TPO/PVC Guide Specification

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TPO/PVC Guide Specification


Intended as a guide for developing office master specifications or preparing project specifications. Edit and amend to suit required purpose.

SECTION 07530 PROJECT NO. (OPTIONAL) THERMOPLASTIC SHEET ROOFING PROJECT NAME (OPTIONAL) PAGE 1 OF [ ]

PART 1 - GENERAL
1.1 Work Included
(this clause is optional and, if using, ensure description of work is complete.)
1.2 Related Work: (reference appropriate sections and ensure list is complete) eg
.1 Section 06100 Rough Carpentry (Cants, Blocking, etc.)
.2 Section 07600 Flashing and Sheet Metal
.3 Section 15440 Plumbing (Supply of Roof Drains)
1.3 Quality Assurance:
1.3.1 Workmanship Standards:
.1 Conform to the latest Guarantee Standards of the Roofing Contractors Association of British Columbia (RGC) as published in the “RCABC Roofing Practices Manual” for a five (5) or ten (10) year Guarantee, unless modified by the contract documents to exceed those minimums.
.2 The owner or the owner's representative should identify applicable code and insurance requirements relating to the roof assembly.
1.3.2 Qualification of Workers: employ skilled applicators approved by membrane manufacturer.
1.3.3 Independent Inspection: (Preferred Wording)
.1 Perform using an independent inspection company acceptable to RGC, [the owner, the consultant, and the membrane manufacturer] namely: (name of Inspection Company).
.2 Perform as required by RGC under the five (5) or ten (10) year Guarantee Program.
.3 Inspection costs for the Guarantee will be paid for directly by owner, and are not included in this contract.
1.3.4 Independent Inspection: (Optional Wording)
.1 Perform using an independent inspection company acceptable to RGC, [the owner, the consultant, and the membrane manufacturer] to be assigned by RGC.
.2 Perform as required by RGC under the five (5) or ten (10) year Guarantee Program.
.3 Inspection costs for this Guarantee are included in this contract.
1.4 Submittals:
.1 Provide the owner with an “RGC Roofing System Record” upon completion of this contract. (Includes RoofStar Guarantee, copies of inspection reports, and Roof Maintenance Guide.)
.2 Provide the owner with one set of any required Material Safety Data Sheets (MSDS) prior to commencement of work, for review and posting on job site.
.3 Provide the owner with one set of any required Material Safety Data Sheets (MSDS) prior to commencement of work, for review and posting on job site.
.4 List other submittal requests here, eg: shop drawings, samples, product literature, etc.
1.5 Product Delivery, Storage, and Handling:
.1 Deliver and store materials in original containers with manufacturers' labels and seals intact; consult material data sheets for shelf life of each material; do not use materials with expired shelf life.
.2 Store materials elevated from contact with ground and moisture and protected from weather.
.3 Store membrane rolls flat and dry and fully protected from moisture.
.4 Store adhesives and caulkings at temperatures above [+5°C (+40°F)]; consult membrane manufacturer for specific recommendations.
.5 Avoid prolonged exposure of light and heat sensitive materials to sunlight.
.6 Store combustible materials away from heat and open flame.
.7 Protect membranes from contact with bituminous materials.
.8 Store materials in a safe manner; do not exceed the allowable live load of the storage area; (the design authority is responsible for determining if the structure will support the required load.)
.9 Consult the manufacturer's material safety data sheets for materials on this project.
1.6 Guarantee:
.1 Provide the standard Roofing Contractors Association of British Columbia (RGC) five (5) or ten (10) year Guarantee.
PART 2 - PRODUCTS
2.1 Roofing Materials:
.1 Standards: conform to the RGC Guarantee Standards and to the appropriate CSA, CGSB, ULC, and ASTM Standards for the materials used in the roofing system specified; use materials listed in the RGC Accepted Materials List of the RCABC Roofing Practices Manual.
.2 Standards: (optional); conform to the requirement of ULC Design No.[ ]. (The design authority is responsible for identifying applicable code and /or insurance requirements governing material selection.)
.3 Use only components supplied or accepted by membrane manufacturer.
.4 Gypsum: (over steel deck as membrane underlay or thermal barrier); minimum [12.7 mm (1/2")] [15.9 mm (5/8")] thick; 1200 mm x 2400 mm (4' x 8') sheets; [standard] [type X] [siliconized with fibreglass facers]; conform to CSA A82.27-M1977.
.5 Gypsum Fasteners: No. 10 flat-head, countersunk, self-tapping screws, Type [A, AB], Philips, [cadmium-plated], [19 mm, 25 mm] [1/4", 1"] long, to CSA B35.3-1962.
.6 Vapour Retarder (the selection of, and the requirement for, the vapour retarder are determined by the design authority.)
.7 Separation Sheets: proprietary sheets approved by membrane manufacturer.
.8 Asphalt: (asphalt may be required for installation of a vapour retarder or insulation and must not come in contact with membrane); oxidized roofing asphalt conforming to [CSA A123.4-M1979, Type 3 (steep)] [ASTM D312-78, Type IV (special steep)].
.9 Filter Fabric: 100% woven polyolefin; proprietary alternatives approved by membrane / insulation manufacturer.
.10 Gravel Ballast: (for Protected Membrane and Modified Protected Membrane Roof Assemblies); clean, washed, round or crushed stone (use round for ballasted applications and crushed or rounded for inverted applications); gradations according to RGC Guarantee Standards.
.11 Membrane Fasteners: (proprietary type approved by membrane manufacturer).
.12 Termination Bars: (proprietary type approved by membrane manufacturer).
.13 Insulation Fasteners: [( ) mm] [( )"]; {screws and [plastic] [steel] stress plates} [RGC accepted nails (over wood decks only)]; (consult membrane manufacturer for specific requirements).
.14 Membrane Accessories: (List membrane manufacturer's proprietary accessories here. For Example: adhesives; sealants / mastics; prefabricated flashings; walkway pads; coatings, etc.)
2.2 Roof Insulation:
.1 Glass Fibre: conform to CAN / CGSB-51.31-M84; [top surface finished with asphalt-coated kraft paper]; ( ) mm [( )"] thick; [RSI ( )] [R ( )]; {tapered to provide 1: ( ) [( )" in 12"] slope, minimum thickness ( ) mm [ ( )"] at drains}.
.2 Extruded Expanded Polystyrene: conform to CAN / ULC-S701-97 Type [2,4]; [shiplapped] [butt] edges; ( ) mm [( )"] thick; [RSI ( )] [R ( )]; {tapered to provided 1: ( ) [( )" in 12"] slope, minimum thickness ( ) mm [( )"] at drains}.
.3 Expanded Polystyrene: conform to CAN / ULC-S701-97, Type [1,2,3,4,]; [shiplapped] [butt] edges; ( ) mm [( )"] thick; [RSI ( )] [R ( )]; {tapered to provide 1: ( ) [( )" in 12"] slope, minimum thickness ( ) mm [( )"] at drains}.
.4 Polyurethane: conform to {CGSB 51-GP-21M 1978 (unfaced polyurethane), Type [1,2,3], Class [1,2,3]} {CAN / CGSB-51.26-M86 (faced polyurethane), Type [1,2,3,4], Facing [1,2,3,4,], Surface Burning Characteristic [a,b] }; [with shiplapped edges] [channel-vented]; ( ) mm [( )"] thick; [RSI ( )] [R ( )].
.5 Polyisocyanurate: conform to {CGSB 51-GP-21M 1978 (unfaced polyisocyanurate), Type 4, Class [1,2,3] } {CAN / CGSB-51.26-M86 (faced polyisocyanurate), Type [1,2,3,4], Facing [1,2,3,4], Surface Burning Characteristic [a,b] }; ( ) mm [( )"] thick; [RSI ( )] [R ( )].
.6 Fibreboard: conform to CAN / CSA-A247-M86 Type 1; [shiplapped] [square] edges; ( ) mm [( )"] thick; [RSI ( )] [R ( )].
.7 Perlitic: conform to CAN / CGSB 51.10-92; ( ) mm [( )] thick; [RSI ( )] [R ( )].
2.3 Roof Membrane:
.1 Polyvinyl chloride membrane [non-woven glass fibre] [polyester] reinforced, [UV resistant]; conforming to CGSB 37-GP-54M 1979, Type [1, 2] Class [A, B, D].
.2 Ethylene propylene membrane, nominal (1.14 mm (0.045")][1.52 mm (0.060")] thickness, polyester reinforced Class [ABC].
PART 3 - EXECUTION
3.1 Preparation:
.1 Ensure membrane substrate is rigid, dry, smooth, compatible, free of fins and sharp edges, and clean of all debris and foreign matter.
.2 Ensure all openings, walls, and projections through the roof are firmly affixed and [cant strips,] reglets and nailing strips are in place. (Cant strips are not required by some membrane manufacturers).
.3 Satisfy the membrane manufacturer's specifications for substrate preparation prior to membrane application.
.4 A thermal barrier may be required between the roof deck and some insulations. Building code and insurance requirements to be identified by design authority.
3.2 Primer:
.1 Prime wood, concrete, and metal surfaces to be directly adhered with bituminous materials; allow to dry.
.2 Consult membrane manufacturer for specific requirements.
3.3 Vapour Retarder:
(The design authority determines the necessity for, and the placement of, the vapour retarder.
3.4 Insulation: (under membrane)
.1 Install insulation in moderate contact (without forcing); stagger end joints; provide a smooth surface to accept roof membrane.
.2 Install insulation according to RGC Guarantee Standards over nailable decks.
.3 Embed insulation in 1.5 kg / m² (30 lb / square) mopping of hot asphalt over non-nailable deck; (consult membrane manufacturer; mopping of insulation may not be allowed).
.4 Comply with membrane manufacturer's recommendations for loose-laid, ballasted, fully adhered, and mechanically-fastened systems.
.5 Install tapered insulation according to insulation manufacturer's shop drawings.
.6 Install only as much insulation as can be covered with roof membrane on the same day.
3.5 Separation Sheet
Required between roof membrane and glass fibre insulations incorporating an asphalt-coated kraft-paper top surface, and between roof membrane and polystyrene insulations in conventional applications. Separation may also be required between the membrane and a rough deck in inverted applications. Install according to membrane manufacturer's recommended specifications.
3.6 Mechanically Fastened Membrane:
3.6.1 ENGINEERED SYSTEM
.1 Unroll membrane and draw tight to minimize wrinkles and folds; lap adjacent sheets (50) mm (2") to fabricate hand-welded seams, and lap adjacent sheets (100) mm (4") to fabricate 38mm (1.5") machine-welded seams.
.2 Heat-weld seams according to Membrane manufacturers’ printed instructions.
.3 Place proprietary fastening bars over membrane and fasten through pre-drilled holes; bar and fastener placement to be determined by membrane manufacturer.
.4 Weld a membrane cover strip over each bar.
.5 Install continuous fastening bar at the base of perimeter and vertical flashings.
.6 Complete perimeter flashing details according to membrane manufacturer's details and specifications.
3.6.2 INSEAM FASTENING SYSTEM
.1 Unroll membrane and draw tight to minimize folds or wrinkles. Placement of rolls to be determined by manufacturer.
.2 Placement of proprietary fastening plates and fasteners to be determined by manufacturer. Fasten through bottom sheet into structural deck.
.3 Overlap top sheet [(150) mm (6")] onto bottom sheet.
.4 Heat-weld seams according to Membrane manufacturers’ printed instructions.
.5 Complete perimeter flashing details according to membrane manufacturer's details and specifications
3.7 Loose-Laid and Ballasted Membrane:
.1 Unroll membrane and draw tight without folds or wrinkles; lap sheets [(50) mm (2")] for hand-welded seams and [(100) mm (4")] for machine-welded seams.
.2 Heat-weld seams according to Item 3.9 "Seams".
.3 Install proprietary fastening bar around perimeter and penetrations greater than [600 mm (24")] in width and where specified by membrane manufacturer.
.4 Complete perimeter flashing details according to membrane manufacturer's details and specifications.
.5 Apply gravel ballast at a rate of [insert membrane manufacturer's recommended rate], as the membrane is installed and seams checked. For areas with high wind exposure, gravel requirements may vary. (Some grades of gravel may require a proprietary protection mat between the gravel and the ballast; consult membrane manufacturer's specifications for details.)
3.8 Fully-Adhered Membrane: (consult membrane manufacturer for substrate restrictions)

3.8.1 Solvent-Based Adhesive:

.1 Prime area receiving membrane with proprietary adhesive using a solvent resistant roller; allow to dry to the touch.
.2 Unroll the membrane; lap sheets [(50) mm (2")] for hand-welded seams and [(100) mm (4")] for machine-welded seams.
.3 Fold back one-third of membrane length and coat underside with adhesive; avoid adhesive in the seam area, clean with proprietary cleaner; allow adhesive to become tacky.
.4 Roll coated side of membrane on to primed substrate and press it solidly into position.
.5 Fold back the other two-thirds of the sheet and repeat procedure.
.6 Roll membrane solidly down into adhesive; use a weighted roller.
.7 Heat-weld seams according to Item 3.9 “Seams”.
.8 Install proprietary fastening bar around perimeter, penetrations, and where specified by membrane manufacturer.
.9 Complete membrane flashing details as recommended by membrane manufacturer's specification.

3.8.2 Dispersion-Based Adhesive: (specific temperature and application restrictions apply, consult membrane manufacturer).

.1 Apply [( ) L / meters squared] [( ) gal / square] adhesive to substrate surface using a paint roller or notched squeegee; follow membrane manufacturer's application and storage restriction in temperatures below +5°C (+40°F).
.2 Unroll membrane immediately into wet adhesive.
.3 Roll membrane using a weighted roller to ensure contact with substrate immediately after adhesion procedure.
.4 Avoid adhesive in lap areas; clean with water where required.
.5 Install proprietary fastening bar around perimeter, penetrations, and where specified by membrane manufacturer.
.6 Complete membrane flashing details as recommended by membrane manufacturer's specification.
3.9 Seams:
(Seaming requirements vary between manufacturers. Insert the specified membrane manufacturer's proprietary instructions.)
3.10 Membrane Flashings:
(Membrane flashing details vary and should be consulted. In all cases the manufacturer's details / requirements should be strictly followed. Perimeter fixation of thermoplastic sheet membranes required by RGC Guarantee Standards.)
.1 Extend membrane base flashing from minimum [( ) mm] [( )"] out onto roof [from toe of cant], to minimum [200 mm (8")] above completed roof assembly surface.
3.11 Protected or Modified Protected Membrane Roof Assembly:
.1 Loose lay CAN / ULC-S701-97 Type 4 extruded expanded polystyrene rigid insulation over completed membrane; butt boards tightly together.
.2 Install filter fabric over insulation in shingle fashion, in direction of slopes, lapping 300 mm (12").
.3 Install {[( ) kg / m²] [( ) lb / square} gravel ballast] [( ) x ( ) x ( ) mm thick pavers] over insulation. (The amount of ballast required varies according to insulation buoyancy (related to thickness) and wind uplift. Refer to insulation manufacturer's latest printed recommendations for gravel rates.)


TPO/PVC Roof Systems

Construction Details