Template:Part 8 - PVC
Template:Part 8 - PVC
Revision as of 15:36, 16 November 2021 by James Klassen (talk | contribs) (→Use Over Mineral Fibre Insulation)
1 Design
(See Note A-8.1)
1.1 General
1.1.1 Scope
- The scope of this Part and the Standard shall be as described in Part 1 of Division A in this Manual.
1.1.2 Definitions
- Words that appear in italics are defined in the Glossary.
1.2 Guarantee Term Requirements
1.2.1 RoofStar 5-year and RoofStar 10-year Guarantee
- All projects intended to qualify for a RoofStar 5-year or RoofStar 10-year Guarantee shall comply with the requirements in this Part.
1.2.2 RoofStar 15-Year Guarantee
- All projects intended to qualify for a RoofStar 15-year Guarantee shall comply with the requirements in this Standard for a RoofStar 5-year or RoofStar 10-year Guarantee, together with the following:
- An insulation overlay is required for all insulated systems, regardless of the insulation type, and overlays must
- be at least 6.4 mm (1/4”) thick, and
- possess a compressive strength of at least 690 kPa (100 psi).
- An insulation overlay is required for all insulated systems, regardless of the insulation type, and overlays must
1.3 All Systems
1.3.1 Use Over Sensitive Materials and Systems
- Notwithstanding the requirements in Part 7 concerning heat-sensitive insulation, an insulation overlay of one or more layers is required over all flat and sloped board-type insulation, and on insulation installed on vertical surfaces,
- if the compressive strength of the insulation is less than 110 KPa (20 psi),
- if the membrane is self-adhered or will be applied with a torch flame, adhesives or hot bitumen, or
- if a Conventionally Insulated System supports an overburden; these roof systems must be designed with at least one layer of adhered overlay (asphaltic overlays, moisture resistant fibreglass-faced silicon treated gypsum core overlays, high-density insulation overlays, composite or membrane-laminated overlays) capable of supporting any superimposed loads on the exposed membrane, without compression or distortion of the roof system or any one of its components (see also Article 14.1.2.1).
- The requirement to use an insulation overlay does not apply to the field application of
- self-adhered membranes
- expressly accepted by the Guarantor for application directly on specific insulation types without the use of an overlay, or
- expressly approved (in published literature) by the manufacturer for application directly on an insulation panel.
- self-adhered membranes
- Heat-sensitive crickets used in membrane systems applied with a torch flame or hot bitumen must be overlaid using either
- one layer of panels,
- at least 12.5 mm (1/2”) thick,
- offset from insulation joints by at least 300 mm (12”), and
- continuously sealed with a flame-impervious tape along all joints with adjacent panels, or
- two layers of panels,
- each at least 4.8 mm (3/16”) thick, and
- offset from each other, from the adjacent layer, and from insulation joints by at least 300 mm (12”).
- one layer of panels,
1.3.2 Use Over Mineral Fibre Insulation
- An insulation overlay is not required when torch-applied membranes are installed directly on mineral fibre insulation treated with a thermofusible bitumen top surface (This exception is subject to the requirements for mineral wool insulation published in Part 7 INSULATION).
- When an overlay board is required over mineral wool insulation, the overlay board must be a moisture resistant fibreglass-faced silicon treated gypsum core board measuring at least 12.7 mm (1/2") thick (See also 7.2 Materials concerning mineral wool insulation).
2 Materials
(See Division C: Accepted Materials)
2.1 Material Properties
2.1.1 Insulation Overlay Dimensions
- Regardless of the type of insulation overlay, the overall thickness of insulation overlay boards shall not exceed 50 mm (2”) (See minimum allowable thicknesses are shown in Table 8.1).
- Asphalt-coated fibreboard roof insulation adhered with hot asphalt or an asphalt-based adhesive must be asphalt-coated on the top and bottom surface (Minimum coated two-sides).
- Fire guard tape must be 150 mm (6”) wide
- self-adhering modified bituminous tape acceptable to the membrane manufacturer, or
- Type IV fibreglass felt or No. 15 organic felt, applied with hot bitumen or cold adhesive.
Table 8.1 Insulation Overlay Minimum Thicknesses Overlay Type Minimum Thickness - mm (in.) Asphaltic core 4.8 (3/16") Moisture resistant fibreglass-faced silicon treated gypsum core 6.4 (1/4") High-density insulation 12.7 (1/2") Membrane-laminated overlays and Composites As listed in this Manual Fibreboard As listed in this Manual Mineral wool As listed in this Manual
3 Application
3.1 Guarantee Term Requirements
3.1.1 RoofStar 5-year and RoofStar 10-year Guarantee
- All projects intended to qualify for a RoofStar 5-year or RoofStar 10-year Guarantee shall comply with the requirements in this Part.
3.1.2 RoofStar 15-Year Guarantees
- All projects intended to qualify for a RoofStar 15-year Guarantee shall comply with the requirements in this Standard for a RoofStar 5-year or RoofStar 10-year Guarantee, together with the following:
- An insulation overlay must be installed in all insulated systems, regardless of the insulation type.
- Insulation overlays must
- be at least 6.4 mm (1/4”) thick, and
- possess a compressive strength of at least 690 kPa (100 psi).
3.2 All Systems
3.2.1 Alignment of Overlays
- See the Design requirements in Section 1 of this Part.
- Insulation overlays
- should be square and should make firm, full contact with adjacent panels unless specified otherwise by the manufacturer, and
- must be offset at least 300 mm (12") from the joints of the insulation layer; a minus offset tolerance of 50 mm (2") maximum is permissible.
- When multiple layers of an insulation overlay are specified, the joints between boards must be offset/staggered at least 300 mm (12") from adjacent layers and rows (See Figure 8.1. See also Part 7 INSULATION.
Figure 8.1 (Click to expand)
3.2.2 Mechanical Securement
- When mechanically attaching insulation overlay boards, the insulation and overlay boards may be fastened together as one assembly.
- Unless otherwise indicated by the system requirements in a Tested Assembly, follow the fastener patterns set out in Part 3 SECURING the ROOF ASSEMBLY.
- When a membrane-laminated overlay is mechanically fastened over insulation, fasteners and plates used in the field of each panel must be covered with torch-applied polyester or composite-reinforced membrane patches that extend past the edge of each plate at least 50 mm (2”).
3.2.3 Adhered Securement
- Adhered overlays must conform to the Design requirements in Section 1 of this Part.
- Roof system components adhered with two-component low-rise polyurethane foam must be
- installed immediately in wet adhesive (before a surface skin develops), applied
- in parallel runs or in a Z-pattern, no more than 150 mm (6”) from any edge of the board and spaced no more than 300 mm (12”) apart,
- to a clean, dry and contaminant-free surface, and
- in ribbon widths specified by the adhesive manufacturer or, in the absence of manufacturer requirements, 19 mm (3/4”) wide.
- properly placed and weighted in wet adhesive until cured.
- installed immediately in wet adhesive (before a surface skin develops), applied
- Hot bitumen used to adhere a roof assembly
- must be applied at minimum rates and temperatures based on the type of product, as published by the material manufacturer and in the RoofStar Guarantee Standards for Built-up Roof (BUR) Systems, and
- may be applied on slopes up to 1/2:12 (for steeper slopes, select a different method of securement).