ASM Roof Systems Standard

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ASM Roof Systems Standard




Contents

Division B - Standards


Standard for Architectural Sheet Metal (ASM) Roof Systems

About the Standard

This Standard is a consolidation of requirements previously published in the Roofing Practices Manual for Architectural Metal Roofing (Tab 8). It 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.

A PDF copy of this Standard is available for download. While every effort is made to ensure the accuracy of the printable version, only the online version of this Standard shall be considered valid.
Standard for ASM Roof Systems



First Edition: June 14, 2018
Previous Edition: June 16, 2022
Current Edition: Adopted October 21, 2022

All changes to this Standard are effective
November 7, 2022

© RCABC 2022
No reproduction of this Standard, in whole or in part, is lawful without the expressed permission of the RGC Guarantee Program.

Part 1 - General

Section 1.1. Design

1.1.1. General

1.1.1.1. Scope

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

1.1.1.2. Coverage and Limitations

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

1.1.1.3. References

  1. 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, and
    3. measurements are shown in metric units first, followed by Imperial values (typically in parentheses; see Division A, Article 2.1.3.2., "Measurements").

1.1.1.4. Definitions

  1. 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 flashings are flashings cut and shaped from flat metal stock, to redirect water at roof perimeters and edges, and are used in valleys and drainage spillways.
    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. 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”).
    8. 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").

1.1.2. Guarantee Term Requirements

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

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

1.1.2.2. RoofStar 15-Year Guarantee

  1. To qualify for a RoofStar 15-year (Waterproofing Roofs) Guarantee, each project must be designed and constructed in compliance with the requirements published in this Standard, including the following standards which are linked to their referenced Parts:
    1. A minimum slope of 1:6 (2” in 12”) is mandatory ( Article 2.1.2.2.).
    2. Only panels with a hidden clip securement system may be used to qualify for a RoofStar 15-year Guarantee. Flange-fastened panels are not permitted ( Article 9.1.2.2.).
    3. All penetrations must be flashed by using the split panel detail; flexible boot flashings secured with gasketed screws are not permitted ( Article 12.1.2.2.).
    4. All penetration flashings that do not incorporate a settlement cap must be fitted with two storm collars separated by no more than 75 mm (3”), and each storm collar must be sealed with an untooled bead of sealant (Article 12.1.2.2.).

1.1.3. All Systems

1.1.3.1. Permitted Roof Systems

(See Note A-1.1.3.1.)

  1. This Standard applies to new construction, and to the partial or complete replacement of existing roofs, constructed as
    1. uninsulated systems in which metal panels are secured directly to the roof deck or an overlay, and
    2. insulated systems, in which metal panels are installed above insulation and other roof system materials, and secured to the roof deck using thermally non-conductive clips, girts, or bearing plates.
  2. Architectural metal roofing systems accepted for use in the RoofStar Guarantee Program must be roll-formed hydrokinetic (water-shedding) systems commonly installed over solid roof decks or rigid insulation panels, but may also be intermittently supported when engineered to resist anticipated live loads (metal panels designed for use as structural (spanning member) systems are accepted for a RoofStar Guarantee only as an architectural metal panel system).

1.1.3.2. Snow Loads

  1. In this Standard, a high snow load area is considered a regional area with a Specified Snow Load higher than 3.5 kPa (See Note A-1.1.3.2.).
  2. Roofs subject to high snow loads must be designed with a supporting deck structure thick enough to support the anticipated live loads, within the acceptable deflection limits defined by the "British Columbia Building Code".
  3. Consideration should be given to
    1. slope,
    2. entrances and exits,
    3. penetrations,
    4. valley construction,
    5. proper intake and exit ventilation, irrespective of snow cover and drifting, and
    6. penetrations and their functionality.
  4. Roofs subject to high snow loads should be designed
    1. with full support for metal panels,
    2. with generous slope to shed snow from the roof surface (a slope of at least 1:1.5 (8” in 12”) is strongly recommended),
    3. to utilize a RoofStar-accepted self-adhered eave protection membrane as underlayment over the entire deck surface, regardless of slope and the requirements published elsewhere in this Standard,
    4. with widening valleys (from peak to eave),
    5. so that penetrations are located near the ridge line, and
    6. to utilize snow fences or guards (if so required by the Design Authority) only where a hazard to the public exists; in all other instances it is preferable to allow snow to freely discharge from the roof, to avoid disfigurement and damage to the roof system.

1.1.3.3. Ventilation

  1. Roofs that do not provide adequate ventilation do not qualify for a RoofStar Guarantee.
  2. The design and selection of the ventilation system is the responsibility of the Design Authority, and may be achieved by incorporating into the roof design both intake and exhaust vents, including (without limitation),
    1. eave vents,
    2. gable end vents,
    3. hip vents,
    4. static vents,
    5. ridge vents, or
    6. cupolas
  3. Attic (roof cavity) ventilation must meet the minimum requirements set out by the Code having jurisdiction, even in conditions where snow cover is present (See the "British Columbia Building Code", Division B, Article 9.19.1.3., "Clearances").
  4. Ventilation must be suitable for
    1. the slope of the roof,
    2. the vented area, and
    3. the design and configuration of the roof structure.
  5. Ventilation must be provided for
    1. roofs over cathedral ceilings, and
    2. compact insulated roof assemblies.
  6. Continuous ridge venting systems
    1. are acceptable and are recommended for all areas with vaulted ceilings, and
    2. may be installed on slopes 1:3 (4” in 12”) and greater, but application on slopes less than 1:3 must be permitted by manufacturer’s published installation instructions.

1.1.3.4. Reserved

1.1.3.5. Hot Works

(See Note A-1.1.3.5.)

  1. 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.).
  2. 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

  1. When a design is unable to conform to the Standard, the Design Authority may apply to the RGC for a written Variance.
  2. 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.
  3. Variances are issued by the RGC only to the Design Authority and will be distributed to the Contractor.
  4. 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.
  5. 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

  1. Unless expressly permitted otherwise in this Standard,the design for replacement roofing shall conform to the requirements for new roofing in this Standard.
  2. New metal panels and flashing, together with existing rainwater gutters, must be protected from incidental damage including, without limitation, damage caused by ladders.
  3. Existing self-adhered eave protection membrane may be left in place but must be covered with a new layer of RoofStar-accepted membrane, in keeping with the requirements in this Standard.

1.1.4.2. Complete Roof System Replacement

  1. Complete roof system replacement shall conform to the general requirements in Article 1.1.4.1., unless expressly varied elsewhere in this Standard.
  2. 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.
  3. 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.
  4. 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

  1. 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; the curb must be
    1. at least 127 mm (5”) in height, and
    2. sealed and flashed in keeping with the requirements for curbs ( Article 12.3.2.4.).
  2. 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.); any alternative design must
    1. include design specifications and construction details showing a positive water cut-off that fully isolates the existing roof from the new roof, and
    2. show how the new roof system will be easily distinguishable from the existing roof system.
  3. 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).
  4. 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.

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. 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-1.3.3.2.)

  1. The Contractor must take reasonable measures to protect the project from damage by the weather, during and at the completion of the project.
  2. 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

  1. Supervision, manufacturing, and installation of a RoofStar-guaranteed Architectural Sheet Metal Roof System shall be undertaken only by established employees of Contractors, each having obtained a valid
    1. Architectural Sheet Metal Journeyperson Certificate of Qualification, or
    2. Sheet Metal trade ticket, together with at least five (5) years of documented experience installing and supervising the installation of ASM roofing (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

  1. Unless expressly permitted otherwise in this Standard, all replacement roofing shall conform to the requirements for new roofing in this Standard.
  2. New metal panels and flashing, together with existing rainwater gutters, must be protected from incidental damage including, without limitation, damage caused by ladders.
  3. Existing self-adhered eave protection membrane may be left in place but must be covered with a new layer of RoofStar-accepted membrane, in keeping with the requirements in this Standard.

1.3.3.2. Complete Roof System Replacement

  1. 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

  1. 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 and Additions to Existing Roofing

  1. 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; the curb must be
    1. at least 127 mm (5”) in height, and
    2. sealed and flashed in keeping with the requirements for curbs ( Article 12.3.2.4.).
  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

  1. 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. eaves, valleys, and underlayment ( Part 8),
    6. metal panels ( Part 9),
    7. perimeter details ( Part 10),
    8. drains ( Part 11),
    9. penetrations and curbs ( Part 12), and
    10. linear metal flashings ( Part 13).
  2. 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

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

2.1.1.2. Definitions

  1. 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 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. 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).
    7. 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).
    8. 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").
    9. 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.

2.1.2. Guarantee Term Requirements

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

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

2.1.2.2. 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 or RoofStar 10-year Guarantee, and shall
    1. be designed with a minimum slope of 1:6 (2” in 12”), which may not be reduced through a written Variance (Note: curved or barrel-shaped roofs may be permitted under a written Variance, subject to a review by the Guarantor).

2.1.3. All Systems

2.1.3.1. General Requirements for Roof Slope

  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.
  2. Throughout this Standard, the defined terms of Article 2.1.1.2. apply (See Figure 2.1.3.-A for an illustrated guide to the above definitions).
  3. Roofs with designed slopes less than the stated minimums in Article 2.1.3.2. and in Article 2.1.3.3. (i.e., curved applications; see also Article 9.1.3.4.) will be considered for a RoofStar Guarantee provided
    1. the design and installation details are submitted in writing to the Guarantor prior to the tendering of documents, and
    2. a written Variance is issued by the Guarantor prior to close of tender.
Figure 2.1.3.-A (Click to expand)
2.1 Slope illustration.jpg

2.1.3.2. Roof Slope for New Construction

  1. Roofs with a designed slope
    1. equal to or greater than 1:6 (2" in 12") do not require a written Variance from the Guarantor and must be designed to conform to the requirements in this Standard, howsoever they apply,
    2. less than 1:6 (2" in 12")
      1. are permissible only through a written Variance from the Guarantor,
      2. shall be designed to conform to the requirements in this Standard, and
      3. shall comply with any and all requirements or conditions stipulated in the Variance.
  2. When the designed slope is less than 1:4 (3" in 12"), the engineered shop drawing package must be accompanied by manufacturer’s literature confirming that this application is acceptable.
  3. A minimum slope of 1:6 (2” in 12”) is a requirement for a RoofStar 15-year Guarantee (See Article 2.1.2.2.).

2.1.3.3. Roof Slope for Replacement Roofing

  1. The requirements in Article 2.1.3.1. and Article 2.1.3.2. apply to replacement roofing.

2.1.3.4. Deck Condition and Suitability for Roofing

  1. The Code having jurisdiction prevails in all cases except where it is exceeded by the requirements published in this Standard.
  2. 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.
  3. The supporting deck must be dimensionally stable, resist deflection from dead and live loads, and must be capable of accommodating roof system component movement.
  4. 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

  1. 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.)

  1. Steel decks must be acceptable to the roof system 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.)

  1. Direct contact between metal roofing and concrete, light concrete, stone and mortar must be avoided.
  2. The selection of a suitable underlay, insulation, and method of attachment to a concrete deck or wall is the responsibility of the Design Authority.

2.1.5.3. All Wood Roof Decks

(See Note A-2.1.5.3.)

  1. 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.
  2. 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.
  3. All wood decks shall be
    1. at least 15.88 mm (5/8") thick, and
    2. capable of the required pull-out resistance for expected fasteners (knotholes and cracks in decks shall be considered defects and must be covered with sheet metal, mechanically fastened in place),
  4. All mass timber or wood board decks must be covered with a properly secured, suitable overlay to
    1. ensure the integrity of the underlayment as mass timber elements contract and expand, and
    2. protect membranes from wood sap or deck surface irregularities and protruding fasteners; plywood and non-veneered panel decks are exempted from this requirement.
  5. Securement of overlaid sheathing shall conform to the requirements for wood decks in this Part.
  6. All types of wood decks should be roofed promptly after installation.

2.1.5.4. Plywood Roof Decks

  1. 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.
  2. All non-ferrous (i.e. copper, zinc) metal panel roof systems must be installed over tongue-and-groove plywood decks conforming to the minimum material properties and thicknesses stated in this Article.
  3. 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 15.88 mm (5/8") 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.

2.1.5.5. Mass Timber Roof Decks

  1. Mass timber decks, which include cross-laminated timbers (CLT), nail-laminated timbers (NLT), dowel-laminated timbers (DLT), and traditional glue-laminated timbers (Glulam), are acceptable to the Guarantor but must be overlaid with plywood conforming to the material requirements in Article 5.2.1.1.

2.1.5.6. Non-veneered Panel Roof Decks

  1. Oriented Strand Board (OSB) is not acceptable deck material for Architectural Sheet Metal panel roof systems .

2.1.5.7. Wood Board Roof Decks

  1. Wood board decks
    1. must be overlaid with plywood in keeping with the general requirements for wood decks in Article 2.1.5.3., and
    2. must be removed and replaced with new material when they are damaged or excessively cupped (excessive cupping is considered 25.4 mm (1”) or more when measured against the mid-span deflection of the deck).

2.1.6. Expansion and Control Joints

2.1.6.1. Reserved

2.1.6.2. Control Joints

(See Note A-2.1.6.2.) (See also Construction Details and Article 10.3.6.2. concerning membrane application.)

  1. The Design Authority is responsible
    1. to determine the need for control joints (roof dividers), and
    2. to specify their location and design.
  2. 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.).

2.1.7. Walls

(See Note A-2.1.7.)

2.1.7.1. General

  1. Wall surfaces must be clean, dry, and smooth, suitable for the application of roof system materials.
  2. Wood or steel-stud walls must be sheathed with a material suitable for adhering membranes and securing metal flashings.
  3. Sheathing, defined as a rigid panel material secured directly onto framing, is considered a wall surface for the purpose of this Standard.
  4. Wall surfaces 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.).

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

  1. Electrical cables, raceways or boxes shall not be installed within a roof assembly (Figure 2.1.8.-A).
  2. 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.-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.-C).
  3. 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.
  4. Electrical cables installed above the roof assembly should be elevated to permit proper support, roof maintenance and future replacement roofing (Figure 2.1.8.-D).
Figures 2.1.8.-A (Click to expand)
Figure 2.7.1-1.jpg
Figures 2.1.8.-B (Click to expand)
Figure 2.7.1-2.jpg
Figures 2.1.8.-C (Click to expand)
Figure 2.7.1-3.jpg
Figures 2.1.8.-D (Click to expand)
Figure 2.7.1-4.jpg


2.1.8.2. Roof Replacement and Alterations

  1. 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".
  2. 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

  1. 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”).
  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 and RoofStar 10-year Guarantee

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

2.3.1.2. 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 or RoofStar 10-year Guarantee, and shall
    1. be constructed with a minimum slope of 1:6 (2” in 12”).

2.3.2. All Systems

2.3.2.1. Construction of Decks and Walls

  1. 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

Section 3.1. Design

3.1.1. General

3.1.1.1. Scope

(See Note A-3.1.1.1.)

  1. The scope of this Part and the Standard shall be as described in Division A, Part 1.
  2. This Part applies to all new roofs, and to both full and partial replacement roof systems.
  3. This Part sets out the requirements for
    1. roofs that support overburden, or fixed amenities and equipment, and
    2. roofs where only part of the system must be replaced.

3.1.1.2. Intent

(See Note A-3.1.1.2.)

  1. 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

  1. 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.
  2. 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.
  3. 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. the "British Columbia Building Code", Division B, Appendix C, "Table C-1").

3.1.1.4. Definitions

  1. Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
    1. Registered Professional has the same meaning as that used in the "British Columbia Building Code", Division C, Section 2.2., "Administration".
    2. 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", Division B, Part 4, Section 4.1., "Structural Loads and Procedures".

3.1.2. Guarantee Term Requirements

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

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

3.1.2.2. 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 or RoofStar 10-year Guarantee.

3.1.3. All Systems

3.1.3.1. Responsibility for Design

  1. 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.
  2. 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

  1. A registered professional "skilled in the work concerned" must perform or validate the calculation of Specified Wind Loads (See the "British Columbia Building Code", Division C, Part 2, Section 2.2., "Administration": Article 2.2.2.2., Structural Design), using
    1. the "Wind Uplift Resistance Calculator" (formerly "Wind-RCI"), or
    2. the formulae and procedures in the "British Columbia Building Code", Division B, Part 4, Subsection 4.1.7.,"Wind Load" (See Note A-3.1.1.1.).
  2. Each roof area, at each level (elevation), shall be divided into three principal roof zones (Figure 3.1.), and the Design Authority shall be responsible for calculating the Specified Wind Loads for each zone (Ref. the "British Columbia Building Code", Division B, Part 4, Article 4.1.7.6., "External Pressure Coefficients for Low Buildings").
  3. 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.-A).
    Figure 3.1.3.-A (Click to expand)
    Figure 3.1.-A Water-shedding Systems 2.jpg


  4. 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.-B).
  5. 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’) (Ref. Figure 3.1.3.-B).
  6. 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.-B (Click to expand)
    Figure 3.1.-B Water-shedding Systems.jpg


  7. 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 3.2.).
  8. 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 structures or equipment.
  9. 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").
  10. Mansards are a roof system and are therefore subject to the requirements in this Part.
  11. Securement of an adjoining waterproofing system shall be made in accordance with the requirements in the applicable Standard.

3.1.3.3. Resistance to Specified Wind Loads

  1. 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.).
  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. Each engineered design must include, without limitation, the following:
    1. Metal panel profile and gauge
    2. Type of clips
    3. Bearing plates
    4. Drag load components
    5. Fasteners (type, size and spacing)
    6. Roof assembly components (i.e. underlayment, insulation)
    7. Deck Substrate

3.1.3.4. Resistance to Other Loads

(See Note A-3.1.3.4.)

  1. 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.

3.1.3.5. Submittals

(See also Article 9.1.3.1.)

  1. The Guarantor must receive from the Contractor sealed engineered shop drawings conforming to the requirements in Article 3.1.3.3. and Article 3.1.3.4.

3.1.4. Insulated Roof Systems

3.1.4.1. Securement Against Specified Wind Loads

  1. New and fully replaced insulated systems shall satisfy the requirements of the "British Columbia Building Code" and this Part, and shall be secured with clips fastened to
    1. thermally non-conductive, intermediate or continuous supports that pass through the insulation assembly, or
    2. mechanically fastened bearing plates which are installed on the top surface of the insulation.

3.1.5. Uninsulated Roof Systems

3.1.5.1. Securement Against Specified Wind Loads

  1. Uninsulated systems shall be designed for securement directly to the roof deck.

3.1.6. Reserved

3.1.7. Roof Replacement and Alterations

3.1.7.1. Complete Roof System Replacement

  1. Complete roof system replacement projects must be designed to secure the new roof system against displacement by Specified Wind Loads and must follow the design requirements specified by the Design Authority.

Section 3.2. Materials

3.2.1. Reserved

3.2.2. Securement Materials

3.2.2.1. Fasteners

  1. 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.).
  2. Fasteners must be capable of securing the roof system components to resist Specified Wind Loads.
  3. Fasteners
    1. used to secure metal panels or clips shall conform to the requirements in Article 9.2.1.4., and
    2. used to secure linear metal flashings shall conform to the requirements in Article 13.2.1.3.

Section 3.3. Application

3.3.1. Guarantee Term Requirements

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

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

3.3.1.2. 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 or RoofStar 10-year Guarantee,

3.3.2. All Systems

3.3.2.1. Securing Systems with Mechanical Fasteners

(See Figure 3.2.)

  1. All metal panels must
    1. be secured to a firm support, and
    2. utilize concealed fasteners; exposed fastener securement is not acceptable.
  2. When clips are used to secure metal panels, the clips must be firmly supported and shall be secured by no fewer than two screw-type fasteners (Ref. Article 9.2.1.4. and Article 9.2.1.5.).
  3. Concealed fasteners should provide clearance for the underside of the metal panel and must be of a material compatible with the panel or metal clip.
  4. Regardless of where fasteners are used in the roof system, when they penetrate and secure another material to a substrate, mechanical fasteners must (unless exceeded by the fastener manufacturer’s published requirements)
    1. penetrate through the bottom surface of
      1. steel decks at least 19.05 mm (3/4") (fasteners should penetrate the top flutes only), and
      2. plywood sheathing by at least 19.05 mm (3/4").
    2. penetrate into solid dimensional lumber or concrete by at least 25.4 mm (1").
Figure 3.2.2.-A (Click to expand)
Figure 3.5.jpg

3.3.3. Insulated Roof Systems

3.1.4.1. Securement Against Specified Wind Loads

  1. Insulated systems shall be secured with clips fastened to
    1. thermally non-conductive, intermediate or continuous supports that pass through the insulation assembly, or
    2. mechanically fastened bearing plates which are installed on the top surface of the insulation.

3.3.4. Uninsulated Roof Systems

3.1.5.1. Securement Against Specified Wind Loads

  1. Uninsulated systems shall be secured with clips fastened to the roof deck, in keeping with the engineered design requirements (Ref. Article 3.1.3.3.) and conforming to the material requirements in Article 9.2.1.4. and Article 9.2.1.5.

3.3.5. Reserved

3.3.6. Roof Replacement and Alterations

3.3.6.1. Complete Roof System Replacement

  1. 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. Partial Roof Replacement

  1. When only a portion of an existing roof system is specified for replacement, the new materials must be secured to resist wind Specified Wind Loads, following the design specified by the Design Authority (See also Subsection 1.1.4., "Replacement and Alterations").

Part 4 - Materials

Section 4.1. Design

4.1.1. General

4.1.1.1. Scope

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

4.1.1.2. Definitions

  1. 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.

4.1.2. Reserved

4.1.3. Reserved

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.)

  1. 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.
  2. 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.
  3. All installed roofing materials that are susceptible to moisture damage must be made watertight by the end of each workday.
  4. 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

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

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

3.3.1.2. 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 or RoofStar 10-year Guarantee.

4.3.2. All Systems

4.3.2.1. Application of New Materials

  1. All new materials installed as part of the roof system shall conform to the manufacturer's published requirements, unless stated otherwise in 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

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

5.1.1.2. Definitions

  1. Words that appear in italics are defined in the Glossary.

5.1.2. Guarantee Term Requirements

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

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

5.1.2.2. 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 or RoofStar 10-year Guarantee.

5.1.3. All Systems

5.1.3.1. Required Use of Overlays

(See Note A-5.1.3.1.)

  1. A deck or wall overlay must be specified
    1. when a thermal layer is required by the Building Code, or
    2. when the conditions of the deck or wall are unsuitable for receiving roofing materials.
  2. Uninsulated systems designed for a steel deck require a deck overlay to support the underlayment.

Section 5.2. Materials

(See Division C, "Accepted Materials")

5.2.1. Material Properties

5.2.1.1. Suitability of Overlays

  1. 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.
  2. 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

  1. 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

  1. 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

  1. 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 and RoofStar 10-year Guarantee

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

5.3.1.2. 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 or RoofStar 10-year Guarantee.

5.3.2. All Systems

5.3.2.1. Support, Arrangement, and Securement of Deck Overlays

  1. 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).
  2. 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.
  3. When mechanical fasteners are used to secure deck overlays, the minimum number of fasteners (in combination with plates) shall be four (4), for every 1219.2 mm x 2438.4 mm (48" x 96") sheet.

5.3.2.2. Overlays on Steel Decks

  1. Steel deck panels must be overlaid with a suitable substrate to provide a smooth, uniform surface for roofing.
  2. 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.
  3. 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

  1. While metal panels must be separated from a concrete deck to prevent corrosion, a deck overlay is not mandatory, and separation may be made with an underlayment.

5.3.2.4. Overlays on Wood Decks

  1. 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

  1. 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.)

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

6.1.1.2. Definitions

  1. Words that appear in italics are defined in the Glossary.

6.1.2. Guarantee Term Requirements

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

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

6.1.2.2. 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 or RoofStar 10-year Guarantee.

6.1.3. All Systems

6.1.3.1. Responsibility for Design

  1. 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.).
  2. The Design Authority is urged to review and consider the performance characteristics of materials available for such applications.
  3. Coverage under the RoofStar Guarantee shall be as described in Division A, Article 3.2.1.2..
  4. 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 Between Building Enclosure Systems

  1. 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.

6.1.3.3. Use of Air Control Materials

  1. 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.

6.1.3.4. Use of Vapour Control Materials

  1. 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.
  2. 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

  1. 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

  1. 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.)

  1. 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

  1. 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.
  2. 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.
  3. 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).
  4. 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

  1. 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.
  2. 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. Vapour Controls for Concrete Decks

  1. Because curing concrete releases considerable moisture that can compromise the performance of a roof system, a vapour control layer installed on new concrete decks (28 days or older) must be selected to prevent condensation inside the roof system.
  2. A membrane with a permeability of 0.01 perms (Class I) is recommended for applications on concrete substrates, but the selection of vapour control materials is nevertheless the responsibility of the Design Authority.

Section 6.3. Application

6.3.1. Guarantee Term Requirements

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

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

6.3.1.2. 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 or RoofStar 10-year Guarantee.

6.3.2. All Systems

6.3.2.1. Continuity and Support

  1. 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.
  2. 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.
  3. 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.
  4. When self-adhered membranes are applied directly to a steel supporting deck,
    1. membranes should be oriented parallel to the direction of deck flutes, and
    2. membrane laps and changes in plane must be supported by deck flutes, or by flat metal supports secured to the deck to span gaps.
  5. When metal supports are used to span gaps between steel deck flutes, they must be
    1. fabricated from pre-finished steel with a thickness no less than 24-gauge, and
    2. secured to the deck with no fewer than two (2) compatible screw fasteners per flute (See Figure 6.3.2.-A and Figure 6.3.2.-B).

6.3.2.2. Torch-applied Materials

  1. The application of materials to an unprotected combustible material, using a torch, is strictly prohibited.
  2. 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.
  3. 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.
  4. 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

  1. 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.-A (Click to expand)
Figure 6.3.1-1.jpg
Figure 6.3.2.-B (Click to expand)
Figure 6.3.1-2.jpg

6.3.2.4. Reserved


Part 7 - Insulation

Section 7.1. Design

7.1.1. General

7.1.1.1. Scope

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

7.1.1.2. Definitions

  1. 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 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 wool 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 and RoofStar 10-year Guarantee

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

7.1.2.2. 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 or RoofStar 10-year Guarantee.

7.1.3. All Systems

7.1.3.1. Responsibility for Design

(See Note A-7.1.3.1.)

  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

(See Note A-7.1.3.2.)

  1. 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.
  2. Insulation may be used below the roof deck (not part of the roof assembly), provided a ventilation space no less than 63.5 mm (2-1/2"), measured between the underside of the roof deck and the top face of insulation, is retained beneath the deck to keep it cool (Ref. the "British Columbia Building Code", Division B, Article 9.19.1.1., "Required venting", and Article 9.19.1.3., "Clearances").
  3. Spray foam insulation may not be used directly beneath a wood roof deck that supports an architectural sheet metal panel roof system, unless the manufacturer, and the Guarantor, jointly agree in writing that moisture in the roof deck can be adequately vented out of the roof assembly.

7.1.3.3. Use of Existing Insulation

  1. Existing insulation on a roof may be reused (it will be excluded from coverage under the Guarantee), 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.)

  1. Insulation assemblies 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").
  2. 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.-A).
  3. 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.-B).
  4. Insulated systems that utilize metal panel clips shall specify clip attachment
    1. to thermally non-conductive, intermediate or continuous supports that pass through the insulation assembly, or
    2. to mechanically fastened bearing plates which are installed on the top surface of the insulation.
Figure 7.1.3.-A (Click to expand)
7.1 Insulation Layering.jpg

7.1.4. Insulated Systems

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

7.1.4.1. Reuse of Insulation for Panel Replacement

  1. When a roof is specified for panel replacement only, the existing insulation may be left in place (Subject to the requirements in Article 1.1.4.3.), but will be excluded from coverage under the Guarantee.

7.1.4.2. Protection of Heat-sensitive Insulation

  1. When heat-sensitive insulation is used in the primary thermal assembly, it must be covered with a heat-resistant insulation at least 50.8 mm (2”) thick (See Note A-7.1.4.2.).

Section 7.2. Materials

(See Division C, "Accepted Materials")

7.2.1. Material Properties

7.2.1.1. General

  1. 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

  1. The maximum width and length of insulation boards installed with mechanical fasteners is limited only by the manufacturer.
  2. 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.

7.2.2. Suitability of Insulation

7.2.2.1. Extruded Polystyrene Insulation

  1. Extruded polystyrene insulation ("XPS") is heat-sensitive and shall conform to CAN/CGSB-51.20-M87, "Thermal Insulation, Polystyrene, Boards and Pipe Covering", for Type 4 insulation, and to ASTM C578, "Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation".

7.2.2.2. Expanded Polystyrene Insulation

  1. Expanded polystyrene ("EPS") is heat-sensitive and shall conform to ASTM C578, "Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation".

7.2.2.3. Polyisocyanurate Insulation

(See Note A-7.2.2.3.)

  1. Polyisocyanurate insulation ("Polyiso") is heat-resistant and
    1. shall conform to CAN/ULC-S704, "Standard for Thermal Insulation, Polyurethane and Polyisocyanurate, Boards, Faced", and to ASTM C-1289, "Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board",
    2. shall be manufactured with non-organic facers, and
    3. shall be labeled to identify the manufacturer and the date of manufacture.

7.2.2.4. Mineral Fibre Insulation

  1. Mineral fibre insulation ("Mineral wool") is heat-resistant and shall conform to ASTM C726-17, "Standard Specification for Mineral Wool Roof Insulation Board".

Section 7.3. Application

7.3.1. Guarantee Term Requirements

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

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

7.3.1.2. RoofStar 15-Year Guarantees

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

7.3.2. All Systems

7.3.2.1. Procurement of Insulation

  1. All insulation, except insulation that may be specified for re-use (See Article 7.1.3.2.), must be supplied and installed by the Contractor.

7.3.2.2. Alignment, Sizing, and Support

  1. Insulation boards
    1. must be firmly supported,
    2. should be square and should make firm, full contact with adjacent panels,
    3. 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
    4. must be offset at least 304.8 mm (12"), 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.-A).
  2. 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.-A (Click to expand)
    7.3 Insulation Offset and Staggered.jpg

  3. 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.-B).
    Figure 7.3.2.-B (Click to expand)
    Figure 7.3.2.-B (ASM).jpg

7.3.2.3. Insulation Securement

  1. Insulation securement shall conform to the specified design for the roof assembly, calculated to resist the Specified Wind Loads for the roof system.
  2. When thermally non-conductive clips or bars are utilized on a low slope roof to retain insulation and support panel clips, they must be embedded in, and fastened through, a compatible sealant (See Article 9.2.1.7.).

7.3.2.4. Protection of Heat-sensitive Insulation

  1. Heat-sensitive insulation must be protected from high temperatures, both during construction and when placed in service, and therefore it must be overlaid with heat-resistant insulation no less than 50.8 mm (2") thick (See Article 7.1.4.2.).



Part 8 - Eave, Valley, and Field Underlayment

Section 8.1. Design

(See Note A-8.1)

8.1.1. General

8.1.1.1. Scope

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

8.1.1.2. Definitions

  1. Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
    1. Eave and Valley Protection means a self-adhering sheet membrane applied in valleys and in parallel courses on the roof deck along the eaves, up the roof slope to a point measured vertically from the inside of the exterior wall, and intended to block the ingress of water that may leak behind shingles or metal roof panels as the result of snow or ice buildup on the roof surface.
    2. Separation Layer (sometimes referred to as a "slip sheet") means a roll material installed directly below metal roof panels to
      1. inhibit bonding of the metal panels to underlying materials, such as bitumen-based underlayments or eave protection membranes, or
      2. permit the passage of vapour out of the roof system (A separation layer by itself does not function as a ventilation layer).
    3. Underlayment means a sheet (rolled) material that is either self-adhering or mechanically fastened (typically with large head nails), and which is installed
      1. immediately over the supporting deck or deck overlay,
      2. to provide secondary protection between the water-shedding system materials and the building interior, and
      3. to keep water-shedding system materials from adhering to the deck..
    4. Ventilation Layer means a layer of roll material, usually comprised of stiff, synthetic entangled mesh, installed directly beneath the metal panels in place of, or in addition to, a separation layer; it forms a ventilation space intended to
      1. facilitate the drying of condensation that collects on the bottom surface of metal roof panels, and
      2. inhibit bonding of metal roof panels with underlying materials.

8.1.2. Guarantee Term Requirements

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

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

8.1.2.2. 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 or RoofStar 10-year Guarantee.

8.1.3. All Systems

8.1.3.1. Eave Protection

  1. Sheet membrane eave protection is required on all Common Slope, Steep Slope, and Extreme Slope roofs, but is not required
    1. over unheated spaces, and
    2. where the roof overhang exceeds 914.4 mm (36") measured along the roof slope from the edge of the roof to the inner face of the exterior wall.
  2. Sheet membrane eave protection
    1. must conform to the material requirements in Article 8.2.1.2.,
    2. must be installed on the supporting deck or on a deck overlay,
    3. may also serve as an air barrier or vapour retarder, or as both, when installed in combination with an underlayment sharing the same performance characteristics,
    4. must be at least 1 mm thick when the roof slope exceeds 1:6 (2” in 12”),
    5. shall be at least 3 mm thick when the roof slope is less than 1:6 (2” in 12”). and
    6. must be carried
      1. a minimum of 609.6 mm (24") up inside interior walls (914.4 mm (36") in heavy snow load conditions, and
      2. down the vertical face of the eave and rake edges by at least 50.8 mm (2").

8.1.3.2. Valley Protection

  1. Valley Protection is required on all projects, shall conform to the requirements for eave protection in Article 8.1.3.1., and shall be specified to cover the entire valley, even where eave protection is exempt.

8.1.3.3. Field Underlayment

  1. Underlayments are required on all Architectural Sheet Metal Panel Systems, and
    1. must be self-adhering when the roof slope is equal to or greater than 1:6 (2" in 12") but is less than 1:3 (4" in 12"), and
    2. may be nail-applied or self-adhered when the roof slope is 1:3 (4" in 12") or greater.
  2. Self-adhered membranes specified for low slope roofs (slopes less than 1:3 (4" in 12")) must
    1. conform to the material requirements in Article 8.2.1.3. , and
    2. achieve a finished thickness of at least 1 mm (3 mm for roofs sloped less than 1:6 (2" in 12"))
  3. Multiple layers of self-adhering eave protection membrane may be specified to achieve the minimum thickness requirement in this Article, but
    1. each layer must be at least 1.4 mm thick, and
    2. layering must be permitted by the Guarantor through a written Variance (Ref. Article 1.1.3.6.)

8.1.3.4. Separation Between Materials

  1. A separation material is required
    1. when metal panels or flashings come in direct contact with any bituminous underlayments manufactured without a bond-breaking top face, or
    2. when soldering is to be done.
  2. A vapour-permeable separation layer is required between metal panels and insulation.

8.1.3.5. Ventilation Beneath Panels

  1. A ventilation space beneath metal roof panels
    1. is required on slopes less than 1:3 (4” in 12”),
    2. is required beneath curved panel systems, and
    3. is recommended when the roof slope exceeds 1:3 (4” in 12”).
  2. Ventilation beneath panels shall be incorporated into the roof system design
    1. by supporting the metal panels with entangled mesh that is at least 6.35 mm (1/4”) thick, and by securing the panels using standard panel clips supported on EPDM pads equal in thickness to the entangled mesh (Ref. Article 9.2.1.6.), or
    2. by elevating unsupported metal panels above the underlying substrate materials by at least 9.53 mm (3/8”), and securing the panels with tall panel clips; this approach does not require EPDM pads and entangled mesh, and is acceptable provided the Design Authority supplies the Guarantor with written engineering certification that
      1. the clips will adequately secure and support the elevated panels.
      2. the panels are suitable as spanning members and will support anticipated live loads, including loads during construction.

Section 8.2. Materials

(See Division C, "Accepted Materials")

8.2.1. Material Properties

8.2.1.1. Suitability of Materials

  1. Materials used for eave or valley protection, as an underlayment, or as a separation layer, must not damage the painted finish of roof panels (a scratched or marred finish may result in panel corrosion).
  2. When a material not listed in Division C is specified for application in an Architectural Sheet Metal Roof System, the Design Authority must request a written Variance from the Guarantor.
  3. All membranes must be supplied with proprietary sealants, mastics, tapes, and primers, each one suitable for the application of the underlayment.

8.2.1.2. Eave and Valley Protection

  1. Sheet membranes used for eave and valley protection must
    1. conform to the requirements in CSA-A123.22, "Self-adhering polymer modified bituminous sheet materials used as steep roofing underlayment for ice dam protection,"
    2. be made of bitumen with a high softening point and a minimum flow temperature of 87.7°C (190°F) when they are used immediately below any metal panels or flashing (Ref. ASTM D5147, "Standard Test Methods for Sampling and Testing Modified Bituminous Sheet Material"),
    3. be self-adhering, and
    4. have a sanded or synthetic, non-bonding top surface.

8.2.1.3. Underlayment

  1. Mechanically attached polymeric ("synthetic") fabric underlayments shall conform to the criteria in RGC ACWS-PUL, "RGC Acceptance Criteria for Mechanically Attached Polymeric Roof Underlayments Used in Water-shedding Systems".
  2. Modified bituminous sheet membrane underlayments must conform to the requirements in Article 8.2.1.2.

8.2.1.4. Separation Materials

  1. Entangled mesh (See Article 8.2.1.5.), which is commonly used for ventilation immediately beneath metal panels, may also serve as a separation (bond-breaking) material.

8.2.1.5. Ventilation Materials

  1. Entangled mesh used in a ventilation cavity must be
    1. at least 6.35 mm (1/4") thick, and
    2. capable of supporting the weight of the roof system, together with its anticipated live loads (See Article 9.1.3.1.).

8.2.1.6. Fasteners

  1. Mechanical fasteners used to secure nail-applied underlayments must conform to the underlayment manufacturer’s requirements.
  2. Staples are not permitted.

Section 8.3. Application

8.3.1. Guarantee Term Requirements

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

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

8.3.1.2. RoofStar 15-Year Guarantees

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

8.3.2. All Systems

8.3.2.1. Installation of Eave Protection

  1. Where eave protection is required, it must
    1. overhang the fascia by at least 25.4 mm (1”),
    2. extend up the slope at least 914.4 mm (36"), or to a line not less than 609.6 mm (24") inside the inner face of the exterior wall (914.4 mm (36") in regions with heavy snow; see Figure 8.3.1.), and
    3. extend up all abutments (walls, skylights, etc.) at least 152.4 mm (6″) above the surface of the finished roof system surface.
  2. Horizontal runs of eave protection must be positively lapped at least 50.8 mm (2″) and end laps (vertical joints) must be at least 152.4 mm (6″).
Figure 8.3.2.-A (Click on image to expand)
Figure 8.3.2.-A.jpg

8.3.2.2. Valley Protection

  1. Valley protection membranes must
    1. be the same materials used for eave protection, conforming to the requirements in Article 8.2.1.2.,,
    2. be centred on, and installed parallel to, the valley line, extending from the eave edge past the upper end of the valley metal flashing, at least 50.8 mm (2”),
    3. be at least 990.6 mm (39”) wide and centred on the valley,
    4. positively overlap lower runs of valley membrane by no less than 152.4 mm (6”), rolled to ensure even, full adhesion, and
    5. positively lap and seal to the eave protection membrane.

8.3.2.3. Underlayment for Common and Steep Slopes

  1. All nail-applied polymeric ("synthetic") underlayments installed on slopes less than 2:3 (8” in 12”)
    1. shall be installed using fasteners acceptable to the manufacturer of the underlayment,
    2. shall be secured to conform to the underlayment manufacturer's published instructions,
    3. must run parallel to the eave,
    4. shall positively overlap adjacent material by
      1. at least 76.2 mm (3″) along the sides, unless exceeded by the manufacturer’s instructions, and
      2. at least 152.4 mm (6″) at the ends, unless exceeded by the manufacturer’s instructions,
    5. must run beneath all water-shedding system materials, irrespective of slope,
    6. must extend beneath all perimeter linear metal flashing,
    7. shall cover the roof deck beneath all penetration flashings, and
    8. must be carried up vertical surfaces at least 152.4 mm (6”) above the roof deck, where roofing materials and flashings adjoin walls or curbs.
  2. "Negative" laps that are unavoidable in horizontally applied courses of underlayment are permissible, but only when
    1. the underlayment is a self-adhering membrane (Ref. Article 8.2.1.3.),
    2. the membrane runs overlap at least 152.4 mm (6"), and
    3. lapped seams are roller-pressed and sealed with a compatible sealant along the seam edge.
  3. Installing nail-applied polymeric ("synthetic") or self-adhered bituminous or butyl underlayments perpendicular to the eave is permissible, but the laps must be self-sealing, or shall be sealed with a suitable lap cement provided by the underlay manufacturer.
  4. When an underlayment is installed perpendicular to the eave and the roof slope exceeds 2:3 (8” in 12”), the underlayment
    1. shall be self-adhering,
    2. must extend beyond the furthermost edge of the flashing at least 101.6 mm (4"), and
    3. shall positively laps beneath other vertical membranes.

8.3.2.4. Underlayment for Slopes Less Than 1:3

  1. All roofs sloped less than 1:3 (4" in 12") must be covered with one or more layers of self-adhered or thermally fused underlayment membrane,
    1. conforming to the material requirements in Article 8.2.1.3.,
    2. achieving a finished thickness of at least 1 mm (3 mm for roofs sloped less than 1:6 (2" in 12")), and
    3. installed to conform to to the requirements in Article 8.3.2.4.
  2. Applying multiple layers of self-adhering eave protection membrane to achieve the minimum thickness requirement is permissible, provided
    1. layering is acceptable to the underlayment manufacturer,
    2. the second layer is offset from the first by at least 304.8 mm (12"), both horizontally and vertically, and
    3. the Design Authority has obtained a written Variance from the Guarantor permitting multiple layers.

8.3.2.5. Separation Materials

  1. Horizontal runs of separation materials must be positively lapped at least 50.8 mm (2"), and vertical end joints must be lapped at least 152.4 mm (6").

8.3.2.6. Ventilation Materials

  1. Roof systems that require a ventilation space shall conform to the design specifications and required in Article 8.1.3.5.



Part 9 - Roof Field (Panel Systems)

Section 9.1. Design

9.1.1. General

9.1.1.1. Scope

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

9.1.1.2. Definitions

  1. 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 and RoofStar 10-year Guarantee

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

9.1.2.2. 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 or RoofStar 10-year Guarantee, and shall
    1. be designed using only RoofStar-accepted panels (or panels manufactured with a RoofStar-accepted roll forming machine) secured with a hidden clip system; flange-fastened panels may not be specified or installed.

9.1.3. All Systems

9.1.3.1. General Requirements

(See Note A-9.1.3.1.)

  1. Shop drawings for each project detail, which may be drawn by the Contractor, must be reviewed by the Accepted observer and returned to the Guarantor, verifying conformity to the RoofStar Guarantee Standards prior to the start of construction.
  2. Each construction detail must be reviewed during a field review and documented in the observer's RGC field review report, to verify conformity to the RoofStar Guarantee Standards.
  3. A system designed with a slope less than 1:6 (2" in 12") must conform to the limitations and conditions in Subsection 2.1.3.
  4. The Design Authority must calculate the maximum panel length based on
    1. the material type,
    2. the direction of expansion and contraction that is determined by the location of drag load fasteners, and
    3. the amount of expansion and contraction provided by
      1. the fastener slot on the fastening flange, or
      2. the concealed expansion clip slot.
  5. Panels must be able to withstand loads as required in Article 3.1.3.4.

9.1.3.2. System Securement

  1. Panel shape and securement must be designed to resist Specified Wind Loads (Ref. Article 3.1.3.2. and Article 3.1.3.3.).
  2. Metal panels must be pinned to the structure with fasteners, to prevent slippage down the roof because of the weight of the roof system ("drag loads").

9.1.3.3. Panel Seams

  1. Panel seam heights, which must accommodate the increased potential for water ingress as roof slope diminishes, shall conform to Table 9.1.
Table 9.1., Minimum Requirements for Seam Types and Heights
Slope
(see also 2.1 Roof Slope)
Seam Height Minimums Permissible Seam Types
1:3 (4" in 12") or greater 25.4 mm (1") All
1:6 (2" in 12") to (less than) 1:3 (4" in 12") 38.1 mm ( 1-1/2”) Mechanical Lock only (single or double)
41.28 mm ( 1-5/8”) Snap Lock (male seam)
Less than 1:6 (2” in 12”)
(reviewed by RGC prior to tender)
50.8 mm (2”) + butyl sealant in seam Mechanical Lock only (single or double)
50.8 mm (2”) Mechanical Lock only (double)
Power-curved panels
(reviewed by RGC prior to tender)
38.1 mm (1-1/2”) + butyl sealant in seam Mechanical Lock only (single or double)

9.1.3.4. Curved Panel Systems

(See Article 9.3.2.8.)

  1. Curved panel systems
    1. are permissible, but because a curved system diminishes in slope to a zenith of 0°, the design must be submitted to the Guarantor prior to tender (See Article 2.1.3.1.),
    2. may be specified with a minimum seam height of 38.1 mm (1-1/2") (subject to the requirements in Table 9.1.),
    3. must continuously cover a curved substrate; segmented panels are not permissible, and
    4. must incorporate a ventilation space (see Article 8.1.3.5.).
  2. Stiffeners are optional for curved panels, and when they are desired, the Design Authority should consult with the Contractor about stiffener profiles that can be power-curved.

9.1.4. Insulated Systems

9.1.4.1. General Requirements

  1. Insulated Architectural Sheet Metal Roof Systems
    1. must be designed to resist Specified Wind Loads (Ref. Article 3.1.3.2. and Article 3.1.3.3.),
    2. shall conform to all other requirements in this Standard, and
    3. shall minimize or eliminate thermal bridging, using thermally non-conductive clips or bars, or by using mechanically fastened bearing plates (see Part 7, "Insulation").>

9.1.5. Uninsulated Systems

9.1.5.1. General Requirements

  1. Uninsulated Architectural Sheet Metal Roof Systems
    1. must be designed to resist Specified Wind Loads (Ref. Article 3.1.3.2. and Article 3.1.3.3.), and
    2. shall conform to all other requirements in this Standard.

Section 9.2. Materials

(See Division C, "Accepted Materials")

9.2.1. Material Properties

9.2.1.1. Panel Grade, Gauge, and Selection

  1. 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 0.6858 mm (0.027", 24-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 1828.8 mm (60").
    2. Aluminum-Zinc alloy-coated steel: 0.6858 mm (0.027", 24-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 1828.8 mm (60").
  2. The following minimum gauges and/or weights of non-ferrous materials apply to all linear metal flashings:
    1. 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.
    2. 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").
  3. All panels must be factory-manufactured, or site-fabricated by an accepted Contractor, and listed in Division C.
  4. Sheet steel, copper and zinc roof panels may be roll-formed to a maximum width of 500 mm (20”).
  5. All metal roof panels over 304.8 mm (12”) in width must be roll-formed or factory-fabricated with stiffening ribs or striations.
  6. Panels fabricated with perforated fastening holes or slots must not exceed 9144 mm (30’) in length.
  7. When the roof system design specifies a ventilation space beneath the panels that are not supported by a ventilation layer, and tall clips are used to support the raised panels, the panels must be engineered to support anticipated live loads without permanent deformation (Ref. Article 9.1.3.1.).

9.2.1.2. Roll Forming Machines and Mill Certificate

  1. All machines used by a Contractor to fabricate metal panels shall be owned by a Contractor, and shall be accepted by the Guarantor.
  2. Site-forming metal panel machines
    1. must be certified annually by a third-party engineer,
    2. must be serviceable, maintained and calibrated with supporting documentation, and
    3. records documenting the serviceable condition of the machine must be submitted annually to the Guarantor.
  3. Contractors who own metal panel machines are responsible to meet or exceed the panel machine maintenance standards as established by the roll form machine manufacturer.
  4. the Contractor must provide a mill certification for all metal roofing projects installed under the RoofStar Guarantee Program.
  5. Mill certificates must confirm that the sheet metal used for forming metal panels and linear metal flashings conform to or exceeds the requirements in Article 9.2.1.1.

9.2.1.3.Pre-painted Finishes

  1. When a painted finish on G90 galvanized or AL-Zn alloy coated steel panels is specified, SMP pre-painted finishes are permissible but PVDF (polyvinylidene fluoride, also referred to as PVF2) is strongly recommended for durability and resilience.

9.2.1.4.Fasteners

(See also Article 3.2.2.1.)

  1. Fasteners used to secure metal panels or clips must be
    1. specified by the Design Authority,
    2. compatible with the material they contact,
    3. appropriately sized, in both length and thread type, for the material to which they will be secured, and
    4. corrosion-resistant screws with a low-profile head.

9.2.1.5.Clips

(See Note A-9.2.1.5.)

  1. Clips must be
    1. proprietary (not shop fabricated) and must be acceptable to the roll form machine manufacturer, for use with Architectural Sheet Metal Roof Systems, and
    2. compatible with the metal panel and other materials they contact.
  2. Attachment clips for Architectural Sheet Metal Roof Systems shall be manufactured with evenly spaced indents or guide holes for fastener placement, and must be formed from
    1. Steel (Z275 or G90)(AZ50 or AZM150).
    2. Aluminum.
    3. Stainless Steel.

9.2.1.6. Bearing Plates and EPDM Pads

  1. Bearing plates shall be
    1. manufactured from corrosion-resistant steel,
    2. of sufficient gauge to resist distortion under load, conforming to the engineered shop drawings,
    3. formed with recesses for fasteners, and
    4. press-formed to bevel the edges, for load distribution over the substrate.
  2. EPDM pads used to support panel clips
    1. must be sufficiently dense and thick (after compression)
      1. to equal the thickness of the ventilation layer (Ref. Article 9.3.2.5.), and
      2. to resist curling when placed under load.
    2. shall extend no less than 6.35 mm (1/4”), and no more than 19.05 mm (3/4”), past the edges of the bearing plate it will support.

9.2.1.7. Sealants

  1. 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.
  2. Sealants shall conform to any one of the following standards:
    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"
    4. CAN/CGSB-19.24, "Multi-Component, Chemical Curing Sealing Compound"

9.2.2. Materials Storage and Handling

9.2.2.1. Protection from the Weather

  1. 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").
  2. The Contractor must retain factory packaging or provide other adequate covering for metal panels, to protect them from condensation between adjacent surfaces, until the panels are installed.

9.2.3. Accessories

9.2.3.1. Accessories Supplied by Roof Panel Manufacturer

  1. 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 and RoofStar 10-year Guarantee

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

9.3.1.2. 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 or RoofStar 10-year Guarantee, and shall
    1. be constructed only with RoofStar-accepted panels secured by hidden clips; flange-fastened panels are not permitted.

9.3.2. All Systems

9.3.2.1. Preparation of Substrate

  1. 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
  2. All concrete decks 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),
  3. Plywood decks with cracks or loose knots must be filled or overlaid with plywood (See Article 5.2.1.1.).
  4. Joints between plywood deck panels must be prepared and reinforced according to the manufacturer’s published requirements.
  5. If surface drying is required prior to roofing, the deck must be dried with blown air.

9.3.2.2. Preparation of Roofing Materials

  1. Roofing materials must be prepared for installation as required by the manufacturer.

9.3.2.3. General Requirements for Panel Installation

  1. Panels must be handled with non-marring slings and hoisted using a spreader bar.
  2. Sheet steel, copper, and zinc roof panels must be installed with a continuous minimum tolerance gap of 1/8” between the heels of the panels.

9.3.2.4. Panel Securement and Seams

  1. Panels must be secured to resist
    1. Specified Wind Loads calculated for the roof system and shall conform to the specified design for the roof assembly, and
    2. gravitational (drag) loads.
  2. All panels must be secured to a firm support, and when clips are used to secure metal panels, the clips must be firmly supported by the roof deck, bearing plates, EPDM pads, or an alternative acceptable to the Guarantor (See Article 3.3.2.1.).
  3. Unless otherwise permitted by the Guarantor, clips must be attached by at least two fasteners (Ref. Article 3.3.2.1.).
  4. Concealed fasteners shall conform to the requirements in Article 9.2.1.4., and should provide clearance for the underside of the metal panel.
  5. Seam height shall conform to the requirements in Table 9.1. of this Part.

9.3.2.5. Panels Over Ventilation Materials or Voids

  1. When the roof is designed and constructed with a void or ventilation materials immediately beneath the metal panels, panels must be secured using
    1. standard-height clips (matching the height of panel seams), which must be fully supported on closed-cell EPDM foam pads, or
    2. tall clips, which must be
      1. fabricated to match the combined height of the EPDM foam pad and the panel seam,
      2. secured with fasteners into their supports, and
      3. fully embedded in a compatible sealant (See Article 9.2.1.7., "Sealants").
  2. EPDM foam pads employed to support standard-height panel clips are not a RoofStar-accepted material but nevertheless must be
    1. fabricated with sufficient density and thickness (after compression) to equal the thickness of the ventilation layer, and
    2. at least 19.05 mm (3/4”) larger, in width and length, than the bearing plate it will support.
  3. When the roof system design specifies a ventilation space beneath panels that are not supported by a ventilation layer, panels shall be supported by tall clips secured in keeping with the requirements in this Part.

9.3.2.6. Panel Terminations

  1. Metal panels must be secured at, and engaged to, the eaves by a continuous metal hook strip (see ASM 10.1.1 Eave & Rake Flashing (Mechanical Seam)).
  2. All panel terminations at the top of a slope must be
    1. turned up (bread-panned) to match the panel seam height, and shall not be cut, and
    2. flashed with a positively shedding cap, hip or wall flashing (see Subsection 10.3.4., "Perimeter Details, Walls, and Openings").
  3. When panels terminate at the top of a common slope or low slope roof (slopes up to and less than 1:1 (12” in 12”)), they must be closed with additional metal Z-closure
    1. set in two (2) rows of gunnable sealant or sealant tape, and
    2. fastened to the metal roof panel, or fastened through the panel into the deck when the fasteners also serve as drag load securement.

9.3.2.7. Reserved

9.3.2.8. Curved Panels

(See Article 9.1.3.4.)

  1. All panels manufactured for a curved substrate
    1. must be supported by a Variance issued by the Guarantor prior to tender (see Article 2.1.3.1.),
    2. must be power-curved as a continuous panel, without segments,
    3. shall be manufactured with seams conforming to Article 9.1.3.3., and
    4. must continuously cover a curved substrate (segmented panels are not permissible).
  2. Roofs constructed with curved panels must incorporate a ventilation space in keeping with Article 8.1.3.5.

Part 10 - Perimeters and Walls

Section 10.1. Design

10.1.1. General

10.1.1.1. Scope

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

10.1.1.2. Definitions

  1. Words that appear in italics are defined in the Glossary.

10.1.2. Guarantee Term Requirements

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

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

10.1.2.2. 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 or RoofStar 10-year Guarantee.

10.1.3. All Systems

10.1.3.1. General Requirements

  1. 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 layers is critical or required by Code (See Part 6, "Air and Vapour Controls").
  2. Projects must follow proper sequencing; materials must positively integrate (“shingle fashion”) with other materials, systems, or assemblies, including those installed by other trades.
  3. Wall surfaces must be suitable to receive roof materials, or they must be covered with an accepted overlay panel material listed in Division C.
  4. 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 (See Note A-10.1.3.1. ).
  5. 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-10.1.2.2).
  6. Fascia may be covered with metal flashing and specified as part of the roof system.

10.1.3.2. Flashing

  1. 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 self-adhering sheet membrane eave protection, and with metal flashing.
  2. Linear metal flashing is required at all roof edges, ridges, hip perimeters, and at the tops of parapets, to protect sheet membrane flashing from damage.

10.1.4. Perimeter Details, Walls, and Openings

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

10.1.4.1. Ridges

  1. All cap and hip flashings designed for common slope and low slope roofs (slopes up to and including 1:1 (12” in 12”)) must be secured with hooked metal Z-closures which are
    1. set in two (2) rows of gunnable sealant or sealant tape, and
    2. fastened through the metal roof panel into the deck.
  2. Cap and hip flashings designed for steep slopes (roofs with a slope greater than 1:1 (12” in 12”)) may be
    1. secured with metal Z-closures installed in keeping with the requirements in Article 10.3.4.1., or
    2. secured to the standing seams with acceptable fasteners (flashing may be turned down between panel ribs to close off openings, to provide further protection from the weather).

10.1.4.2. Eave and Rake Edges

  1. Eave and rake edge details shall
    1. be designed to resist wind uplift loads, and shall conform to the requirements in Article 10.3.4.2., and
    2. permit the drainage of any liquid water out of the roof system (Ref. Article 11.1.3.1., "Principles of Design").

10.1.4.3. Walls

  1. Roof-to-wall flashings must
    1. be engineer-designed to resist wind uplift, and
    2. allow for expansion and contraction.
  2. All connecting flashings must be firmly secured
    1. to a wall using a concealed continuous clip fastened at intervals not exceeding 304.8 mm (12”) O.C. (exposed fasteners are not permitted), or
    2. to the metal panels using
      1. a metal Z-closure set in two (2) rows of gunnable sealant or sealant tape, and fastened through the metal roof panel into the deck, or
      2. exposed fasteners installed through the flashing into panel ribs.

10.1.4.4. Reserved

10.1.4.5. Windows and Wall Openings

  1. Windows and other wall openings adjacent an Architectural Sheet Metal Roof System shall conform to the relevant requirements in the "Standard for SBS-modified Bitumen Membrane Roof Systems", Article 10.1.4.5..

10.1.5. Valleys

10.1.5.1. Valley Protection Membrane

  1. Valley protection membrane shall conform to the requirements in Article 8.1.3.1. and Article 8.1.3.2.

10.1.5.2. Valley Flashing

  1. All valleys must be designed with both membrane flashing and metal valley flashing.
  2. Metal flashing must
    1. incorporate a divider measuring at least 25.4 mm (1") high, folded to a maximum of 60 degrees on the inside angle of the divider, and
    2. be secured to resist gravitational ("drag") loads.
  3. Metal valley flashing shall be at least 127 mm (5") wide, measured between the divider and the edge of the metal roof panel, and may be either hooked or unhooked (See Article 10.3.4.2.).

10.1.5.3. Valleys for Heavy Snow Loads

  1. In regions with high snow loads, the minimum valley width should be increased and flared to widen at the eave (See Article 1.1.3.2., "Snow Loads", and Article 10.1.5.1.).

10.1.5.4. Reserved

10.1.5.5. Dead Valleys

  1. Dead valleys should be avoided, but when a roof slope terminates in a dead valley, it must be designed as a waterproofing roof system the design must conform to the Application requirements in Article in 10.3.5.7.

10.1.6. Reserved

10.1.7. Intersections with Other Roof Systems

10.1.7.1. Intersections with Waterproofing Roof Systems

  1. 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

  1. Refer to Article 11.1.4.3.

Section 10.2. Materials

(See Division C, "Accepted Materials")

10.2.1. Material Properties

10.2.1.1. Flashing Membrane

  1. See Article 8.2.1.2. for sheet membrane requirements.
  2. Regardless of the type or thickness of underlayment used in the field, all membrane flashing for changes in plane shall achieve a minimum finished thickness of 3 mm.

10.2.1.2. Linear Metal Flashing

  1. 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

  1. 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

  1. Mechanical fasteners used to secure linear metal flashing shall conform to the requirements in Article 13.2.1.3.

Section 10.3. Application

10.3.1. Guarantee Term Requirements

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

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

10.3.1.2. 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 or RoofStar 10-year Guarantee.

10.3.2. All Systems

10.3.2.1. Substrate Preparation

  1. All wall surfaces to which roofing materials must be installed (including Concrete Masonry Unit (CMU)) must be declared suitable by the manufacturer, or they must be 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.

10.3.2.2. Material Preparation

  1. Membrane flashing shall be prepared following the manufacturer's published requirements.

10.3.2.3. General Application Requirements for Perimeters and Walls

  1. All changes in plane in the roof assembly must be waterproofed beneath metal flashing with a self-adhering eave protection sheet membrane acceptable to the Guarantor.
  2. 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”).
  3. 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.
  4. All sheet membrane flashing must be installed to conform to the manufacturer's published instructions, and must
    1. be fully bonded to an acceptable substrate,
    2. be installed without fish-mouths or wrinkles,
    3. be hand-rolled with a manufacturer’s accepted roller and fully bonded to an acceptable, prepared substrate,
    4. be reinforced at all inside and outside corners with membrane gussets, measuring at least 101.6 mm x 152.4 mm (4” x 6”), excluding the tapered ends,
    5. overlap any wall membranes or finishes by at least 50.8 mm (2”), and
    6. underlap any wall membranes or finishes by at least 76.2 mm (3").
  5. The upper termination of sheet membrane flashing must be protected from damage, and from water intrusion,
    1. with linear metal flashing installed in keeping with Article 13.3.3.1., or
    2. with a wall finish installed by others.
  6. When sheet membrane flashing is terminated on a vertical surface, it must be secured at its upper termination.
  7. When sheet membrane flashing is mechanically secured with a termination bar or a metal flashing, fasteners must be spaced no more than 304.8 mm (12”) O.C.
  8. When a second metal flashing is installed to protect a termination bar or flashing used to secure the sheet membrane flashing, it may be fastened no more than 609.6 mm (24”) O.C., provided the linear metal flashing maintains continuous contact with the substrate.
  9. When closer fastener spacing is required by the manufacturer, the wall must be constructed or modified to facilitate solid fastener securement.
  10. Linear metal flashings must be secured in keeping with the requirements in Article 13.3.3.1.

10.3.2.4. Protection of Membranes

  1. Membrane flashing must be protected from damage with full-coverage linear metal flashing.

10.3.3. Reserved

10.3.4. Perimeter Details, Walls, and Openings

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

10.3.4.1. Ridges

  1. All cap and hip flashings installed on slopes 1:6 (2" in 12") (Common Slope) and slopes up to and less than 1:1 (12” in 12”) (Low Slope) must be hooked to metal Z-closures which are
    1. set in two (2) rows of gunnable sealant or sealant tape.
    2. fastened through the metal roof panel into the deck.
  2. Cap and hip flashings installed on roofs with a slope greater than 1:1 (12” in 12”) (Steep Slopes) may be
    1. hooked to a metal Z-closure, and
    2. mechanically fastened to the standing seam with an acceptable fastener.
  3. For roof slopes
    1. up to 2:3 (8” in 12”), metal cap/hip flashing must extend a minimum of 152.4 mm (6") over metal roof panels, measured from the back pan, and extending on each side of the ridge/hip.
    2. equal to or greater than 2:3 (8” in 12”), the metal cap/hip flashing may be reduced by 76.2 mm (3”) over metal roof panels, measured from the back pan and extending on each side of the ridge/hip.
    3. greater than 1:1 (12” in 12”), an underlying support at the centre of the ridge is required to support the ridge cap flashing.

10.3.4.2. Eaves and Rake Edges

(See Construction Detail "Eave and Rake Edges (Mechanical Seams)")

  1. All linear metal flashing installed at the eave or rake edges must
    1. be completely separated from a wood deck with eave protection sheet membrane (Ref. Article 8.2.1.2.), and
    2. allow for metal panel expansion and contraction.
  2. Eave protection sheet membrane installed to separate eave and rake edge metal flashing from a wood deck shall extend past the edges of a flashing by at least 6.35 mm (1/4").
  3. Eave metal flashing
    1. must be fabricated to secure the eave edge of the panel in place,
    2. shall extend onto the sloped deck or supporting member at least 76.2 mm (3”),
    3. shall be secured
      1. along the top flange with screws spaced in accordance with the engineered design but no further apart than 304.8 mm (12”) O.C.,
      2. on the fascia metal flashing, utilizing a continuous clip fastened a maximum of 304.8 mm (12") O.C., and
      3. shall be covered with eave protection sheet membrane.
    4. When external metal gutters are installed (See Article 11.3.3.9.), linear metal eave flashing with a face less than 50.8 mm (2”) do not require a clip but must be securely fastened with an alternative method acceptable to Design Authority.
  4. Rake edge metal flashing must be firmly secured
    1. to a wall using a concealed continuous clip fastened a maximum of 304.8 mm (12”) O.C. (Ref. Part 13 for clip requirements; exposed fasteners are not permitted), or
    2. to the metal panels using
      1. a metal Z-closure set in two (2) rows of gunnable sealant or sealant tape and fastened through the metal roof panel into the deck, or
      2. exposed fasteners installed through the flashing into panel ribs.
  5. Where external metal gutters will be installed, the eave metal flashing should be installed to accommodate the gutter and hangar.
  6. When gutter hangars are to be fastened behind the eave flashing, the eave flashing does not require a continuous clip and may be face-screwed together with the gutter hangar.

10.3.4.3. Reserved

10.3.4.4. Reserved

10.3.4.5. Windows and Wall Openings

  1. Windows and other wall openings that intersect with the roof system shall be flashed with membrane and metal conforming to the requirements in the "Standard for SBS-modified Bitumen Membrane Roof Systems", Article 10.3.4.5.

10.3.5. Valleys

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

10.3.5.1. Valley Protection

  1. Valley protection membrane must be installed in keeping with the requirements in Article 8.3.2.2.

10.3.5.2. General Requirements for Valley Metal Flashing

  1. Drag load fastening is mandatory on all valleys.
  2. Metal valley panels must
    1. be installed shingle fashion,
    2. overlap the adjacent lower panel at least 203.2 mm (8"), and
    3. be sealed at the lapped joint with two horizontal rows of approved sealant.
  3. Valley dividers are required and must be at least 25.4 mm (1") high, folded to a maximum of 60 degrees on the inside angle of the divider.
  4. Exposed valleys must be at least 254 mm (10") wide (no less than 127 mm (5") per side, measured from the divider to the metal roof panel); wider valleys are recommended in high snow load areas (See Article 1.1.3.2., "Snow Loads").
  5. Metal valley sections (hooked or unhooked)
    1. must overlap the section immediately down-slope at least 203.2 mm (8"),
    2. shall be embedded in at least two rows of an acceptable sealant or butyl tape where they overlap,
    3. shall be secured in keeping with the specified design, and
    4. shall be flashed ("stripped in") and sealed to the valley protection membrane with eave protection sheet membrane conforming to Article 8.2.1.2.,
      1. measuring at least a 304.8 mm (12”) in width, and
      2. applied to extend past the flashing fasteners by at least 38.1 mm (1-1/2”).
  6. Reverse laps must be sealed with a membrane-compatible sealant.

10.3.5.3. Hooked Metal Valleys

(see also ASM 10.3.1 Hooked Valley Flashing)

  1. Hooked metal valley sections shall, in addition to the general requirements in Article 10.3.5.3.,
    1. be fabricated with a built-in hook strip returned 38.1 mm (1-1/2") to
      1. form a water cut-off, and
      2. hook onto the valley metal panel, and
    2. incorporate a flange measuring at least 76.2 mm (3”) wide, to secure the metal valley flashing to its substrate.

10.3.5.4. Unhooked Metal Valleys

(see also ASM 10.3.2 Unhooked Valley Flashing)

  1. Unhooked metal valley sections shall, in addition to the general requirements in Article 10.3.5.4.,
    1. be hemmed with a return measuring at least 38.1 mm (1-1/2") to form a water cut-off, and
    2. secured with continuous cleats
      1. be fabricated from 26-gauge flat metal stock (min. thickness), and
      2. be fabricated with a leg measuring at least 76.2 mm (3”) wide.

10.3.5.5. Reserved

10.3.5.6. Reserved

10.3.5.7. Dead Valleys

  1. Dead valleys must be
    1. waterproofed to conform to the requirements for membrane gutters (See Article 11.3.3.8.), and
    2. sloped at least 1:50 (2%, or 1/4” in 12”), to positively drain
      1. into one or more roof drains, or
      2. onto a lower water-shedding roof.
  2. Transitions from a dead valley to the metal panel system must conform to the requirements in Article 10.3.7.2., and where a wall is present, a diverter shall be incorporated to protect the wall system..

10.3.6. Reserved

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

  1. 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 Waterproofing Roof Systems

  1. When a waterproofing roof system transitions down a slope onto a lower water-shedding roof system, the waterproofing roof system membrane must lap over the water-shedding roof system by no less than 50.8 mm (2").
  2. When a waterproofing roof system transitions up a slope and underlaps a water-shedding system,
    1. sheet membrane flashing must extend up the water-shedding roof system slope at least
      1. 152.4 mm (6”), plus 76.2 mm (3”) for the overlap by the water-shedding roof system, when measured vertically from the maximum water level,
      2. 203.2 mm (8”), plus 76.2 mm (3”) for the overlap by the water-shedding roof system, when measured vertically from the drainage plane, and
      3. 304.8 mm (12”) plus 76.2 mm (3”) for the overlap by the water-shedding roof system, when measured vertically from the drainage plane or 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,
    3. underlayment must overlap the waterproofing roof system sheet membrane flashing by no less than 101.6 mm (4”),
    4. metal panels must overlap the waterproofing roof system sheet membrane flashing by at least 152.4 mm (6”) (A metal counter-flashing with an exposure of at least 101.6 mm (4”) is required at the bottom termination of the metal panels), and
    5. fasteners for the water-shedding roof system must be at least 203.2 mm (8”) above the finished roof system surface of the waterproofing roof system (when measured vertically), or 304.8 mm (12”) for regions with heavy snow.

10.3.7.3. Intersections with Membrane Gutters

  1. Refer to the requirements in Article 11.3.3.8.

10.3.8. Reserved


Part 11 - Drainage

Section 11.1. Design

11.1.1. General

11.1.1.1. Scope

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

11.1.1.2. Definitions

  1. 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 and RoofStar 10-year Guarantee

  1. All projects intended to qualify for a RoofStar 5-year or RoofStar 10-year Guarantee shall comply with the requirements in this Part.

11.1.2.2. RoofStar 15-Year Guarantee

  1. All projects intended to qualify for a RoofStar 15-year Guarantee shall comply with the requirements in this Part for a RoofStar 5-year or RoofStar 10-year Guarantee.

11.1.3. All Systems

11.1.3.1. Principles of Design

  1. The roof assembly must be designed to drain or shed all water, including any liquid water that may find its way inside the roof system, at or on the underlayment (Ref. Article 10.1.4.2.).
  2. The Design Authority is responsible for the design of roof drainage.
  3. 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.
  4. 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.
  5. 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).
  6. Roofs may drain off a roof edge, or by means of internal plumbing (both are permissible under the RoofStar Guarantee Program).
  7. When a roof is designed to drain off an edge, water may drain freely, it may be diverted to a lower roof area, or it may be collected and diverted into a drainage system (plumbing) by means of an external or built-in gutter (See Article 11.1.4.3.).
  8. The membrane of the lower roof onto which drain water is directed must be protected from abrasion with splash pads.
  9. 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.
  10. If a flow restrictor is present in an existing cast drain leader, the restrictor should be reinstalled.

11.1.3.2. Roof Drain Function and Location

  1. Roof drains must be used only for draining water.
  2. Roof drains on new construction projects must be located at least 304.8 mm (12”) 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).
  3. When existing roof drain and penetration locations do not comply with the spacing requirements in this Part, the Design Authority must submit a written request for a Variance, following the requirements in Article 1.1.3.6., "Variances".

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

  1. Only cast-iron roof drains, and existing external couplers used to connect drains to leaders, may be re-used for roof replacement projects.
  2. 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.)

  1. A scupper drain may serve either as a primary roof drain or as a secondary drain.
  2. 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.
  3. Overflow drains are required for membrane gutters, and when they are specified, they must be
    1. located no higher than 101.6 mm (4”) above the drainage plane,
    2. situated so that they freely and visibly discharge storm water, and
    3. specified with an opening sufficient in size to equal or exceed the rate of rainfall.

11.1.4.3. Membrane Gutters

(See Note A-11.1.4.3.)

  1. 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.
  2. 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.
  3. New membrane gutters shall be designed with a minimum width of 304.8 mm (12”) and a depth not exceeding the gutter’s width.
  4. 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.
  5. Only fully-adhered membranes may be used in membrane gutters.
  6. 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.
  7. Conventionally insulated systems that drain into a membrane gutter must abut solid blocking at the gutter edge, which provides
    1. a stop for the insulation assembly, and
    2. a solid substrate for the securement of flashings and membranes.
  8. 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.
  9. 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 standards in this Part.
  10. 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.
  11. 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. External Gutters

  1. External gutters and downspouts are not covered by the RoofStar Guarantee.
  2. Notwithstanding other requirements in this Part, when a roof drains onto another roof, the drainage of water must be controlled to eliminate or mitigate damage from water flow; the use of splash pads, when appropriate for the location, is strongly recommended.
  3. Downspouts, installed by the Contractor or other trades and laid directly against the slope of the roof to connect an upper roof drainage to lower gutters, is acceptable under the RoofStar Guarantee Program, provided the material is strongly secured both at the top and the bottom, and the issue of dissimilar metal corrosion can be eliminated.

Section 11.2. Materials

(See Division C, "Accepted Materials")

11.2.1. Material Properties

11.2.1.1. General Requirements

  1. 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.
  2. 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.).

11.2.1.2. Roof Drains and Scuppers

(See Note A-11.2.1.2.)

  1. 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).
  2. 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.
  3. 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).
  4. Lead sheet flashing, when specified, 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).
  5. 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. should incorporate a clamping ring (a clamping ring is recommended for primary flanged insert drains specified on any project, but clamping rings are required when primary flanged insert drains are specified for a RoofStar 15-year Guarantee).
  6. 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”)).
  7. 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”)).
  8. 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”)).
  9. 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.
  10. 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.).

11.2.1.3. Membrane Gutters and Gutter Liners

  1. 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).
  2. A reinforced liquid membrane systems (PMMA or PUMA) approved for field use and applied to an accepted SBS-modified base membrane is acceptable as a gutter membrane.
  3. 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

  1. 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

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

11.2.1.6. Liquid Membrane Flashing

  1. Only a RoofStar-accepted reinforced two-component catalyzed polymethyl methacrylate (PMMA) liquid membrane flashing system may be used on the water plane to flash roof drains, scuppers, and overflows.

Section 11.3. Application

11.3.1. Guarantee Term Requirements

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

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

11.3.1.2. 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 or RoofStar 10-year Guarantee.

11.3.2. All Systems

11.3.2.1. Condition and Suitability of Roof Drains

  1. 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")

  1. Roof drains for new construction projects must be located at least 304.8 mm (12”) away from any adjacent drain, penetration, upstand, edge, or wall (the separation space is measured between openings, excluding the flange).
  2. The 304.8 mm (12”) spacing requirement for roof drains does not apply to overflows, scupper drains, and drains used in membrane gutters.
  3. 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

  1. All roof drains must be supplied and installed with a secured strainer to prevent debris from blocking the drain.

11.3.2.4. Membrane Flashing

  1. Drains must be flashed using the membrane specified and installed to waterproof a gutter, and shall be acceptable to the Guarantor.
  2. 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

  1. Cast-iron roof drains must be installed by the plumbing/mechanical trade.
  2. 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.
  3. Drain extensions for cast-iron roof drains should be avoided.
  4. Existing flow restrictors removed during roof construction should be reinstalled.
  5. 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.
  6. The continuity of air and vapour control layers must be maintained, where the controls are specified.

11.3.3.3. Cast-iron Drains Installed with Lead Flashing

  1. Cast-iron roof drains installed with lead flashing shall conform to the requirements of Article 11.3.3.3. in the Standard for the membrane used to waterproof the drain.

11.3.3.4. Cast-iron Drains Installed with Membrane Flashing

  1. Cast-iron roof drains installed with sheet membrane flashing shall conform to the requirements of Article 11.3.3.4. in the Standard for the membrane used to waterproof the drain.

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

  1. Cast-iron roof drains retrofitting shall conform to the requirements of Article 11.3.3.5. in the Standard for the membrane used to waterproof the drain.

11.3.3.6. Flanged Insert-type Roof Drains

  1. Flange-type roof drain installation shall conform to the requirements of Article 11.3.3.6. in the Standard for the membrane used to waterproof the drain.

11.3.3.7. Scuppers and Overflows

  1. Scupper and overflow installation shall conform to the requirements of Article 11.3.3.7. in the Standard for the membrane used to waterproof their installation.

11.3.3.8. Membrane Gutters

  1. All gutter membrane construction shall conform to the requirements of Article 11.3.3.8. in the Standard for the membrane used in related waterproofing applications.

11.3.3.9. External Gutters

  1. When external gutters are attached to an Architectural Sheet Metal Roof System, they shall not interfere with the free movement of water or air away from the roof system.



Part 12 - Penetrations and Curbs

Section 12.1. Design

12.1.1. General

12.1.1.1. Scope

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

12.1.1.2. Definitions

  1. Words that appear in italics are defined in the Glossary.

12.1.2. Guarantee Term Requirements

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

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

12.1.2.2. 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 or RoofStar 10-year Guarantee, and shall
    1. be designed to utilize the split panel detail; flexible boot flashings secured with gasketed screws are not permitted, and
    2. specify two storm collars separated by no more than 76.2 mm (3”), for all penetration flashings that do not incorporate a settlement cap.

12.1.3. All Systems

12.1.3.1. General Requirements for Penetrations

  1. Each roof opening must be enclosed and sealed
    1. with a curb, or
    2. a penetration flashing.
  2. Each penetration (except for clustered or bundled electrical cables) must be flashed separately from others.
  3. Single or bundled electrical cable penetrations must be flashed with a suitable goose-neck flashing, fitted with a weather head.
  4. Penetration flashings must be
    1. new,
    2. suitable for the type of penetration, and
    3. properly fitted to form a seal around the penetration, 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.
  5. Penetration flashings should be selected for their ability to inhibit the intrusion of vermin and insects into the roof assembly and building interior.
  6. 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. "SBS" Construction Detail 2-Part Retrofit Flashing (Cable Penetration)), or
    3. roof curbs fitted with customized metal hoods or square-to-round metal flashing.
  7. Flexible boot flashings for pipe-type penetrations
    1. may be used for penetrations up to 152.4 mm (6”) in diameter,
    2. should be located near the upper end of a slope for long panels,
    3. must not be located on the drainage plane when the roof slope is less than 1:6 (2” in 12”),
    4. must be located at or near the centre of metal roof panels, measured between the upstands, to avoid interference with standing seams or panel ribs, or in the alternative (when interference is unavoidable) on a raised panel above seam height,
    5. must be fastened with high-domed gasketed cladding screws placed no more than 38.1 mm (1-1/2") O.C., and
    6. must be set in a bed of sealant.

12.1.3.2. Reserved

12.1.3.3. Separation Between Details

  1. 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.
  2. 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 and Sleepers

  1. The design and placement of curbs and sleepers shall be the responsibility of the Design Authority, but shall in any event conform to the application requirements in Article 12.3.2.4.
  2. Curbs
    1. must be designed for securement directly to the deck structure, or to intermediate blocking (they must not be situated on top of the roof system), and
    2. shall be designed to achieve a minimum height of 203.2 mm (8”), measured from the surface of the drainage plane (not including panel seam upstands), or from the highest point of a curb cricket.
  3. Curbs with a width
    1. less than 914.4 mm (36”) may be designed with a cricket but require, as a minimum, a back-pan flashing,
    2. between 914.4 mm (36”) and 2438.4 mm (96") require an architectural metal cricket with rigid support, to prevent metal distortion, and
    3. greater than 2438.4 mm (96") must
      1. be designed to divert and drain the anticipated volume of water above the curb,
      2. incorporate a cricket, fully supported with insulation or framing and designed to direct water and snow to either side of the curb, and
      3. incorporate a waterproofed gutter membrane installed over the cricket (Also see Article 11.1.4.3., Membrane Gutters).
  4. A waterproofed gutter membrane around a curb
    1. shall have a minimum slope of 2%, along the up-slope face of the curb, to direct water around the curb and toward the eaves,
    2. should be continuous along the sides of the curb, as dictated by the curb size and roof slope, or fall, and
    3. must direct water onto the lower metal panels.
  5. 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.

12.1.3.5. Attic Ventilation

  1. The design and selection of the ventilation system is the responsibility of the Design Authority, and may be achieved by incorporating into the roof design both intake and exhaust vents, including (without limitation),
    1. eave vents,
    2. gable end vents,
    3. hip vents,
    4. static vents,
    5. ridge vents, and
    6. cupolas.
  2. Attic (roof cavity) ventilation
    1. must meet the minimum requirements of the Code having jurisdiction, even in conditions where snow cover is present (See the "British Columbia Building Code", Division B, Article 9.19.1.3., "Clearances") (Roofs that do not provide adequate ventilation do not qualify for a RoofStar Guarantee), and
    2. shall be suitable for
      1. the slope of the roof,
      2. the vented area, and
      3. the design and configuration of the roof structure, and
    3. shall be provided for roofs over cathedral ceilings.
  3. Continuous ridge venting systems
    1. are acceptable and are recommended for all areas with vaulted ceilings.
    2. may be installed on slopes 1:3 (4” in 12”) and greater, but application on slopes less than 1:3 must be permitted by manufacturer’s published installation instructions.

12.1.3.6. Railings, Ladders, and Other Attached Structures

  1. Railings, ladders, and other attached structures shall not be affixed to metal panels and should be designed for attachment to vertical surfaces only.

Section 12.2. Materials

(See Division C, "Accepted Materials")

12.2.1. Material Properties

12.2.1.1. Membranes Used for Flashing

  1. See Article 8.2.1.2. for sheet membrane requirements.
  2. Regardless of the type or thickness of underlayment used in the field, all membrane flashing for changes in plane shall achieve a minimum finished thickness of 3 mm.

12.2.1.2. General Requirements for Penetration Flashings

  1. 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. of sufficient height to extend vertically (when measured from the up-slope base of the flashing upstand to the opening at the top) at least
      1. 203.2 mm (8”), for slopes 0 to 1:6 (2” in 12”),
      2. 152.4 mm (6”), for slopes greater than 1:6 and equal to 1:3 (4” in 12”), or
      3. 101.6 mm (4”), for slopes greater than 1:3.
  2. 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.
  3. In regions that experience high snow accumulations, penetration flashings taller than the stated minimums in this Article are strongly recommended.
  4. 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.
  5. Chimney chase caps must be
    1. galvanized metal conforming to the requirements in Article 13.2.1.2.,
    2. fabricated with penetration collars at least 152.4 mm (6") in height,
    3. soldered at all joints in the drainage plane, and
    4. fabricated with slope to shed water.

12.2.1.3. Flashings for Heating and Plumbing Systems Penetrations

  1. Lead plumbing vent flashings must each be
    1. fabricated with sheet lead material weighing no less than 14.65 Kg/m2 (3lb/sf),
    2. properly sized for the pipe, and
    3. supplied with a settlement cap made from the same materials (the inside collar of the settlement cap must fit vertically inside the pipe opening by at least 25.4 mm (1”)).
  2. 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. Air Vents

  1. Vents, regardless of their type, must be either
    1. proprietary to, or privately labeled for, the panel manufacturer, or
    2. specifically accepted by the RoofStar Guarantee Program (See Article 12.2.1.2.).
  2. Ridge vents must be
    1. fabricated from a compatible metal,
    2. acceptable to the metal panel manufacturer,
    3. suitable for slopes 1:4 and greater, and
    4. constructed with internal baffles to prohibit the intrusion of
      1. insects,
      2. vermin,
      3. snow, and
      4. debris.
  3. Natural air flow vents must be
    1. Type B or C ventilators conforming to CAN3-A93-M82 (R2003), "Natural Airflow Ventilator for Buildings", and permanently marked with the standard number,
    2. tested by an accredited third party to verify compliance with the required Standard,
    3. fabricated from plastic or corrosion-resistant metal (painted or unfinished), and
    4. manufactured with a base flange that measures
      1. at least 76.2 mm (3”) wide on the up-slope side of the flashing, or
      2. at least 50.8 mm (2”) along the vertical sides, and along the bottom side of the flashing.

Section 12.3. Application

12.3.1. Guarantee Term Requirements

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

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

12.3.1.2. 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 or RoofStar 10-year Guarantee, and shall
    1. incorporate only the split panel detail for flashing penetrations (use of a flexible boot flashing secured with gasketed screws is not permitted), and
    2. incorporate no fewer than two storm collars for each penetration flashing that does not include a settlement cap; each collar must be separated from the other by no more than 76.2 mm (3”).

12.3.2. All Systems

12.3.2.1. General Requirements for Flashing Penetrations

  1. All penetration flashing materials must be new.
  2. All penetrations must be flashed to seal the penetration where it passes through the deck and underlayment, and must prevent water ingress at least 203.2 mm (8") above the finished roof system surface.
  3. 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 fitted to form or permit a seal around the penetration.
  4. All curbs or penetrations that can be flashed with sheet membrane shall, regardless of their geometry, be flashed with a high-temperature rated membrane which must positively lap field underlayment, and must be carried
    1. at least 101.6 mm (4”) up the face of the penetration (on insulated assemblies),
    2. no higher than the top of a flexible boot penetration.
    3. to the top inside edge of curbs, and
    4. onto field by at least 152.4 mm (6”).
  5. 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), or
    2. a curb waterproofed with sheet membrane and flashed with sheet metal, and fitted with a customized sheet metal hood (shaped to function like a weather head).
  6. 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.
  7. A cylindrical penetration flashing (i.e., for a pipe)
    1. with a maximum opening diameter equal to or less than 152.4 mm (6”) may be installed on a curb, but shall in any case be flashed with a flexible boot flashing, or with a rigid metal pipe flashing.
    2. with a maximum opening diameter greater than 152.4 mm (6”), and all exhaust flues (B-vents), may not be flashed at the drainage plane and instead must be installed on a curb (see ASM 11.2.1 Curb, Split Panel).
  8. When a cylindrical penetration extends above the top edge of the its flashing, so that it cannot be sealed with a settlement cap, the penetration must be fitted with at least one properly fitted, level, galvanized clamping storm collar placed immediately above the top opening of the flashing.
  9. A flexible boot flashing used with cylindrical penetration is permissible, provided
    1. the penetration is fitted with a properly sized and caulked galvanized storm collar,
    2. the flexible boot flashing
      1. is located so as not to interfere with standing seams or panel ribs. If interference is unavoidable, incorporate the raised panel detail,
      2. is oriented diagonally to promote drainage around the flashing base and permits at least 12.7 mm (1/2") drainage past the corners.
      3. is sealed in a continuous bead of untooled sealant,
      4. is fastened with gasketed screws spaced no more than 38.1 mm (1-1/2") O.C.,
      5. is secured around the penetration with a stainless-steel clamping ring, but when a clamping ring cannot be installed, the top of the flashing must be protected with a caulked, galvanized storm collar, and
      6. is sealed around the penetration joint with a bead of sealant, and
    3. the plumbing trade (for new construction only) ensures
      1. the flashing is not distorted, and
      2. a storm collar is securely fitted and caulked with sealant.
  10. 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.
  11. When two storm collars for one penetration are specified, the collars must be approximately 25.4 mm (1”) apart, and each must be independently sealed.
  12. 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 (Ref. Figure 12.3.2.-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).
  13. Chimney chase caps that are included in the scope of roofing work
    1. shall be fabricated to meet the requirements set out in Article 12.2.1.2.,
    2. must be fully supported beneath the flashing,
    3. must be waterproofed beneath the cap flashing with a RoofStar-accepted self-adhered eave protection membrane installed according to the membrane manufacturer’s written instructions (Ref. Article 8.2.1.2.), and
    4. shall be sealed at the penetration collars with the waterproofing membrane.
  14. Cylindrical penetrations through chimney chase caps that form part of the roofing work must be fitted with a properly sized galvanized storm collar, caulked with sealant.

12.3.2.2. Reserved

12.3.2.3. Separation Between Penetration Flashings

  1. 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.
  2. Penetrations that are closer together than the allowable minimum distance must be supported by a written Variance issued by the Guarantor.

12.3.2.4. Curbs and Sleepers

  1. All curb flashing shall be constructed on a split pan and affixed to the pan with blind rivets.
  2. Split pans must be
    1. secured to the roof structure, and to adjacent panels, with cleats that are fashioned from compatible metal and fastened to the structure with screws.
    2. hooked to the cleats, and to adjacent roof panels, shingle fashion with positive laps, and
    3. sealed at each lap with two parallel untooled beads of sealant.
  3. All curbs must be fully flashed with the same membrane used for eave protection and valleys, and must extend to the top of the curb.
  4. Where possible, membrane flashing should extend across the top of the curb and terminate on the vertical inside face.
  5. Skylights installed on curbs meeting the minimum height requirements (see Article 12.1.3.4.) must be waterproofed with membrane and flashed with sheet metal in keeping with the requirements for curbs.
  6. Skylights with proprietary curbs, regardless of their height, must be sealed to the roof deck following the requirements for penetration and vent flashings.
  7. Back pan membrane flashing must extend
    1. at least 101.6 mm (4”) up the face of the penetration (on insulated assemblies),
    2. to the top inside edge of curbs,
    3. 914.4 mm (36") up the slope from the curb transition, and
    4. onto the field, past the curb at least 152.4 mm (6”).
  8. Back-pan metal flashings for curbs up to 914.4 mm (36”) in width must extend
    1. past the edges of a curb by 101.6 mm (4”) but project no closer to the adjacent seam than 51 mm (2”), and
    2. up the slope beneath the metal panels, to a point at least 150 mm (6”) (when measured vertically) from the base of the curb.
  9. Curbs with widths 914.4 mm (36”) to 2438.4 mm (96") must be constructed with a metal cricket
    1. that is supported by rigid material to prevent metal distortion,
    2. that is integrated with the curb flashing panels,
    3. that extends up-slope from the back of the curb, beneath the metal panels to a point at least 152.4 mm (6”) (when measured vertically) from the base of the curb,
    4. fabricated with flanges that lap under the metal curb flashing at least 50.8 mm (2”), and
    5. that is closed at all seams, using
      1. welds, or
      2. blind rivets, incorporating two beads/rows of sealant.
  10. Waterproofed gutter membranes for curbs wider than 2438.4 mm (96") must slope toward the eaves at least 2%, and shall
    1. extend up the slope at the back of the curb, beneath the metal panels, to a point at least 152.4 mm (6”) (when measured vertically) from the base of the curb,
    2. extend horizontally from the curb at least 254 mm (10”), to the nearest metal panel upstand,
    3. lap continuously on either side of the curb, and onto the down-slope metal panels, and
    4. extend a minimum of 152.4 mm (6") over the lower metal roof panels, measured from the back pan.
  11. Fasteners for metal panels installed above the back of the curb must be placed 101.6 mm (4") or more above the curb base, when measured vertically.

12.3.2.5. Air Vents

  1. Air vents shall be installed in keeping with the requirements in Article 12.3.2.1..

12.3.2.6. Liquid Membrane Flashing

  1. 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.
  2. 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).
  3. 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.
  4. Single-component polyurethane and silicon-based liquid membrane flashing system
    1. must be accepted by the Guarantor, acceptable to the manufacturer, and shall be listed in Division C,
    2. may be used
      1. to coat galvanized flashings used in the water plane, provided the application follows the requirements in Article 12.3.2.2., "Galvanized Penetration Flashings",
      2. to flash details more than 101.6 mm (4”) above the water plane, that cannot be sealed with sheet-type membranes, or
      3. 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.
  5. 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.-B (Click to expand)
Figure 12.3.-B (Generic).jpg

12.3.2.7. Railings, Ladders, and Other Attached Structures

  1. 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 drainage plane.
  2. 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.
  3. Railings, ladders, and other structures shall not direct water into a roof system by means of weep holes or the method of fastening.

12.3.2.8. Reserved


Part 13 - Linear Metal Flashing

Section 13.1. Design

13.1.1. General

13.1.1.1. Scope

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

13.1.1.2. Definitions

  1. 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 a metal flashing fashioned from sheet metal, affixed to the roof assembly, and designed to divert water away from the membrane flashing termination, usually onto the primary waterproofing or water-shedding surface. Linear metal flashing also protects the membrane from weathering and damage and provides an aesthetic finish to the roof system.

13.1.2. Guarantee Term Requirements

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

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

13.1.2.2. 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 or RoofStar 10-year Guarantee.

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))

  1. 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.
  2. 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.
  3. Design drawings must detail metal flashing profiles desired for the project.
  4. Roof materials that are UV-sensitive must be protected with metal flashings.
  5. Where an adjoining waterproofing roof system is specified as part of the Contractor's scope of work, the design specifications for linear metal flashing shall conform to the design requirements in the applicable waterproofing roof system Standard.

13.1.3.2. Information Required in Specifications

  1. 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).
  2. Design drawings must detail metal flashing profiles desired for the project.

13.1.3.3. Securement

  1. 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

  1. Gauge, dimensions, slope, and length of linear metal flashings must be specified to conform to the requirements in Table 13.1.-A and Article 13.2.1.2., but shall not be less than 24-Gauge.
  2. Specified seam types shall conform to the requirements in Table 13.1.-B and Article 13.3.2.2.
  3. Except for metal valley flashings (See Article 10.3.4.2.), linear metal flashings may be overlapped rather than seamed; each overlap must be no less than
    1. 101.6 mm (4”) when fully caulked in the lap, or
    2. 152.4 mm (6”) when installed without caulking in the lap.
  4. Sealants used in exposed locations must be tooled to positively shed water.
Table 13.1. Pre-finished Galvanized Steel Cap (Coping) Flashing (Gauge and Length Standards)
Horizontal Span Minimum
Slope
Gauge Maximum Flashing
Segment Length
Seam Options
Up to 304.8 mm (12") 2% 24 3048 mm (120") S-lock or Standing Seam
22+ Butt Seams*
300 - 900 mm (12" to 36") 4% 24 3048 mm (120") S-lock or Standing Seam
22+ Butt Seams*
900 mm or greater 6% 24 1219.2 mm (48") S-lock or Standing Seam
22+ Butt Seams*
* Refer to Article 13.3.2.2., "Seams"
Table 13.2. Pre-finished Galvanized Steel Vertical Flashing (Gauge and Length Standards)
Vertical Face Gauge Maximum Flashing
Segment Length
Vertical Seam Options
Up to 152.4 mm (6") 24 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*
* Refer to Article 13.3.2.2., "Seams"

13.1.3.5. Fit and Finish

  1. Fit and finish of all linear metal flashings shall conform to the requirements in Subsection 13.2.2.
  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.).

13.1.3.6. Cap and Counter-flashing

  1. Cap flashing and counter-flashing specified for an adjoining waterproofing roof system or membrane gutter shall conform to the design requirements in the applicable waterproofing roof system or gutter membrane Standard .

13.1.3.7. Intersections with Other Assemblies

  1. Refer to Article 10.3.7.2.

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

  1. 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

  1. A mill certificate must be provided by the Contractor when requested by the Design Authority.
  2. 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 0.6858 mm (0.027", 24-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. Aluminum-Zinc alloy-coated steel: minimum 0.6858 mm (0.027", 24-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").
  3. 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. 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. 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.
    4. 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").
  4. Specifying authorities should indicate the type and gauge of metal required, as well as the qualifying standards.
  5. 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

  1. Fasteners must be
    1. threaded screws, or rivets (where permitted),
    2. compatible with materials they contact,
    3. corrosion-resistant,
    4. identified in the engineered design, when part of the roof system’s wind resistance calculations (Ref. Article 3.1.3.3., “Resistance to Specified Wind Loads”),
    5. specified by the Design Authority, and
    6. appropriately sized, in both length and thread type, for the material to which they will be secured.
  2. Nails are not acceptable as fasteners.
  3. Notwithstanding the requirements in Sentence (1), threaded fasteners used to secure linear metal flashings
    1. in concealed locations must be at least No. 8 (larger if required by the engineered design), with a low-profile head.
    2. in exposed locations must be at least No. 10. (larger if required by the engineered design), shall be gasketed (cladding screws), and must match the colour of the materials they fasten.
  4. Rivets shall be closed-end, dome-head type, and shall be used only for fastening together linear metal flashings.

13.2.1.4. Sealants

  1. 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.
  2. Sealants shall conform to any one of the following:
    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”.
    4. CAN / CGSB-19.24, “Multi-Component, Chemical Curing Sealing Compound”.

13.2.2. Fabrication and Finish

13.2.2.1. Fabrication of Flashing

  1. 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.
  2. Unless expressly accepted otherwise, all linear metal flashing fabricated by the Contractor shall conform to the requirements in this Part.
  3. Where an adjoining waterproofing roof system is specified as part of the Contractor's scope of work, the fabrication of linear metal flashing shall conform to the requirements in the applicable waterproofing roof system Standard.
  4. 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.
  5. 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 3048 mm (120").
  6. 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.
  7. 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),
    3. a sloped drop of no less than 101.6 mm (4").
  8. 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).

13.2.1.3. Pre-painted Finishes

  1. When a painted finish on linear metal flashing is specified, only SMP and PVDF pre-painted finishes are acceptable.
  2. 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 and RoofStar 10-year Guarantee

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

13.3.1.2. 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 or RoofStar 10-year Guarantee.

13.3.2. All Systems

13.3.2.1. General Requirements for Linear Metal Flashing

  1. RoofStar-accepted pre-engineered securement systems must be secured according to the manufacturer’s specifications.
  2. All linear metal flashing installed over an organic substrate (i.e., wood) shall be separated from the substrate with a suitable underlayment or eave protection material (Ref. Section 8.2.).
  3. Unless otherwise provided for in this Part, mechanical fasteners used to secure linear metal flashing
    1. shall be spaced no more than 304.8 mm (12”) O.C.,
    2. must penetrate the substrate as specified in Article 3.3.2.1., and
    3. must be installed at least 88.9 mm (3-1/2") above the finished roof system surface.
  4. 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").
  5. Continuous concealed clips must be attached with fasteners spaced nor more than 304.8 mm (12") O.C.
  6. 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.
  7. Where an adjoining waterproofing roof system is specified as part of the Contractor's scope of work, the work shall conform to the installation and seam requirements in the applicable waterproofing roof system Standard.
  8. 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.)

  1. RoofStar-accepted pre-engineered linear metal flashing may be joined together using seams specified for the accepted flashing.
  2. All linear metal flashing that is not pre-engineered must be seamed together following the requirements set out in this Article.
  3. All seams must allow for metal expansion and contraction.
  4. 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.
  5. Straight (linear) joints between lengths of linear metal flashing must be fully seamed using only an S-lock (Figure 13.3.2.-A) or Standing Seam (Figure 13.3.2.-B), but this requirement does not apply to
    1. flashing fashioned from 22-gauge metal (or heavier),
    2. continuous eave flashing to which the metal panels are secured , or
    3. 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.
  6. The top face (horizontal plane) of flashings that intersect at a corner (i.e., coping flashing) must be joined with a standing seam.
  7. Where drip edges meet at an outside corner, the cut edges of the mitred joint must be mechanically connected (closed with a "rat tail").
  8. 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").
  9. 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.
  10. 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").
  11. 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.
  12. 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.
  13. 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.
  14. 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.-A (Click to expand)
13.3.1
Figure 13.3.2.-B (Click to expand)
13.3.2


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

  1. The installation of cap flashing and counter-flashing specified for an adjoining waterproofing roof system or membrane gutter shall conform to the application requirements in the applicable waterproofing roof system Standard .

Part 14 - The Roof as a Platform

Section 14.1. Design

14.1.1. General

14.1.1.1. Scope

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

14.1.1.2. Definitions

  1. Words that appear in italics are defined in the Glossary. Additionally, the following terms are used in this Part:
    1. 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 and RoofStar 10-year Guarantee

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

14.1.2.2. 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 or RoofStar 10-year Guarantee.

14.1.3. All Systems

14.1.3.1. Coverage and Limitations

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

14.1.3.2. Loads

  1. 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.

14.1.3.3. Securement of Supported Structures and Equipment

  1. The Design Authority is responsible to specify the appropriate securement design of roof coverings, structures, and equipment, to resist Specified Wind Loads.
  2. Where structural securement is desirable or required, 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. Snow Guards

  1. While snow guards are not part of the roof system, snow guards
    1. must not penetrate the metal roof system, and
    2. shall be designed in consultation with a registered professional skilled in the work concerned ("British Columbia Building Code", Division C, Section 2.2., "Administration").
  2. The decision to use snow guards, and their selection, is the responsibility of the Design Authority and neither the Guarantor nor the Contractor will accept any responsibility for damage to, or failure of, the roof system caused by the use or absence of snow guards.

14.1.3.5. Photovoltaic Panels

  1. Photovoltaic panels are considered "equipment" within the definitions used in this Standard, are not part of the roof system, and therefore photovoltaic panels
    1. must not penetrate the metal roof system, and shall be designed in consultation with a registered professional skilled in the work concerned ("British Columbia Building Code", Division C, Section 2.2., "Administration").
  2. All electrical connections, distribution cables, and related systems that penetrate the roof system must be flashed with purpose-made flashings incorporating weather-head fittings (see Article 12.2.1.2.; see also Subsection 2.1.8., Electrical Cables and Boxes).



Notes to Standard

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