loads, which should be accounted for as part of drainage design).
Roofs may drain off a roof edge, or by means of internal plumbing (both are permissible under the RoofStar Guarantee Program).
When a roof is designed to drain off an edge, water may drain freely or be collected by means of an external or built-in gutter (See Article 11.1.4.3.) and drained onto a lower roof assembly.
The membrane of the lower roof onto which drain water is directed must be protected from abrasion with splash pads.
Roof drains should be situated in a depression, to compensate for the build-up of membrane at the edge of the drain assembly, which may impede drainage.
All drains located at the level of the field membrane must be fully blocked above the supporting deck structure.
When a roof is fully or partially replaced, all flanged drains, scuppers, and overflows, together with internal drain-to-pipe compression seals, and seals exposed to water or ultraviolet light, must be replaced.
If a flow control is present in an existing cast drain leader, the flow control should be reinstalled.
Roofs that support overburden, and roofs that are secured with ballast, must be designed to incorporate a ballast guard that surrounds the drain and promotes proper drainage.
Article 11.3.3.2.).

11.1.3.2. Roof Drain Function and Location

Roof drains must be used only for draining water.
Roof drains on new construction projects must be located at least 457.2 mm (18") away from any adjacent drain, penetration, upstand, edge, or wall (the separation space is measured between openings, excluding the flange), but this requirement does not apply to overflow drains, scupper drains, and membrane gutters (Ref. Article 11.3.3.7. for minimum requirements applicable to scuppers and overflows).
Notwithstanding the requirements in Sentence (1), a cast iron roof drain with a sump receiver must be placed well away from any interference with drain securement.
When a roof is replaced and existing roof drain do not comply with the spacing requirements in this Part, the Design Authority must submit a drawn detail for a review by the Guarantor; the detail must incorporate the following requirements and principles, together with requirements in Subsection 11.3.3:
1. Wall membrane flashings must not terminate under the clamping ring of a cast drain.
2. The clamping ring of a cast drain must be fully seated to ensure the drain will function properly.

11.1.4. Drains and Membrane Gutters

(The requirements for Subsection 11.1.3., "All Systems", shall be read together with the following Articles)

11.1.4.1. Cast-iron Roof Drains

Only cast-iron roof drains, and existing external couplers used to connect drains to leaders, may be re-used for roof replacement projects.
Drain extensions for cast-iron roof drains should be avoided, since the connection with the cast drain is not sealed; the result is a leak into the roof system.

11.1.4.2. Scuppers and Overflows

(See Note A-11.1.4.2.)

A scupper drain may serve either as a primary roof drain or as a secondary drain.
Where no overflows are specified, the building structure should be designed to carry the total load of water collected on the roof, in the event of primary roof drain failure.
Overflows must be
1. designed as open-wall scuppers for parapets measuring 152.4 mm (6”) or less in height (Ref. Construction Detail "Open-wall Scupper Drain"), or
2. designed around the principles of a through-wall scupper when parapets are higher than 152.4 mm (6”) (Ref. Construction Detail "Through-wall Scupper Drain"), and (irrespective of design) shall be
  1. located no higher than 101.6 mm (4”) above the drainage plane,
  2. installed at least 25.4 mm (1”) lower than the lowest elevation of a door, window, or other low-clearance opening, to prevent water intrusion,
  3. situated so that they freely and visibly discharge storm water,
  4. protected with a ballast guard when the overflow is located below the finished roof system surface, and
  5. specified to conform to the spacing and capacities required by the "National Plumbing Code of Canada", Division B, Article 2.4.10.4. (See also Article 11.1.3.1., "Principles of Design").

11.1.4.3. Membrane Gutters

(See Note A-11.1.4.3.)

A RoofStar Guarantee may cover a membrane gutter (gutters lined with an adhered membrane and typically integrated into the roof structure) only when the membrane gutter and the adjoining roof area are part of the same scope of work.
The Design Authority is responsible to design the membrane gutter for its anticipated capacity, with consideration given to
1. rainfall and snow load calculations for the building location,
2. drain type, size, and flow rate, and
3. {size and placement of the overflow drain.
New membrane gutters shall be designed with a minimum width of 304.8 mm (12”) and a depth not exceeding the gutter’s width.
At least 101.6 mm (4") clearance on the horizontal plane is required between any membrane gutter wall and the
1. the edge of the drain bowl for spun drains, and
2. the edge of the drain leader for flat spun or welded drains.
Only fully-adhered membranes may be used in membrane gutters.
Metal gutter liners are permissible, provided they are designed to fit over acceptable waterproofing, and the liners conform to the material requirements in Article 11.2.1.3.
An overflow drain must be located at least
1. 101.6 mm (4”) above the primary membrane gutter drain, and
2. 25.4 mm (1”) below any mechanical fasteners used to secure the adjoining roof system.
In roof replacement applications, existing membrane gutters may qualify for a RoofStar Guarantee, but should be redesigned if their capacity is undersized, and must incorporate an overflow drain in keeping with the requirements in this Part.
Where the primary drain in an existing membrane gutter is undersized for its capacity, the primary drain must be replaced with one that is properly sized.
When a membrane gutter adjoins a RoofStar-guaranteed water-shedding system, the transition from gutter to roof system shall conform to Article 11.3.3.8.

11.1.4.4. Drains in Planters

Drains designed for structural planters must conform to the requirements in Article 6.1.3.2. of the “RGC Standard for Vegetated Roofs”.

Section 11.2. Materials

(See Division C, "Accepted Materials")

11.2.1. Material Properties

11.2.1.1. General Requirements

Except for cast-iron roof drains, which are usually supplied and installed by others, only new drains and penetration flashings listed in Division C may be used.
Reuse of any penetration flashing or drain (except serviceable cast iron drains) is prohibited and may void the Guarantee (See Division A, Article 3.2.1.2.).
Sheet membranes used to flash (strip in) drains shall be reinforced with polyester or a composite scrim, but in any event must conform to the membrane requirements found in Article 9.2.1.1.

11.2.1.2. Roof Drains and Scuppers

(See Note A-11.2.1.2.)

All roof drains
1. must be designed and manufactured for roof applications only, and shall not be floor drains, and
2. shall be made so that the roof membrane can be sealed to the drain body or bowl (the membrane seal must not rely solely on a clamping ring).
Cast-iron primary roof drains
1. must be supplied with a sump receiver and under-deck clamp,
2. should separate securement of the under-deck clamp and clamping ring from securement for the strainer, and
3. must be installed by the trade supplying the roof drain.
Cast-iron planter drains must be supplied with a perforated riser that is proprietary to the drain manufacturer (See the “RGC Standard for Vegetated Roofs”, Article 6.1.3.2).
Cast-iron scupper drains must be
1. supplied with a clamping strainer, and
2. designed with cast, enclosed (captive) strainer bolt receivers (drains with bolts exposed on the back side of the drain body are not acceptable).
Lead sheet flashing, when specified for use with a cast-iron drain, must be sized to extend past the drain bowl by at least 152.4 mm (6”), and must have a weight of at least 15 kg/m² (3 lb/ft²).
All primary flanged insert drains (drains with a stem that inserts into a drain leader) must
1. be manufactured with a hot-welded or seamless flange at least 101.6 mm (4”) wide (measured from the outer edge of the drain opening),
2. be hot-welded at the joints between the bowl/flange and drain stem, and
3. incorporate a clamping ring.
Primary flanged drains (insert drains or scuppers) that connect with plumbing inside the building (“internal” drains) must be constructed of
1. copper (min. weight: 24 oz. sheet copper; min. thickness: 20-gauge, or 0.889 mm (0.035”)), or
2. aluminum (min. thickness: 12-gauge, or 2.053 mm (0.08081”)).
Primary flanged drains (insert drains or scuppers) that drain directly to the exterior of the building (“external” drains) must be constructed of
1. copper (min. weight: of 16 oz.; min. thickness: 24-gauge, or 0.559 mm (0.022”)), or
2. aluminum (min. thickness: 20-gauge material, or 0.812 mm (0.03196”)).
All scupper drains (open, or closed (boxed)) must be
1. manufactured with welded seams and joints,
2. designed to extend past the outside face of the wall, and
3. fabricated from
  1. copper (min. weight: 16 oz.; min. thickness: 24-gauge, or 0.559 mm (0.022”)), or
  2. aluminum (min. thickness: 20-gauge material, or 0.812 mm (0.03196”)).
In addition to the general requirements for scupper drains, closed (boxed) scupper drains must also be
1. fully enclosed on four sides, for through-wall applications,
2. fabricated with a drip edge at the bottom outside edge of the drain to deflect overflow water away from the building, and
3. fitted with an overflow opening on the outside face of the scupper,
  1. equal in capacity to the main drain leader opening, and
  2. at least 38.1 mm (1-1/2”) lower than the top surface of the scupper drain.
Overflow drains
1. must have a hot-welded or seamless flange at least 101.6 mm (4”) wide when measured from the outer edge of the drain opening, and
2. may be manufactured from ferrous metals (See Section 13.2.).
All roof drains utilized in a roof assembly that includes gravel ballast or growing media (soil) must be supplied with the drain manufacturer's proprietary primary drain strainer and secondary stainless-steel ballast guard, but when one is not provided, a custom-fabricated guard may be used provided the guard
1. is fabricated from 20-gauge stainless-steel (0.9525 mm or 0.0375”),
2. incorporates 6.35 mm (1/4”) perforations, and
3. equals or exceeds the height of the finished roof system surface.

11.2.1.3. Membrane Gutters and Gutter Liners

Membrane gutter membranes shall be
1. accepted by the Guarantor,
2. acceptable to the manufacturer,
3. compatible with the adjoining roof system, and
4. manufactured for full adhesion (semi-adhesion and mechanical securement are not permissible).
A reinforced liquid membrane system (PMMA or PUMA) approved for field use and applied to an accepted SBS-modified base membrane is acceptable as a gutter membrane.
A metal gutter liner
1. may be fabricated from
  1. copper sheet material, incorporating soldered seams, or
  2. stainless steel, incorporating welded seams, and
2. must conform to the sheet metal requirements in Article 13.2.1.2.

11.2.1.4. Fasteners

Mechanical fasteners used to secure the roof membrane and penetration flashings, or related accessories, must be
1. properly sized in accordance with roof system securement requirements (See Part 3), and
2. self-drilling purpose-made screws manufactured with deep, recessed heads.

11.2.1.5. Sealants

Sealants must be manufactured by, or acceptable to, the manufacturer.
Compression sealants must be formulated to provide waterproofed seals under compressive loads.

Section 11.3. Application

11.3.1. Guarantee Term Requirements

11.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

11.3.2. All Systems

11.3.2.1. Condition and Suitability of Roof Drains

All clamping rings and strainers must be unbroken, properly seated, and fully secured.

11.3.2.2. Location and Spacing of Roof Drains

(See also Section 11.1., "Design")

Roof drains for new construction projects must be located at least 457.2 mm (18") away from any adjacent drain, penetration, upstand, edge, or wall (the separation space is measured between openings, excluding the flange).
The 457.2 mm (18") spacing requirement for roof drains does not apply to overflows, scupper drains, and drains used in membrane gutters.
Roof drains and cap membrane seams must be offset from each other at least 304.8 mm (12”), measured from the edge of the drain.

11.3.2.3. Drain Protection Against Blockage

All roof drains must be supplied and installed with a secured strainer to prevent debris from blocking the drain.
When a roof supports overburden or is secured with ballast, drains must be installed together with a surrounding ballast guard that promotes water flow.
When the overburden is a vegetated roof system, roof drains must be protected by both a stone /ballast guard and a separation zone, as required in Article 5.1.3.3. of the "RGC Standard for Vegetated Roofs" .

11.3.2.4. General Installation Requirements

Roof drains must be
1. secured to the supporting deck structure, or to blocking, and
2. properly detailed for continuity with specified control layers.
When a roof supports overburden or is secured with ballast, drains must be installed together with a surrounding ballast guard that promotes water flow.
Drains must be flashed using the primary membrane system or accessories acceptable to the manufacturer and the Guarantor.
When fleece-reinforced liquid membrane systems are used to flash drains, only a RoofStar-accepted reinforced two-component catalyzed polymethyl methacrylate (PMMA) may be used on the drainage plane to flash roof drains, scuppers, and overflows.

11.3.3. Drains and Membrane Gutters

(The requirements for Subsection 11.3.2., "All Systems", shall be read together with the following Articles)

11.3.3.1. Reserved

11.3.3.2. General Requirements for Cast-iron Roof Drains

Cast-iron roof drains must be installed by the plumbing/mechanical trade.
When cast-iron roof drains are used, a sump receiver and under-deck clamp must be provided and installed by the trade supplying the roof drain.
Drain extensions for cast-iron roof drains should be avoided.
Existing flow control removed during roof construction should be reinstalled; however, if the replacement roof will support a vegetated roof system, the drainage design must conform to the requirements set out by the Design Authority .
All cast-iron roof drains must be
1. new or clean,
2. unbroken (this applies to the clamping ring also), and
3. flashed in accordance with the manufacturer's published instructions, or to the requirements published in this Part, whichever are greater.
The continuity of air and vapour control layers must be maintained, where the controls are specified.

11.3.3.3. Reserved

11.3.3.4. Cast-iron Drains Installed with Membrane Flashing

The drain flange must be clean and dry.
When priming is required by the manufacturer, the drain flange must be primed with the manufacturer’s accepted primer.
The field membrane system must be installed according to the requirements in Article 9.3.2.3.
In addition to the manufacturer’s specific requirements for roof drains,
1. the clamping ring must be seated and secured, ensuring it is not broken, and
2. the drain screen must be securely installed.

11.3.3.5. Cast-iron Roof Drain Retrofitting (Replacement Roofing)

Retrofitting a cast-iron roof drain is not recommended, but when retrofitting is unavoidable (i.e., the drain has deteriorated to the extent that it cannot receive a new roof membrane, and removal is not possible),
1. remove any broken parts and debris,
2. connect the retrofit insert to internal leaders using only an external coupling (unless impractical - see alternative requirements below), and
3. follow the requirements set out in Article 11.3.3.2.
When an internal compression seal is used out of necessity to connect a retrofit drain to an existing drain leader,
1. the joint must be properly prepared to ensure the joined surfaces are clean, smooth, and uniform, and
2. honing out the cast pipe may be required.
In the absence of a clamping collar, the retrofit insert drain must be sealed to the primary membrane with another method acceptable to the manufacturer and the Guarantor (Ref. Article 11.2.1.6.)

11.3.3.6. Flanged Insert-type Roof Drains

Flanged insert drains installed with SBS-modified bituminous sheet membranes must conform to the requirements in Article 11.3.3.6. of the “Standard for SBS-modified Bitumen Membrane Roof Systems”.

11.3.3.7. Scuppers and Overflows

Open scupper drains may be constructed to match the height of the roof or membrane gutter edge, but must be fully sealed with membrane flashing (Ref. Construction Detail "Open-wall Scupper Drain").
When a through-wall scupper is specified, only fully enclosed scupper drains (enclosed on all sides and open only at the inflow and outflow ends) may be installed (Ref. Construction Detail "Through-wall Scupper Drain").
Scuppers and overflows that are installed through walls may be installed no closer than 203.2 mm (8") to
1. a roof drain, or
2. any protrusion and its flashing.
Scupper and overflow assemblies must be
1. cleaned and prepared to receive membrane flashing (refer to the membrane manufacturer’s published requirements),
2. embedded in a layer of trowelled membrane-compatible mastic,
3. primed on exposed flanges to receive membrane flashing,
4. mechanically fastened to the substrate (i.e., blocking, the roof deck, and the wall) with fasteners conforming to Article 11.2.1.4., and
5. sealed to the roof system with base sheet membrane flashing plies that
  1. lap onto the drain body flanges at least 101.6 mm (4”), and
  2. extend onto the surrounding field membrane or perimeter base membrane by at least 152.4 mm (6").
Cap sheet membrane flashing for scuppers and overflows must extend past the terminated edges of base membrane plies and seal to the drain flange.
Clamping collars must be securely installed according to their design, and where specified.

11.3.3.8. Membrane Gutters

All gutter membranes must be installed according to the manufacturer’s published instructions.
Sheet membranes installed in a gutter must be
1. installed perpendicular to the gutter length,
2. carried up an adjoining roof system (measured vertically from the maximum water level)
  1. at least 152.4 mm (6”), or
  2. at least 304.8 mm (12”) in regions with typical heavy snow,
3. lapped under and sealed to the adjoining membranes at least 152.4 mm (6”),
4. installed in keeping with application requirements in this Standard,
5. mechanically secured at their terminations, both on the outside of the gutter edge and on the field, and
6. secured above the maximum water level at least 152.4 mm (6”) and no more than 304.8 mm (12”) O.C.
Gutter drains and overflows must be installed in keeping with the requirements in Section 11.1., "Design".
Drain flanges that must be bent to accommodate the width of the gutter must be mechanically fastened to the gutter wall before membrane is installed.
A metal gutter liner
1. must incorporate soldered seams when it is fabricated from copper sheet material,
2. must incorporate welded seams when it is fabricated from stainless steel, and
3. must be installed
  1. over an adhered single ply membrane, no less than 2.3 mm (90 mils) thick (bituminous membranes) or 1.5 mm (60 mils) thick (non-bituminous membranes), and
  2. with a separation layer (slip sheet) between the membrane and the metal liner to prevent damage to the membrane caused by the liner at its joints.
The transition from a membrane gutter to a water-shedding system that is insulated (typically ASM only) shall conform to the requirements for membrane gutters in the "Standard for Architectural Sheet Metal (ASM) Roof Systems" (See Construction Detail "Membrane Gutter (Design Elements)" for an illustrated example).

Part 12 - Penetrations and Curbs

Section 12.1. Design

12.1.1. General

12.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

12.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary.

12.1.2. Guarantee Term Requirements

12.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

12.1.3. All Systems

12.1.3.1. General Requirements for Penetrations

Where a roof design includes openings through the roof assembly (i.e., for mechanical or electrical services), the specification and detail drawings shall
1. provide direction for continuity of control layers, where these layers intersect with any opening or penetration, and
2. require a curb or an acceptable penetration flashing to enclose and seal each roof opening.
Each penetration (except for clustered or bundled electrical cables) must be flashed separately from others.
Single or bundled electrical cable penetrations must be flashed with a suitable goose-neck flashing, fitted with a weather head.
Penetration flashings must be
1. new,
2. suitable for the type of penetration, and
3. properly sized and fitted around the penetration to permit a seal (gaps between the penetration and the inside of the flashing shall be no more than 12.7 mm (1/2"), or
4. of sufficient height to be made water-tight with a site-fabricated membrane seal fashioned to enclose the gap between the flashing and the penetration (see Figure 12.3.2.1.-A); the application of liquid sealant around the penetration in an open-top flashing is not acceptable.
Penetration flashings should be selected for their ability to inhibit the intrusion of vermin and insects into the roof assembly and building interior.
Suitable flashings must be specified for penetrations that are expected to expand, contract, or otherwise move.
Cylindrical ("pipe-type") penetrations must be sealed with
1. the manufacturer’s proprietary rubber-based friction seals that utilize mechanical clamps,
2. a 2-part site-fabricated or proprietary flashing with a removable inspection/access cap (Ref. Construction Detail "2-Part Retrofit Flashing (Cable Penetration)"), or
3. roof curbs fitted with customized metal hoods or square-to-round metal flashing.
Aluminum or copper flashings for penetrations may be located at the drainage plane in any assembly type.

12.1.3.2. Galvanized Penetration Flashings

Galvanized flashings and vents may be specified for use in the drainage plane on uninsulated systems, provided they conform to the requirements and conditions in Article 12.3.2.2.
All galvanized penetration flashings or vents specified for use in a protected roof system or modified protected roof system must be located on curbs no less than 203.2 mm (8") in height above the finished roof system surface.
Galvanized flashings with a base opening larger than 0.126 m² (196 in.²) in size must be supported by a curb.

12.1.3.3. Separation Between Details

Penetrations on new construction projects must be separated from other penetrations, drains, curbs, walls, or changes in plane so that the space between flashings for these details is at least 304.8 mm (12") (this is measured between openings or the edge of a detail and excludes the flashing flange); the exception to this requirement is customized penetration flashings designed for multiple individual or clustered penetrations.
When a roof is replaced and existing penetration locations do not comply with the spacing requirements in this Part, the Design Authority must submit a written request for a Variance, as specified in Article 1.1.3.6., "Variances".

12.1.3.4. Curbs, Sleepers, and Equipment Pads

The design and placement of curbs and sleepers shall be the responsibility of the Design Authority.
Curbs must be designed so that they can be secured directly to the deck structure, or to intermediate blocking, and must not be situated on top of the roof system.
All curbs, sleepers, and deck-supported equipment pads must be designed to achieve a minimum height of 203.2 mm (8”), measured from the finished roof system surface, to permit proper membrane flashing.
Notwithstanding the minimum height requirement membrane flashing, curbs and sleepers that are completely sealed (enveloped) with membrane, and are free of penetrations through the top face (i.e., equipment isolators) may be less than 203.2 mm (8”) in height but shall be
1. no less than 101.6 mm (4") in height, or
2. no less than 127 mm (5") in height when capped with a linear metal flashing.
Equipment isolators are not considered part of the roof system and therefore any leaks caused by or occurring at isolators shall be excluded from coverage under the Guarantee.
Equipment ("housekeeping") pads placed on top of the finished roof system surface and supporting combined loads
1. less than 90 kg (200 lbs) must be separated from the membrane with a bond-breaking layer (i.e., XPS insulation), and
2. greater than 90 kg (200 lbs) must conform to the requirements for structural sleepers or equipment pads.
Reinforced liquid membrane flashing systems may be specified only where
1. sheet membrane applications are not practicable (i.e., complex geometry), or
2. the top edge of membrane plies must be terminated on a vertical surface and other means of termination are not practicable or even possible.

12.1.3.5. Protection of Roof Membranes

The Design Authority must consider and specify mitigating strategies to preserve the membrane from damage (i.e., specifying grease guards or a reinforced 2-part liquid membrane coating) when mechanical equipment extracts and discharges grease, chemicals, or other contaminants, onto the roof.

12.1.3.6. Railings, Ladders, and Other Attached Structures

Railings, ladders, and other attached structures shall not be affixed at the field membrane level and should be designed for attachment to vertical surfaces only.
Attachment of railings, ladders, and other attached structures to a raised horizontal substrate is strongly discouraged, but when this manner of securement is specified, the design must be submitted in writing by the Design Authority to the Guarantor for review and acceptance through a written Variance.
Ladders, railings, or other structures that may penetrate the roof system, should be designed to minimize thermal bridging (and consequential condensation) or reduced thermal performance; uninsulated direct, rigid connections to the structural deck or walls is strongly discouraged.

Section 12.2. Materials

(See Division C, "Accepted Materials")

12.2.1. Material Properties

12.2.1.1. Membranes Used for Flashing

Sheet membranes used to flash (strip in) penetrations and curbs shall be
1. the same membrane used on the roof field, or
2. sheet or liquid membranes conforming to Article 10.2.1.1.

12.2.1.2. General Requirements for Penetration Flashings

All roof penetration flashings, except flashings that are proprietary to the manufacturer and flashings that are installed or supplied by others as part of a Code-compliant, certified chimney assembly (i.e., for solid fuel heating appliances), must be
1. accepted by or acceptable to the Guarantor,
2. manufactured to conform to CSA-B272, "Prefabricated Self-Sealing Roof Vent Flashings" (a penetration flashing fabricated by the Contractor is exempt from this requirement),
3. permanently marked with the standard number it conforms to, which shall be independently validated through published testing by a qualified third-party,
4. manufactured from sheet metal conforming to the material requirements in Section 13.2., when the flashing is custom-made or fabricated by the Contractor,
5. compatible with the roof system,
6. seamless or, in the alternative, fabricated with fully hot-welded joints, including a base flange at least 101.6 mm (4”) wide,
7. capable of inhibiting the intrusion of vermin and insects into the roof assembly and building interior, and
8. at least 203.2 mm (8”) tall when measured from the finished roof system surface to an opening, or to the top of the flashing.
Metal penetration flashings that are purpose-made for
1. electrical cables must be goose-necked and supplied with a downward-facing weather head, and
2. plumbing vents shall be supplied with a matching settlement cap produced by the same manufacturer.
Galvanized penetration flashings, and galvanized vents, must
1. meet or exceed the CSA-A93 Standard,
2. be made with material galvanized steel (26-gauge or heavier) conforming to the metal requirements found in Part 13, "Linear Metal Flashing", and
3. be at least 203.2 mm (8”) tall when measured from the finished roof system surface to an opening.
Storm collars
1. must be fashioned from galvanized or stainless steel,
2. must slope downward from the penetration approximately 45°,
3. shall be at least 50.8 mm (2”) wide,
4. shall be self-locking or, in the alternative, manufactured to receive a mechanical band clamp, and
5. should be fabricated with a channel at the top edge, for retaining sealant.
EPDM used to form a seal between a penetration and its flashing (Ref. Article 12.3.2.1.(12)) shall be semi-cured and possess a nominal thickness of no less than 60 mils.
Unshielded flexible mechanical couplings used to join a flashing and a pipe penetration shall be
1. certified to meet ASTM C564 or ASTM D5926,
2. certified to meet ASTM C1173 and CSA-B602,
3. supplied with top and bottom proprietary screw-type stainless steel mechanical clamps,
4. leak-proof, resistant to chemicals, UV-stable, and
5. suitable for the penetration and flashing they join together.

12.2.1.3. Flashings for Heating and Plumbing System Penetrations

All plumbing vent flashings shall be non-ferrous.
Lead plumbing vent flashings are not permitted.
In addition to the general requirements in Article 12.2.1.2., all metal penetration flashings (except natural airflow vents) used for heating and plumbing penetrations must be
1. properly sized for the penetration, both in diameter and height,
2. flexible or sloped to suit the roof slope, and
3. supplied with a properly sized galvanized storm collar or settlement cap.

12.2.1.4. Reserved

Section 12.3. Application

12.3.1. Guarantee Term Requirements

12.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

12.3.2. All Systems

12.3.2.1. General Requirements for Flashing Penetrations

All penetration flashing materials must be new.
Anything that penetrates through the roof assembly , including openings for ventilation, must be
1. sealed to each control layer that it passes through or intersects, and
2. flashed with a curb, a purpose-made flashing, or a custom-fitted flashing, all of which shall be sealed to the roof system so that the penetration or opening is protected from water ingress, to at least 203.2 mm (8") above the finished roof system surface.
Each roof penetration must have its own flashing (except where a purpose-made flashing is designed for multiple penetrations), and each flashing
1. must be suitable for the slope and penetration, and
2. must be properly sized and fitted around the penetration to permit a seal.
All vertical penetrations that extend beyond the upper edge of a flashing shall be sealed to the flashing (the exception to this requirement is an open pipe penetration which is flashed with a purpose-made flashing and fitted cap that directs water back into the pipe).
Non-ferrous penetration flashings and vents that conform to the material requirements in Section 12.2. may be located at the drainage plane in any assembly type.
All penetration flashings must be clean, dry, absolutely free of contaminants, have an exterior finish that is suitable to receive sheet or liquid membrane flashing, and must be prepared in keeping with any surface preparation requirements published by the membrane manufacturer.
Lead penetration flashings are not permitted in a hot fluid-applied rubberized asphalt assembly.
All penetration flashings must be clean, dry, absolutely free of contaminants, have an exterior finish that is suitable to receive sheet or liquid membrane flashing, and must be prepared in keeping with any surface preparation requirements published by the membrane manufacturer.
Cable and horizontal pipe penetrations must be flashed with
1. a purpose-made flashing (i.e., a goose-neck flashing fitted with a weather head),
2. a sheet membrane-flashed curb fitted with a customized sheet metal hood (shaped to function like a weather head), or
3. a 2-component fleece-reinforced liquid membrane flashing as described in Article 12.3.2.6. (when other methods are not possible or practicable).
Cables passing through a penetration flashing should be drooped, and horizontal pipes should be fitted with a capillary-breaking collar, to prevent water from tracking along the cable or pipe, into the building; water tracking along cables and horizontal pipes does not constitute a leak and is therefore excluded from coverage under the Guarantee.
Each flanged penetration flashing must be installed after the first coat of membrane and shall be
1. primed, when required by the manufacturer,
2. embedded in the primary membrane,
3. securely fastened to the supporting deck structure or intermediate blocking, and
4. sealed to the base membrane coat with
  1. its own sheet membrane target patch (the use of a single target patch for multiple penetration flashings is not permissible unless otherwise stated in this Standard), or
  2. membrane flashing (retrofit flashings only).
When penetration flashings are closer than 457.2 mm (18") to a roof drain,
1. both must first be secured and seated in base coat of hot fluid-applied rubberized asphalt (Ref. Section 11.3., "Application", for roof drains),
2. the drain target patch (sheet membrane flashing) must be installed so that it bonds to the hot fluid-applied rubberized asphalt base coat,
3. hot fluid-applied rubberized asphalt must be applied to the drain target patch where it will be overlapped by the penetration membrane target patch,
4. the membrane target patch around the penetration flashing must then be installed so that it bonds to the hot fluid-applied rubberized asphalt and overlaps the target patch for the roof drain (this promotes positive drainage), and
5. reinforcement fabric, the final primary membrane coat(s), and membrane protection, shall then be applied to complete the installation.
When the separation between penetration flashings is less than 304.8 mm (12") but greater than 203.2 mm (8") (Ref. Article 12.1.3.3.), the penetrations must be
1. flashed together with a single membrane target patch that extends at least 152.4 mm (6") past the edge of the flashing flanges,
2. coated with the final membrane coat, and
3. additionally sealed at the base of the flashing tube with the manufacturer's compatible liquid membrane flashing system
  1. conforming to the application requirements in Article 12.3.2.6.,
  2. carried up the penetration flashing at least 101.6 mm (4"), and
  3. carried onto the field membrane at least 203.2 mm (8").
When the separation between penetration flashings is less than 203.2 mm (8"), the penetrations must be waterproofed
1. with a curb,
2. by elevating the penetrations above the drainage plane, or
3. with another method acceptable to the Guarantor (See Note A-12.3.2.1.(13)).
Sheet membrane target patches applied over flanged penetration flashings shall be
1. cut from a single piece of the manufacturer's acceptable SBS-modified sheet membrane (when the penetration is large, the target patch may be cut from two pieces of membrane that must be joined with laps at least 152.4 mm (6”) in width,
2. sized to extend past the edge of the flashing flange onto the roof field by at least 101.6 mm (4") (for non-conforming penetration spacing, see Sentence (12) in this Article),
3. aligned with the base field membrane runs, or be turned 45-degrees to the base field membrane,
4. sealed to the entire flange, terminating approximately 12.7 mm (1/2") from the flashing upstand, and
5. sealed to the field membrane beyond the edge of the flashing flange, as evidenced by continuous bleed out of bitumen along all edges of the patch (Ref. Article 9.3.2.6. concerning seams).
Cap membrane installed over a flanged penetration flashing
1. shall extend past the edge of the target patch membrane and terminate at the flashing upstand, and
2. must be sealed along the cut edge of the membrane with
  1. a compatible mastic embedded with granules, or
  2. a reinforced 2-component liquid membrane flashing, applied in keeping with the standards found in Article 12.3.2.6.
Retrofit flashings (metal flashings fitted together around a penetration and riveted or clamped together) shall be flashed with
1. base sheet membrane flashing carried up the vertical face of the flashing at least 203.2 mm (8") and past the base flange at least 101.6 mm (4"), and
2. cap sheet membrane flashing which fully covers the base sheet flashing and extends past the termination of the base flashing by at least 50.2 mm (2")(Ref. Construction Detail "2-Part Retrofit Flashing (Cable Penetration)").
Where a purpose-made flashing does not fit the penetration (i.e., a penetration that is a square post), or when a penetration extends above the top edge of the flashing so that it cannot be enclosed with a cap See Figure 12.3.2.3.-A), the gap between the penetration and the flashing must be bridged and sealed
1. by wrapping the joint with a properly-sized piece of semi-cured EPDM (or its equivalent),
  1. loosely wrapped around the penetration and the flashing at least 1-1/2 times, or adhered to itself and overlapped at least 50.8 mm (2"),
  2. installed free of wrinkles or fish-mouths,
  3. applied so that it extends on either side of the joint by at least 50.8 mm (2"), and
  4. clamped at the top and at the bottom using stainless steel clamps set back from the membrane edge no more than 6.35 mm (1/4"), or
2. with heat-shrink tubing that
  1. extends onto both the flashing and the penetration by at least 50.8 mm (2"),
  2. is secured with stainless steel mechanical clamps installed at each end of the tubing, and
  3. is caulked with an acceptable sealant (when adhesive-lined heat-shrink tubing is used, the sealant may be omitted).
Penetrations that are flashed but are not immediately sealed using the methods described above must be temporarily protected from the weather with at least one properly fitted, level storm collar.
Unshielded flexible mechanical ("MJ") couplings
1. shall be clamped to the penetration and its flashing, and sealed along the top edge with an acceptable sealant, and
2. are suitable for use only with penetrations that will not expand, contract, or move with anticipated building settlement, i.e., fall protection anchors.
On a vertical penetration where a seal cannot be made between the flashing and the penetration (i.e., where the penetration is a hot pipe, or where movement of the penetration is anticipated), the opening between the penetration and top of the flashing must be protected with
1. at least one storm collar, secured with a separate mechanical (screw-type) clamp, or
2. no fewer than two storm collars, each manufactured with friction-type clips, and spaced approximately 25.4 mm (1") apart.
All installed storm collars must be sealed with a continuous, untooled bead of acceptable sealant at least 9.53 mm (3/8”) wide, applied to and centered over the joint between the collar and the penetration.
Reinforced liquid membrane flashing systems may be used (where permitted in Article 12.3.2.6. ) to seal a penetration on, or within 203.2 mm (8") of, the drainage plane, but only where
1. the penetration is structurally attached to a solid roof deck (concrete or mass timber) and the penetration will not move, shrink, or expand, or
2. the penetration is structurally independent of the roof deck, but is of the same type of material (i.e., steel post passing through a steel deck), and
3. sheet membrane applications are not practicable (i.e., complex geometry), or
4. the top edge of sheet membrane plies must be terminated on a vertical surface and other means of terminating them are not practicable or even possible.

Figure 12.3.2.3.-A Alternate Flashing of Pipe Penetration
Forming Part of Sentence 12.3.2.3.(16)
(Click to expand illustration)

12.3.2.2. Galvanized Penetration Flashings

Galvanized, hot-welded flashings and vents may be installed on uninsulated systems or in a protected roof system, provided they are installed on curbs no less than 203.2 mm (8") in height above the finished roof system surface (Ref. Article 12.1.3.2.) and are sealed to the curbs with sheet membrane.

12.3.2.3. Separation Between Penetration Flashings

Penetrations on new construction projects must be separated from
1. other penetrations, curbs, walls, or changes in plane so that the space between flashings for these details is at least 304.8 mm (12") (this is measured between openings or the edge of a detail and excludes the flashing flange), and
2. roof drains at least 457.20 (18") (Also see Article 11.1.3.2.).
When the separation between penetration flashings does not conform to the minimum spacing requirements, the application options described in Article 12.3.2.1. must be followed.

12.3.2.4. Curbs, Sleepers, and Equipment Pads

Sheet membrane flashing for curbs must provide continuous waterproofing from the roof field up the vertical plane, at least 203.2 mm (8”) above the finished roof system surface and shall conform to the requirements in Article 10.3.2.3., unless otherwise specified or permitted in this Part; waterproofing of equipment installed on a curb (i.e., isolators and other mounts) is the responsibility of others.
When specified by the manufacturer, base sheet membrane flashing plies must be embedded in a hot coating of the primary membrane applied to the vertical substrate or parapet wall.
Exposed membrane edges on curbs must be protected from UV radiation, and from water intrusion, using a counter-flashing or options described in Article 10.3.2.3.
When installing heat-welded membranes, or where construction sequencing requires it, alternatives to conventional membrane flashing should be considered (Ref. Article 12.3.2.5.).
Reinforced liquid membrane flashing systems shall conform to the requirements in Article 12.3.2.6., and may be used only
1. where sheet membrane applications are not practicable (i.e., complex geometry), or
2. where the top edge of membrane plies must be terminated on a vertical surface and other means of termination are not practicable or even possible (See also Article 12.3.2.6.).
Sleepers or equipment pads that are completely sealed (enveloped) with sheet membrane must be at least 101.6 mm (4") in height above the finished roof system surface, but when fully enveloped sleepers or equipment pads are capped with linear metal flashing, they must be at least 127 mm (5") in height above the finished roof system surface to provide sufficient height for exposed fasteners.
All penetrations through the top surface of a sleeper or equipment pad must be sealed using
1. a compression sealant between the membrane and equipment supports, and
2. a universal sealant applied around the edges of equipment supports.
Equipment ("housekeeping") pads placed on top of the finished roof system surface and supporting combined loads
1. less than 90 kg (200 lbs) must be separated from the membrane with a bond-breaking layer (i.e., XPS insulation), and
2. greater than 90 kg (200 lbs) must be waterproofed to conform to the requirements for structural sleepers or equipment pads in this Section.

12.3.2.5. Alternative Approaches to Membrane Flashing

The Contractor must assess the best approach to waterproofing any detail, when site conditions or construction sequencing require alternatives to heat-welding.
When alternative methods are required,
1. curbs must be flashed by adapting the methods described in Article 10.3.8.2. of the "Standard for SBS-modified Bitumen Membrane Roof Systems", or by using other approaches that are equal or superior, and
2. penetrations must be
  1. incorporated into an adhered or self-adhered field membrane system, or
  2. flashed by using a pre-flashing method that is suitable for the penetration.

12.3.2.6. Liquid Membrane Flashing

Any liquid flashing system shall be used only when permitted by the manufacturer, and it's use shall conform to the permissible applications in this Article.
Liquid membrane flashing systems may not be used on plastic substrates.
Two-component fleece-reinforced catalyzed polymethyl methacrylate (PMMA) and polyurethane methyl methacrylate (PUMA) liquid membrane flashing systems must be accepted by the Guarantor and listed in Division C, and
1. may be used
  1. on the drainage plane,
  2. where sheet membrane flashing may not be practical or even possible,
  3. to terminate the top edge of sheet membrane flashing,
  4. for sheet membrane reinforcement (i.e., at corners),
  5. where abrasion resistance is desirable,
  6. where resistance to contamination of sheet membrane is necessary, or
  7. where the Design Authority specifies its application.
2. must be compatible with the primary sheet membrane flashing,
3. shall be applied to a properly prepared substrate, which must be clean, dry, free of contaminants, and primed, all as required by the manufacturer in their published instructions,
4. must be applied within masked boundaries to produce clean, straight, plumb edges, and
5. shall be applied to ensure that
  1. the rate of application conforms to the manufacturer's published instructions, unless superseded by this Standard,
  2. the base coating of catalyzed liquid membrane resin evenly and fully covers the masked area,
  3. the manufacturer’s reinforcement fleece is cut to cover the masked area, to within 3.78 mm (1/8”) of all edges,
  4. the fleece is fully embedded in, and saturated with, the based coating of resin, and
  5. the fleece is evenly and thoroughly coated with a second application of catalyzed liquid membrane resin, covering the masked area.
Where a fleece-reinforced 2-component catalyzed polymethyl methacrylate (PMMA) liquid membrane flashing system is used to terminate sheet membrane on the vertical plane, the liquid membrane flashing system must overlap the sheet membrane, and it must extend onto the vertical substrate above the sheet membrane, by no less than 50.8 mm (2") (Ref. Figure 12.3.2.-B).
Fleece-reinforced 2-component catalyzed polymethyl methacrylate (PMMA) liquid membrane flashing system that is used as a substitute for sheet membrane flashing must be carried up a vertical plane at least 203.2 mm (8”), and no less than 203.2 mm (8") onto the horizontal field plane ( See Figure 12.3.2.6.-A).
Single-component polyurethane and silicon-based liquid membrane flashing systems
1. must be accepted by the Guarantor, acceptable to the manufacturer, and shall be listed in Division C,
2. may be used
  1. to flash details more than 101.6 mm (4”) above the water plane, that cannot be sealed with sheet-type membranes, or
  2. to seal pre-curb dowels (see Article 14.3.2.7.).
3. must not be used in the drainage plane, or to reinforce membranes against abrasion,
4. must be applied in two cured coats, unless otherwise permitted in this Standard, and
5. must be fleece-reinforced between coats where
  1. the application is considered permanent,
  2. a change in plane (angle) occurs, or
  3. there is a joint between two supports and the liquid membrane must serve as a bridge.
Accessory PMMA detailing products
1. must be accepted by the Guarantor, acceptable to the manufacturer, and listed in Division C,
2. must be reinforced with chopped or loose fibres,
3. shall not be used as a substitute for fleece-reinforced 2-component PMMA systems, where these are required or exclusively permitted,
4. must be used at locations 101.6 mm (4”) or more above the drainage plane, except where complex details, such as bolt heads, cannot be properly sealed with a fleece-reinforced 2-component PMMA system, and
5. must not be used where movement is expected.

Figure 12.3.2.6.-A Application Requirements for PMMA on Roof Penetration
Forming Part of Sentence 12.3.2.6.(4)
(Click to expand illustration)

12.3.2.7. Railings, Ladders, and Other Attached Structures

(See also Construction Detail "Railing")

Fasteners installed to secure railings, ladders, and other structures to the vertical face of walls must be located at least 88.9 mm (3-1/2") above the finished roof surface.
Railings, ladders, and other structures mounted on a waterproofed horizontal substrate that is part of the roof assembly (i.e., on top of a parapet) shall be fully flashed around each base with a fleece-reinforced liquid membrane flashing material, unless directed otherwise by a written Variance issued by the Guarantor, using a product that is
1. suitable for use in the drainage plane,
2. applied in keeping with the requirements in Article 12.3.2.6., and
3. compatible with roofing membranes installed on the substrate.
Railings, ladders, and other structures shall not direct water into a roof system by means of weep holes or the method of fastening.

Part 13 - Linear Metal Flashing

Section 13.1. Design

13.1.1. General

13.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

13.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Drip edge means the bent (kicked-out) hemmed edge of a linear metal flashing, measuring at least 19.05 mm (3/4") and angled no more than 30° from vertical ("Architectural Sheet Metal Manual" published by the Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA), Sixth Ed.: p. 2.3); it is used to direct dripping water away from the face of the metal flashing or the materials it is protecting, such as a wall. A drip edge may be fabricated on any linear metal flashing but is commonly used on coping (parapet cap) and counter-flashing (also see the Glossary for a colloquial use of the term).
2. Hemmed edge means an edge of a linear metal flashing that is folded onto itself (bent 180°), to render a smooth (not raw or sharp) finish (this is sometimes referred to as a "safety edge").
3. Linear metal flashing means flashings cut and shaped from flat metal stock, to redirect water at roof perimeters and edges, or to control the flow of water in valleys and drainage spillways. Linear metal flashings also protect roof membranes from weathering and damage and provide an aesthetic finish to the roof system.

13.1.2. Guarantee Term Requirements

13.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

13.1.3. All Systems

13.1.3.1. Scope and Function

(See also the "Architectural Sheet Metal Manual" published by the Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA))

Linear metal flashings described in this Part and referenced elsewhere in this Standard
1. are considered necessary and integral to the scope of a project designed and constructed to qualify for a RoofStar Guarantee,
2. do not perform a waterproofing function and therefore must be specified for use over membrane flashing, or designed to shed water onto a waterproofing or water-shedding primary material,
3. shall be new (reuse of any existing linear metal flashings is prohibited and may void the Guarantee (See Division A, Article 3.2.1.2., "Limitations and Exclusions of Guarantee"), and
4. shall be Contractor-fabricated to suit the project requirements or shall be listed in Division C as materials pre-engineered and manufactured by a metal supplier.
The requirements in this Part apply almost entirely to Contractor-fabricated linear metal flashings; consequently, RoofStar-accepted pre-engineered products accepted as systems are exempt from the requirements in this Part for metal gauge, profile, and securement, unless expressly stated otherwise.
Linear metal flashings
1. must be specified when UV-sensitive membranes require protection, or when membrane edges will otherwise be exposed to the sun, to water, or to physical damage, and
2. may be specified to cover parapet caps, sleepers, or curbs
  1. for aesthetic reasons, or
  2. to protect the membrane from damage resulting from maintenance (i.e., pressure washing of decks or pavers), or from foot traffic.

13.1.3.2. Information Required in Specifications

Subject to the requirements in this Standard, the Design Authority must specify
1. metal type, finish, and gauge,
2. seam types,
3. length of flashings (if different from the requirements in this Part), and
4. method of attachment (concealed or exposed fasteners).
Design drawings must detail metal flashing profiles desired for the project.

13.1.3.3. Securement

Securement of all linear metal flashings shall be specified in keeping with the application requirements in Article 13.3.2.1.

13.1.3.4. Gauge, Dimension Limitations, and Seams

Gauge, dimensions, slope, and length of linear metal flashings must be specified to conform to the requirements in Table 13.1.3.4.-A and Article 13.2.1.2., but shall not be less than 26-Gauge.
Specified seam types shall conform to the requirements in Table 13.1.3.4.-B and Article 13.3.2.2.

Table 13.1.3.4.-A.
Pre-finished Galvanized Steel Cap (Coping) Flashing (Gauge and Length Standards)
Forming Part of Sentence 13.1.3.4.(1).

Horizontal Span	Minimum Slope	Gauge	Maximum Flashing Segment Length	Seam Options
Up to 304.8 mm (12")	2%	26, 24	3048 mm (120")	S-lock or Standing Seam
Up to 304.8 mm (12")	2%	22+	3048 mm (120")	Butt Seams*
304.8 - 914.4 mm (12" to 36")	4%	24	3048 mm (120")	S-lock or Standing Seam
304.8 - 914.4 mm (12" to 36")	4%	22+	3048 mm (120")	Butt Seams*
914.4 mm (36") or greater	6%	24	1219.2 mm (48")	S-lock or Standing Seam
914.4 mm (36") or greater	6%	22+	1219.2 mm (48")	Butt Seams*

* Ref. Article 13.3.2.2., "Seams"

Table 13.1.3.4.-B.
Pre-finished Galvanized Steel Vertical Flashing (Gauge and Length Standards)
Forming Part of Sentence 13.1.3.4.(2).

Vertical Face	Gauge	Maximum Flashing Segment Length	Vertical Seam Options
Up to 152.4 mm (6")	26	3048 mm (120")	S-lock
Up to 203.2 mm (8")	24	3048 mm (120")	S-lock
Up to 304.8 mm (12")	22+	3048 mm (120")	Butt Seams*

* Ref. Article 13.3.2.2., "Seams"

13.1.3.5. Fit and Finish

Fit and finish of all linear metal flashings shall conform to the requirements in Subsection 13.2.2.
Drip edges are not required but are strongly recommended for linear metal flashings installed around the outside perimeter of a building, to protect wall finishes (Ref. Article 13.2.2.1. for fabrication requirements).

13.1.3.6. Cap Flashing, Counter-flashing, and Reglet Flashing

Cap (coping) flashings
1. are required for all parapets (including parapets on roof areas that are adjacent to each other),
2. are optional for roof dividers that are fully enveloped with roofing membrane (Ref. Article 10.3.6.2.), and
3. are recommended on roof dividers where the membrane may be susceptible to abrasion or mechanical damage.
All linear metal cap (coping) flashing specified for parapets shall indicate securement to a solid substrate
1. at every seam, using S-locks or standing seam clips (Ref. Article 13.3.2.2., "Seams"),
2. beneath the outside vertical face of the flashing, using hidden clips (Ref. Article 13.3.2.3.), and
3. on the roof-side (inside) face of the flashing.
The use of exposed fasteners on the exterior face of cap (coping) flashing specified for parapets is not permissible.
When the top surface of a wall exceeds 101.6 mm (4") in width, linear metal coping (cap) flashing must be specified with a minimum slope of 2% toward the roof-side of the parapet, to promote drainage (drainage toward the exterior of a building is not recommended).
All metal cap (coping) flashing must be designed with full, solid support.
When the specified cap flashing material is thicker or heavier than 18-gauge steel or aluminum, or it exceeds the permissible weight or gauge ranges for copper or zinc flashings, the seam and securement design must be submitted to the Guarantor for review prior to tender (See Article 13.3.2.2. concerning flat butt seams).

13.1.3.7. Intersections with Other Assemblies

Where a parapet intersects with a wall, the union must be designed to direct water to the roof, away from the outer surface of the wall, using a metal saddle assembly in combination with the membrane requirements in Article 10.3.4.1. (Ref. Article 13.3.2.3.).

Section 13.2. Materials

(Ref. Division A, Article 3.2.1.2. concerning limitations and exclusions for metal flashing.)

13.2.1. Material Properties

13.2.1.1. Manufacturing and Supply

Linear metal flashings must be new, manufactured and supplied by the Contractor or by an Associate Member of the RCABC, and must conform to the requirements published in this Part.

13.2.1.2. Sheet Metal Grade and Gauge

A mill certificate must be provided by the Contractor when requested by the Design Authority.
The following minimum gauges and/or weights of sheet steel materials apply to all linear metal flashings (the reference standard for gauges is USS REV (metric in mm)):
1. Galvanized steel: minimum 0.50 mm (0.0196", 26-gauge) galvanized steel sheet, conforming to ASTM A653 / A653M-06 CS Type B, Z275 (G90) coating. Thickness tolerance as per ASTM A924/A924M-06 ±0.08 mm (0.003") for sheet widths not exceeding 1524 mm (60").
2. Stainless Steel: minimum 0.38 mm (0.014", 28-gauge) stainless steel, Type 302, 304, 316, 2B finish to ASTM A167-82. Maximum thickness tolerance variation ± 0.04 mm (0.0015") based on 1219.2 mm (48") wide sheet.
3. Aluminum-Zinc alloy-coated steel: minimum 0.50 mm (0.0196", 26-gauge) aluminum-zinc alloy coated steel sheet, conforming to ASTM A792/A792M-06 CS Type B, AZM150 (AZ50) coating. Thickness tolerance as per ASTM A924/A924M-06 ±0.08 mm (0.003") for sheet widths not exceeding 1524 mm (60").
The following minimum gauges and/or weights of non-ferrous materials apply to all linear metal flashings:
1. Aluminum: minimum 0.80 mm (0.032", 20-gauge) aluminum sheet, utility quality to CSA HA Series - 1975, plain or embossed finish. Maximum thickness tolerance variation ± 0.06 mm (0.0025") based on 1219.2 mm (48") wide sheet.
2. Copper: minimum 0.56 mm (24-gauge; 0.0216", 16 oz.) copper sheet, cold rolled roofing copper to ASTM B370-81. Maximum thickness tolerance variation ± 0.09 mm (0.0035") based on 1219.2 mm (48") wide sheet.
3. Zinc: minimum 0.80 mm (0.031") zinc Sheet conforming to European standard EN 988-1996. Maximum thickness tolerance variation ± 0.03 mm (0.0012").
Where a waterproofing system adjoins and "Architectural Sheet Metal System", linear metal flashings must be fabricated from 24-gauge steel stock.

13.2.1.3. Fasteners

Fasteners must be
1. threaded screws, friction-type pins (i.e., for masonry or concrete), plug (inserts),or rivets (where permitted),
2. compatible with materials they contact,
3. corrosion-resistant,
4. specified by the Design Authority, and
5. appropriately sized, in both length and thread type, for the material to which they will be secured.
Nails are not acceptable as fasteners.
Notwithstanding the requirements in Sentence (1), threaded fasteners used to secure linear metal flashings
1. in concealed locations must be at least No. 8, corrosion-resistant screw or expansion fastener with a low-profile head and must be compatible with both the metal flashing material and the substrate.
2. in exposed locations must be at least No. 10., shall be gasketed (cladding screws), and must match the colour of the materials they fasten.
When pre-engineered linear metal flashing systems are specified, fasteners provided by the manufacturer must be used.
Rivets shall be closed-end, dome-head type, and shall be used only for fastening together linear metal flashings.

13.2.1.4. Sealants

Sealants shall be
1. non-hardening high-quality butyl or polyurethane,
2. available in either gun grade or sealant tape form,
3. suitable for exterior use and able to resist the effects of weathering, and
4. compatible with, and able to adhere to, the materials to which they are applied.
Sealants shall conform to
1. CGSB 19-GP-5M, “Sealing Compound, One Component, Acrylic Base, Solvent Curing”,
2. CAN / CGSB-19.13, “Sealing Compound, One Component, Elastomeric, Chemical Curing”,
3. CGSB 19-GP-14M, “Sealing Compound, One Component, Butyl-Polyisobutylene Polymer Base, Solvent Curing”, or
4. CAN / CGSB-19.24, “Multi-Component, Chemical Curing Sealing Compound”.

13.2.2. Fabrication and Finish

13.2.2.1. Fabrication of Flashing

Linear metal flashings must be new, must conform to the requirements published in this Part, and shall be manufactured and supplied
1. by the Contractor,
2. for the Contractor by another Contractor (RCABC Member), or
3. by an Associate Member of the RCABC.
Unless expressly accepted otherwise, all linear metal flashing fabricated by the Contractor shall conform to the requirements in this Part.
Specified drip edges must be broken (bent) outward from the face of the flashing by at least 30° and shall measure at least 19.05 mm (3/4”), extending from the break.
All linear metal flashing, except those that are pre-engineered and expressly accepted by the RGC,
1. must be hemmed,
2. shall conform to the minimum requirements in Tables 13.1.-A,
3. shall incorporate seams conforming to the requirements in Table 13.1.-B, and
4. may not exceed the maximum length of 3000 mm (120”).
The vertical leg of any metal flashing that overlaps roofing material must be at least 76.2 mm (3") in height, exclusive of the drip or hemmed edge, when measured between each break and shall overlap the edge of a membrane (i.e., membrane flashing on a wall) by at least 25.4 mm (1”).
Metal edge flashing must be fabricated with
1. a flange measuring no less than 101.6 mm (4") in width,
2. a vertical drop and hemmed drip edge at least 50.8 mm (2"), and (When transitioning to a lower water-shedding systems), and
3. a sloped drop of no less than 101.6 mm (4").
Metal edge flashing may be constructed with or without an upstand at the outside edge (Edge flashing intended as a drainage edge may perform best without an upstand).

13.2.2.2. Pre-painted Finishes

When a painted finish on linear metal flashing is specified, only SMP and PVDF pre-painted finishes are acceptable.
Where Architectural Metal Roofing is installed, adjoining linear metal flashing must have the same finish as the metal panels.

Section 13.3. Application

13.3.1. Guarantee Term Requirements

13.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

13.3.2. All Systems

13.3.2.1. General Requirements for Linear Metal Flashing

RoofStar-accepted pre-engineered securement systems must be secured according to the manufacturer’s specifications.
All linear metal flashing installed over an organic substrate (i.e., wood) shall be separated from the substrate with a suitable separation material (i.e., self-adhered bituminous membrane used as eave protection in a water-shedding roof system).
Unless otherwise provided for in this Part, mechanical fasteners used to secure linear metal flashing or their clips
1. shall conform to the fasteners requirements in Article 13.2.1.3.,
2. shall be spaced no more than 304.8 mm (12”) O.C.,
3. shall be firmly fastened, without distorting secured materials,
4. must penetrate the substrate as specified in the screw manufacturer’s published minimum values, but shall nevertheless penetrate
  1. through the back surface of steel framing at least 19.05 mm (3/4"),
  2. into or through plywood so that screw threads engage its full thickness, excluding the unthreaded tip, and
  3. into solid substrate (i.e., dimensional lumber or concrete) at least 25.4 mm (1"), and
  4. must be installed at least 88.9 mm (3-1/2") above the finished roof system surface.
Canted edge metal flashing may be mechanically fastened from the outside face but shall not be face-fastened on the roof side of the flashing.
Sealants must be tooled to positively shed water.

13.3.2.2. Seams

(The requirements in Article 13.3.2.1., "General Requirements for Linear Metal Flashing", shall be read together with the following requirements. See also Article 13.1.3.4.)

RoofStar-accepted pre-engineered linear metal flashing may be joined together using seams specified for the accepted flashing.
All linear metal flashing that is not pre-engineered must be seamed together following the requirements set out in this Article.
All seams must allow for metal expansion and contraction.
The seam and securement design must be approved by the Guarantor when the specified cap flashing material
1. is steel or aluminum, and the material is thicker or heavier than 18-gauge, or
2. is copper and zinc, and the material thickness or weight exceeds the weight or gauge requirements in Article 13.2.1.2.
Straight (linear) joints between lengths of linear metal flashing must be fully seamed using only an S-lock ( Figure 13.3.2.2.-A) or Standing Seam ( Figure 13.3.2.2.-B), but this requirement does not apply to
1. flashing fashioned from 22-gauge metal (or heavier), or
2. the vertical face of any flashing that is concealed by a wall assembly, counter-flashing, or equipment flange, in which case the vertical joint may be lap-seamed, provided the overlap
  1. is no less than 101.6 mm (4”) when fully caulked in the lap, or
  2. is no less than 152.4 mm (6”) when installed without caulking in the lap.
The top face (horizontal plane) of flashings that intersect at a corner (i.e., coping flashing) must be joined with a standing seam.
Where drip edges meet at an outside corner, the cut edges of the mitred joint must be mechanically connected (Closed with a "rat tail").
When the face of vertically-oriented flashing forms an outside corner, and the height of the flashing
1. is greater than 101.6 mm (4”), the two flashings must be joined using only a standing seam.
2. is 101.6 mm (4”) or less, the two flashings must be joined using
  1. a standing seam,
  2. an S-lock, or
  3. a lap joint, but the drip edges must be mechanically connected (Closed with a "rat tail").
When the face of vertically-oriented flashing forms an inside corner, and the height of the flashing
1. is greater than 101.6 mm (4”), the two flashings must be joined using only a standing seam.
2. is 101.6 mm (4”) or less, the two flashings must be joined using
  1. a standing seam, or
  2. a flat overlapped seam.
Sealant applied to S-lock or standing seams is not a requirement in this Standard, but when it is specified
1. the sealant must be applied along the full length of the seam, and
2. any sealant that extrudes from the seam during the seaming process must be removed and discarded (See Article 1.3.2.2., "Workmanship").
Standing seams must incorporate clips when the seam is longer than 101.6 mm (4”), and the clips must be
1. fabricated from flat metal stock 24-gauge or heavier,
2. at least 38.1 mm (1-1/2”) wide,
3. spaced apart from each other no more than 203.2 mm (8”) O.C.,
4. embedded in an acceptable sealant, and
5. secured with at least 2 acceptable low-profile flat head screws.
S-locked seams must be secured through flashing tab (leaf) with at least one (1) acceptable low-profile flat head screw when the seam is longer than 101.6 mm (4”), but fasteners must not be spaced more than 203.2 mm (8”) O.C.
Flat butt seams
1. are permissible only for cap (coping) flashings, and only when the flashing is fabricated from steel or aluminum ranging in thickness from 22-Gauge to 18-Gauge (the same applies to the equivalents for copper and zinc sheet material, by gauge or weight), and
2. must have a hemmed front edge fabricated to hook onto a supporting saddle.
The saddle for flat butt seams must be
1. manufactured from the same material as the flashing,
2. formed to match the profile of the cap flashing,
3. fabricated with a hook along the front face,
4. secured to the parapet with screws,
5. installed to underlap the butt joint by at least 101.6 mm (4”) on either side,
6. seated in two parallel beads of un-tooled sealant or butyl tape, which must be applied between the saddle and flashing, on either side of the butt joint, to all three adjoining faces, and
7. secured to the cap flashing along both faces of the parapet (See Article 13.3.2.1.).

Figure 13.3.2.2.-A S-Lock, Double Forming Part of Sentence 13.3.2.2.(5) (Click to expand illustration)	Figure 13.3.2.2.-B Standing Seam Forming Part of Sentence 13.3.2.2.(5) (Click to expand illustration)

13.3.2.3. Cap Flashing, Counter-flashing, and Reglet Flashing

(The requirements in Article 13.3.2.1., "General Requirements for Linear Metal Flashing", shall be read together with the following requirements)

Cap (coping) flashings must be
1. solidly and fully supported ,
2. separated from organic materials (i.e., wood) with roofing membrane,
3. joined using standing seams or S-locks (Ref. Article 13.3.2.2.), and
4. secured against displacement by wind.
In addition to the requirements in Sentence (1), cap (coping) flashing installed on parapets must be secured
1. beneath the outside vertical face of the flashing with hidden clips that hook into the drip edge by at least 12.7 mm (1/2") (Ref. Article 13.3.2.3.; exposed fasteners are not permitted), and
2. along the roof-side face of the flashing, using either hidden clips or cladding fasteners (the method used shall be what is specified by the Design Authority).
Unless otherwise permitted in this Standard or by a written Variance from the Guarantor, hidden clips shall be secured to the vertical face of a parapet wall and shall not be mechanically attached to the top of the coping.
In addition to the requirements in Sentence (1), cap (coping) flashings installed on roof dividers and fire separation walls (Ref. Article 10.3.4.4.)
1. may be face-fastened, provided the roof divider or fire separation wall is less than 1 m (39") tall, but
2. shall be secured with hidden clips on both sides when the roof divider or fire separation wall exceeds a height of 1 m.
When using exposed screws to secure cap (coping) flashing is permissible, screws shall be located no more than 25.4 mm (1") above the break for the drip edge and provision shall be made for metal expansion and contraction.
Where hidden metal clips are required, they must
1. be at least 24-gauge,
2. be fastened as close to the bottom edge (hook) as practical but must not be fastened further than a maximum of 76.2 mm (3") from the bottom edge (hook), and
3. engage drip or safety edges by a minimum of 12.7 mm (1/2").
Continuous concealed clips must be attached with fasteners spaced nor more than 304.8 mm (12") O.C.
Discontinuous concealed clips must
1. consist of a single clip, centred between the seams of each length of metal flashing,
2. measure at least 1/3 of the length of flashing it will secure but shall not be less than 101.6 mm (4") in length, and
3. be fastened with screws spaced no more than 304.8 mm (12") O.C.
Fasteners used to secure any cap, counter, or base flashing must be evenly spaced between seams along each length of flashing, and shall be
1. no fewer than three (3) fasteners for every 3048 mm (120") length of metal flashing, or
2. two (2) fasteners for every 2438.4 mm (96") length of metal flashing.
When cap (coping) flashings span widths greater than 304.8 mm (12”), and a flat butt seam is specified, the cap flashing must be riveted to the saddle to ensure adequate securement, and the rivets must be no further apart than 203.2 mm (8”).
Parapets that intersect a wall must be flashed with a metal saddle flashing, as shown in the "Construction Details for Linear Metal Flashings" ( Division D).
When the outside face of a cap flashing is concealed by a wall assembly, only the outside face may be lap-seamed, provided the overlap is no less than 101.6 mm (4”) and the overlapping metal is embedded in mastic.
Counter-flashing must be secured to the vertical face, with fasteners or a reglet.
Counter-flashing and termination bars installed as primary securement or protection of membrane flashing
1. must be hemmed at the top edge and bent (broken) outward from the face of the wall by at least 45°, to form a groove for sealant (The hem shall measure at least 15.88 mm (5/8”) when measured from the break),
2. shall be attached to the substrate with fasteners spaced no more than 304.8 mm (12”) O.C., and
3. must be sealed along the top groove with a continuous bead of acceptable sealant, tooled to shed water away from the wall.
A second counter-flashing (to cover a term bar or primary counter-flashing)
1. applied as a “surface reglet” must be hemmed, broken, and sealed, as described above in this Article, and
2. must be secured with fasteners spaced no more than 304.8 mm (12”) O.C., but this spacing may be increased to no more than 609.6 mm (24”) O.C., provided the flashing maintains continuous contact with the substrate (See Article 13.3.2.1.).
Base flashings
1. must “kick out” minimum 50.8 mm (2") over insulation and filter fabric (filter fabric must be tucked up behind the base flashing),
2. must be secured with fasteners spaced no more than 304.8 mm (12”) O.C., and
3. may be fashioned as one piece, or as a 2-piece flashing that includes a lower, detachable segment to facilitate roof maintenance.
Linear metal flashing secured in a reglet (cut groove) must be
1. installed above the membrane flashing,
2. inserted at least 12.7 mm (1/2”),
3. friction-fitted within the reglet or secured on the exposed face with an acceptable fastener, and
4. sealed with a continuous bead of tooled gunnable sealant.
Where parallel and overlapping reglet flashings are used, the joints between flashing segments must be offset by at least 304.8 mm (12”), except at corners.

13.3.2.4. Metal Edge Terminations

Metal edge terminations (including "gravel stop" flashings) are integrated into the membrane system and therefore shall be installed to conform to Article 10.3.4.2.

13.3.2.5. Canted Edges

Metal flashings on canted edges must be face-fastened on the exterior face of the flashing or, when the height of the canted edge permits, at least 88.9 mm (3-1/2”) above the drainage plane.
Flashing must be secured with cladding fasteners, evenly spaced between seams along each length of flashing, using no fewer than
1. three (3) fasteners for every 3048 mm (120") length of metal flashing, or
2. two (2) fasteners for every 2438.4 mm (96") length of metal flashing.

Part 14 - The Roof as a Platform

Section 14.1. Design

(This Part covers the design and installation requirements for roofs that support an overburden, which may be structurally supported or directly supported by the roof assembly)

(See Note A-14.1.)

14.1.1. General

14.1.1.1. Scope

The scope of this Part and the Standard shall be as described in Division A, Part 1.

14.1.1.2. Defined Terms

Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
1. Roof Coverings means (without limitation) gravel, wearing surfaces, Vegetated Roof Systems, pavers, cast-in-place concrete, rubberized surfaces, broadly covering and directly superimposed on the roof assembly.
2. Structures and Equipment means structurally supported or portable objects including (without limitation) wood or composite decks and walkways, planters, "amenity spaces" (inclusive of furnishings, hot tubs, gazebos, pergolas, and play areas), nets and wind screens, photovoltaics, satellite equipment, light standards, lightning rods, sculptures, pools, and other water features.

14.1.2. Guarantee Term Requirements

14.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.

14.1.2.2. RoofStar 15-year Guarantee

To qualify for a RoofStar 15-year Guarantee, all projects shall comply with the requirements in this Part for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee.

14.1.2.3. RoofStar Vegetated Roof Guarantee

To qualify for a RoofStar Vegetated Roof Guarantee, the supporting roof assembly shall
1. comply with the requirements in this Part for a RoofStar 5-year Guarantee or a RoofStar 10-year Guarantee,
2. be acceptable to the manufacturer as support for a vegetated roof system, and
3. comply with the related requirements in the “RGC Standard for Vegetated Roofs”.

14.1.3. All Systems

14.1.3.1. Coverage and Limitations

Coverage under the RoofStar Guarantee shall be as described in Division A, Article 3.2.1.2.

14.1.3.2. Loads

The building structure must be designed to support any live loads specified by the Code having jurisdiction, including loads from any covering, amenity space, structure, or live loads superimposed upon the roof system.
Roof assemblies
1. must be designed as a protected roof system when they cannot support the superimposed loads described above (See also Article 8.1.4.1.).
2. must be designed as a protected roof system when the roof covering is
  1. a semi-intensive vegetated roof system, or
  2. an intensive vegetated roof system (See Article 1.1.3.2., “RGC Standard for Vegetated Roofs”).
3. should be designed as a protected roof system when the roof covering or living (amenity) space
  1. exceeds 152.4 mm (6”) in depth,
  2. includes cast-in-place concrete surface,
  3. is installed over a podium roof area adjacent to residential high-rise structures,
  4. includes water features or pools, or
  5. includes expansive terrace areas or play spaces.
When the superimposed load is a vegetated roof system, the design of the supporting roof assembly shall conform to the requirements in Article 1.1.3.1. and Article 1.1.3.2. of the “RGC Standard for Vegetated Roofs” and shall take into consideration the future loads from a mature, fully saturated vegetated roof.
Structural supports (i.e., curbs) should be considered to bear heavier dead loads, to resist Specified Wind Loads, or to secure the equipment during seismic events.

14.1.3.3. Securement of Roof Coverings, Structures, and Equipment

The Design Authority is responsible to specify the appropriate securement design of roof coverings, structures, and equipment, to resist Specified Wind Loads.
Vegetated roof systems shall be secured in keeping with the requirements of the “RGC Standard for Vegetated Roofs” .
Where structural securement is desirable or required,
1. structural supports must be fully waterproofed (curbs, sleepers, posts) and
2. the superimposed structure or equipment must be secured to the structural support at least 203.2 mm (8”) above the drainage plane (See Part 12,"Penetrations and Curbs", and Part 3, "Securing the Roof Assembly").

14.1.3.4. Design for Repairs and Renewal

Each design should, without limitation, include consideration for
1. the inevitability of roof repairs or replacement,
2. access for maintenance, and
3. material removal, storage, and replacement logistics.

14.1.3.5. Reserved

14.1.3.6. Membrane Protection

Membranes must be protected from damage incurred
1. during the construction of a building,
2. from normal use and occupancy of the roof, and
3. from maintenance of any installation on top of a roof system, after the building has been commissioned.
To prevent accidental damage and puncture from falling objects, conventional insulated systems at elevations lower than those designed for human occupancy should include a protective wearing course or, in the alternative, should be designed as a protected roof system.
Where membranes installed on vertical surfaces may be damaged from foot traffic or shifting coverings, they must be protected (i.e., with base metal flashing; ref. Article 13.1.3.6.).

14.1.3.7. Membrane Integrity Testing and Electronic Leak Detection

(See Article 1.1.3.3. and Article 1.1.3.4.)

14.1.3.8. Drainage

Roofs designed as platforms to support roof coverings, amenity spaces, or equipment must promote unimpeded drainage of storm or irrigation water.
The drainage of a roof assembly supporting a vegetated roof system shall be designed in coordination with the design requirements in the “RGC Standard for Vegetated Roofs” .
Where a roof covering material naturally drains (i.e., gravel), no additional drainage design is required, but when it does not naturally drain, the design must incorporate a drainage plane on top of the completed roof system.
Overburden must be contained with drain guards, rigid barriers, and filter fabric (See also Article 11.3.2.3.).
To facilitate the adequate movement of water and minimize or prevent damming when non-structural supports are oriented perpendicular to (across) the direction of drainage, the design must
1. specify shorter supports, to a maximum length of 1219.2 mm (48"), and
2. incorporate drainage mats beneath supports longer than 1219.2 mm (48") in any direction.
Equipment installed on structural supports, or on top of the roof system, must be spaced or located to promote access to drains, ease of maintenance, and worker or occupant safety.

14.1.3.9. Filter Fabric

Filter fabrics are required when the roof supports
1. a vegetated roof system (See Part 6 in the “RGC Standard for Vegetated Roofs”),
2. sand and other fine materials,
3. gravel with a diameter less than 12.7 mm (1/2”),
4. wet mortar or concrete, or
5. XPS insulation above the membrane (See Note A-14.1.3.9.).

14.1.3.10. Gravel

(See Note A-14.1.3.10.)

When smooth stone (aggregate rock) is specified as the roof covering (different from ballast),
1. only washed gravel may be used, and
2. the design must include gravel guards around roof drains.
When the gravel used as a roof covering is crushed, or is smaller than 12.7 mm (1/2”),
1. a geotextile protection layer must be installed immediately above the roof membrane, and
2. the crushed gravel must be deep enough to hold the geotextile protection layer in place.

14.1.3.11. Wearing Surfaces

(See also Article 9.1.3.4. concerning wearing surfaces and drainage requirements)

Any wearing surface may be installed on an uninsulated system, provided
1. the compressive strength of the insulation will support it,
2. insulation is covered with a suitable overlay (See Article 8.1.4.1.),
3. the wearing surface does not bond with or touch the roof field membrane or membrane flashing, and
4. drainage of storm or irrigation water is not impeded.
When a wearing surface is specified,
1. it must incorporate measures to protect the roof membrane from damage,
2. perimeter membranes and penetrations must be protected from abrasion by the wearing surface,
3. the design must provide a drainage space below the wearing surface measuring at least 12.7 mm (1/2”) in depth, and
4. the design must provide a vertical drainage gap between the wearing surface and any openings.
When cast-in-place concrete is specified as the wearing surface (See Note A-14.1.3.11.), the design must conform to the other requirements in this Article, and the concrete must be separated from the membrane with
1. a bond-breaking material, such as a proprietary drainage mat or XPS insulation, and
2. filter fabric or a barrier material acceptable to the membrane manufacturer, able to prevent the concrete slurry from reaching the membrane.

14.1.3.12. Vegetated Roof Systems

Vegetated Roof Systems (VRS) must be designed to meet the requirements in the “RGC Standard for Vegetated Roofs”; this includes membrane protection, drainage, water retention materials, filter fabrics, etc.

14.1.3.13. Structures and Equipment

Non-structural installations superimposed on a roof assembly
1. are recommended for smaller installations, to
  1. minimize the number of penetrations, curbs, or sleepers necessary for structural securement,
  2. eliminate possible weak points in the roof system, where a leak may occur,
  3. avoid dedicated mechanical drainage, and
  4. simplify removal of materials when membrane repairs are required.
2. must take into account inevitable roof renewal (see Note A-14.1.3.13.),
3. must be placed on an appropriate protection layer or supported by pedestals, pavers, or other means of distributing weight and point loading, and
4. may be placed on an insulated roof system provided the insulation will support all anticipated dead loads, live loads and point loads (See Article 14.1.3.2., "Loads").
Structurally supported installations that are
1. cast-in-place must be constructed on a pre‐curb that is continuously waterproofed as part of the primary roof membrane and waterproofed independently of the primary roof membrane.
2. pre-cast must be secured
  1. to a pre‐curb that is continuously waterproofed as a continuation of the primary roof membrane, or
  2. to structural supports that are waterproofed in keeping with the requirements in Part 12.
When concrete walls or structures are constructed without a pre-curb, all concrete surfaces must be fully and continuously enveloped with the primary roof membrane (See also Division A, Article 3.2.1.2.).
Pre‐curbs must be
1. at least 101.6 mm (4") in height above the drainage plane of the highest adjacent roof assembly,
2. completely enveloped with fully adhered acceptable membrane flashing (including all faces of drainage knock‐outs), and
3. properly waterproofed around dowels in their final position, using
  1. a 2-component catalyzed polymethyl methacrylate (PMMA) or polyurethane methyl methacrylate (PUMA) reinforced liquid membrane flashing system, or
  2. two cured coats of an Accepted polyurethane or silicon-based single-component liquid flashing system (See Article 12.3.2.6., "Liquid Membrane Flashing").
When a structural planter adjoins a protected roof system, the planter design must include
1. a plumbed mechanical drain, inclusive of
  1. a plumbed mechanical drain , or
  2. When a structural planter adjoins an insulated roof system, only a plumbed mechanical drain is permissible.
  3. A design review is advisable when a structural water feature incorporates penetrations for wiring, lights, or other submerged features.
  4. Tiles or other architectural finishes may be applied to the waterproofing membrane, subject to a written Variance from the Guarantor and approval by the membrane manufacturer (See Article 1.1.3.6., "Variances").
  5. Drains, re-circulation inlets, and outlets used in water features, must include clamping rings, and must be sealed to the membrane assembly.
  6. When a leak detection system is specified, only non‐ferrous metal drains may be used.
  Section 14.2. Materials
  
  14.2.1. Material Properties
  
  14.2.1.1. Field and Flashing Membranes
  1. Refer to Article 9.2.1.1. for field membrane composition, thickness, and selection.
  2. Single and 2-component liquid membrane flashing systems used on any detail, including pre-curbs, must be listed in Division C, and must be proprietary to, or accepted by, the manufacturer.
  14.2.1.2. Membrane Protection
  1. Refer to Article 9.3.2.7.
  14.2.1.3. Reserved
  
  14.2.1.4. Drainage and Water Retention Materials
  1. Drainage mats, geo-synthetic drainage cores, and geo-composites used beneath any non-vegetated overburden, must be
    1. acceptable to the manufacturer,
    2. suitable for the installed roof covering,
    3. selected for their ability to support dead loads, live loads, and point loads, and
    4. capable of permitting the anticipated flow rate of water.
  2. Moisture retention and reservoir layers must be acceptable to the manufacturer/supplier of the Vegetated Roof System.
  14.2.1.5. Insulation and Insulation Overlays
  
  (See Part 7, "Insulation", and Part 8, "Insulation Overlays")
  1. When XPS (with or without a concrete topping) is specified as the drainage layer, it must be grooved (by the manufacturer, or as a post-manufacturing alteration).
  2. Insulation and insulation overlays must have a minimum load carrying capacity of 110 Kpa (20 psi), but in any event must be capable of supporting any loads superimposed on the membrane, without compression or distortion of the roof system or any one of its components.
  14.2.1.6. Filter Fabric
  1. Filter fabrics must be
    1. acceptable to the manufacturer,
    2. suitable for the installed roof covering,
    3. selected for their ability to support dead loads, live loads, and point loads, and
    4. capable of permitting the anticipated flow rate of water.
  2. The properties, composition, and supply of filtration fabrics used in a vegetated roof system shall conform to the requirements in Article 6.2.1.2. of the “RGC Standard for Vegetated Roofs”.
  3. Fabric filter mats must be
    1. water permeable and have proven long term weather resistance, and
    2. strong enough to withstand traffic abuse and prevent displacement of insulation boards under flotation conditions.
  14.2.1.7. Decorative Gravel
  1. Decorative gravel (aggregate) (See Note A-14.1.3.10.) must be washed and may be smooth or crushed.
  2. Large grade gravel may withstand wind scour more effectively than smaller gravel, but the Design Authority must determine the gradients, based on the Specified Wind Loads for the roof (See also Article 3.2.2.3., Gravel Ballast).
  14.2.1.8. Pavers and Pedestals
  1. Pavers that are partially supported (i.e., with pedestals) must be capable of resisting anticipated loads.
  2. Pedestals
    1. should be adjustable when a level surface is required, and
    2. must be purpose-made and include an integral spacer rib no more than 4.76 mm (1/8”) wide, to uniformly separate pavers.
  Section 14.3. Application
  
  14.3.1. Guarantee Term Requirements
  
  14.3.1.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee
  1. To qualify for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee, all projects shall comply with the requirements in this Part.
  14.3.1.2. RoofStar 15-year Guarantee
  1. To qualify for a RoofStar 15-year Guarantee, all projects shall comply with the requirements in this Part for a RoofStar 5-year Guarantee or RoofStar 10-year Guarantee.
  14.3.2. All Systems
  
  14.3.2.1. Membranes and Membrane Protection
  1. Membranes and membrane flashing must be installed in keeping with the requirements found elsewhere in this Standard.
  2. Protection of roof membranes from mechanical damage caused by tools, accident or the work of others is mandatory during the installation and maintenance of any roof covering or living space (See also Article 9.1.3.4., "Membrane Protection", for related requirements).
  14.3.2.2. Filter Fabric
  1. Fabric filter rolls used in any system other than a vegetated roof system must be
    1. at least 2489.2 mm (98") wide,
    2. installed loose-laid (un-bonded) over the insulation and below any type of ballast or roof covering,
    3. overlapped at all edges a minimum of 304.8 mm (12"),
    4. slit to fit over roof penetrations,
    5. cut out around roof drains and other openings,
    6. carried up all vertical transitions (including penetration flashings) above the finished roof system surface at least 76.2 mm (3”), and
    7. loosely held in place at all perimeter edges and curbs, behind metal counter flashings or wall finishes, and
    8. secured around penetration flashings.
  14.3.2.3. Drainage
  1. The location of the drainage layer(s) shall conform to the requirements in Part 7.
  2. A second drainage layer may be installed above the insulation, but this is at the discretion of the Design Authority.
  3. Specialized proprietary drainage products must be acceptable to the manufacturer.
  14.3.2.4. Decorative Gravel
  1. When gravel (aggregate) is specified as a roof covering, only washed gravel may be used.
  2. Ballast guards must be installed around all roof drains (See Article 11.3.2.3.).
  3. Crushed gravel specified as a roof covering must be
    1. installed over a geotextile protection layer, or its equivalent, when the gravel is crushed or smaller than 12.7 mm (1/2”) in diameter, and
    2. must be applied in quantities sufficient to hold down the protection layer against displacement by wind.
  14.3.2.5. Wearing Surfaces
  1. Pavers and unit-type masonry, such as brick or stone, must be supported by
    1. proprietary (purpose-made) pedestals with at least a 4.76 mm (1/8”) integral spacer ribs for uniform spacing of pavers,
    2. a proprietary drainage layer overlaid with a filter fabric mat, or
    3. a drainage layer of loose aggregate (such as pea gravel) measuring at least 25.4 mm (1") in depth, installed over a filter fabric.
  2. Pedestals, or a drainage layer,
    1. must permit at least 12.7 mm (1/2″) of vertical separation between the paver and the underlying substrate, to provide airflow for drying surfaces and assist in leveling, and
    2. should not impede the flow of water or air, and should uniformly distribute the dead load of pavers, and other unit masonry products, as well as predicted live loads.
  3. Cast-in-place concrete installed directly above the roof membrane must be separated from the membrane and its protection layers with material and a filter fabric or barrier material specified by the Design Authority and conforming to the requirements in Article 14.1.3.11.
  14.3.2.6. Vegetated Roof Systems
  
  (See Note A-14.3.2.6.)
  1. All Vegetated Roof Systems must be installed according to the requirements in the “RGC Standard for Vegetated Roofs”.
  14.3.2.7. Structures and Equipment
  1. Structural installations (i.e., planters, pools, ponds, or water courses) must be constructed with
    1. a pre‐curb (start‐up curb), onto which the installation is formed and poured, or
    2. full-height walls that are formed and poured in direct contact with the structural deck.
  2. Pre‐curbs ( Figure 14.3.2.7.-A ) must
    1. achieve a finished height at least 101.6 mm (4") above the drainage plane of the highest adjacent roof assembly (For an example of this see Construction Detail "Structural Planter"), and
    2. be completely enveloped with fully adhered acceptable sheet or liquid membrane flashing (including all faces of drainage knock‐outs).
  3. All planters and water features must be fully waterproofed on the inside; sheet membrane installation must conform to the requirements in Article 10.3.2.3., and liquid membrane flashing shall conform to the requirements in Article 10.3.3.4.
  4. All membrane flashing shall terminate
    1. on the outside face of the planter wall, at least 50.8 mm (2”) below the upper edge, or
    2. on the inside face of the planter wall with a cut reglet linear metal flashing, caulked with sealant and installed no less than 50.8 mm (2”) above the top surface of growing media.
  5. Structural installations that do not incorporate pre-curbs must be
    1. flashed to cover the complete exterior surface with roof membrane, or
    2. flashed with sheet membrane that is installed, terminated, and protected to conform to Article 10.3.2.3.
    Figure 14.3.2.7.-A Pre-curbs and Sheet Membrane Flashing
    Forming Part of Article 14.3.2.7.
    (Click to expand illustration)
  6. Dowels (reinforcement bar) must be
    1. inserted into the pre‐curb after application of the membrane flashing, and
    2. waterproofed in their final position, where they penetrate the pre-curb.
  7. Dowels must be waterproofed with
    1. a single application of an accepted, fleece-reinforced 2-component liquid membrane flashing, or
    2. two (2) applications of a single-component liquid membrane flashing,
      1. applied to properly prepared surfaces,
      2. fully cured between coats,
      3. in keeping with the application requirements in Article 10.3.3.4., for 2-component reinforced liquid membrane flashing, or the manufacturer’s instructions, when using a single-component liquid membrane flashing, and
      4. applied no less than 50.8 mm (2”) on vertical surfaces and in a radius around the base of each dowel.
  8. When structures or equipment exceed the limits stated in Division A, Article 3.2.1.2., a membrane integrity scan and any resulting repairs must be undertaken before the membrane is covered.
  Notes to Standard

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(Draft) Hot Rubber Roof Systems Standard

(Draft) Hot Rubber Roof Systems Standard

Contents

Accept Terms Of Use

Part 1 - General

Section 1.1. Design

1.1.1. General

1.1.1.1. Scope

1.1.1.2. Coverage and Limitations

1.1.1.3. References

1.1.1.4. Defined Terms

1.1.1.5. Reserved

1.1.1.6. Objectives

1.1.1.7. Responsibility for Design

1.1.1.8. Pre-Design Requirements

1.1.1.9. Suitability of Design

1.1.2. Guarantee Term Requirements

1.1.2.1. RoofStar 5-Year Guarantee and RoofStar 10-year Guarantee

1.1.2.2. Reserved

1.1.2.3. Quality Control

1.1.2.4. Quality Assurance

1.1.3. All Systems

1.1.3.1. Permitted Roof Systems

1.1.3.2. Accessibility for Maintenance

1.1.3.3. Membrane Integrity Testing

1.1.3.4. Electronic Leak Detection

1.1.3.5. Hot Works

1.1.3.6. Variances

1.1.4. Replacement and Alterations

1.1.4.1. General Requirements

1.1.4.2. Complete Roof System Replacement

1.1.4.3. Reserved

1.1.4.4. Reserved

1.1.4.5. Tie-ins, Additions, and Alterations to Existing Roofing

1.1.5. Reserved

Section 1.2. Reserved

Section 1.3. Application

1.3.1. Reserved

1.3.2. All Systems

1.3.2.1. Hot Works: Contractor Requirements

1.3.2.2. Workmanship

1.3.2.3. Contractor Qualifications

1.3.3. Replacement and Alterations

1.3.3.1. General Requirements

1.3.3.2. Complete Roof System Replacement

1.3.3.3. Partial Roof Replacement

1.3.3.4. Reserved

1.3.3.5. Tie-ins, Additions, and Alterations to Existing Roofing

1.3.3.6. Repairs and Modifications

1.3.4. Reserved

Part 2 - Supporting Structures: Decks and Walls

Section 2.1. Design

2.1.1. General

2.1.1.1. Scope

2.1.1.2. Defined Terms

2.1.2. Guarantee Term Requirements

2.1.2.1. RoofStar 5-year Guarantee and RoofStar 10-year Guarantee

2.1.2.2. RoofStar 15-Year Guarantee

2.1.3. All Systems

2.1.3.1. General Requirements for Roof Slope

2.1.3.2. Roof Slope for New Construction

2.1.3.3. Roof Slope for Replacement Roofing

2.1.3.4. Deck Condition and Suitability for Roofing

2.1.3.5. Drainage Around Obstructions

2.1.4. Reserved

2.1.5. Roof Decks

2.1.5.1. Steel Roof Decks

2.1.5.2. Concrete Roof Decks

2.1.5.3. All Wood Roof Decks

2.1.5.4. Plywood Roof Decks

2.1.5.5. Mass Timber Roof Decks

2.1.5.6. Non-veneered Panel Roof Decks

2.1.5.7. Wood Board Roof Decks

2.1.6. Reserved

2.1.7. Walls

2.1.7.1. General

2.1.8. Electrical Cables and Boxes

2.1.8.1. New Construction

2.1.8.2. Roof Replacement and Alterations

Section 2.2. Materials