EPDM Guide Specification

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EPDM Guide Specification

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


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 the “RGC Roofing System Record” upon completion of this contract. (Includes RoofStar Guarantee, copies of inspection reports, and Roof Maintenance Guide.)
.2 Submit required shop drawings to [membrane manufacturer's representative] for approval; (a layout is usually required for mechanically-fastened systems).
.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 manufacturer's 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 materials, other than membrane, between +16°C (+60°F) and +27°C (+80°F), or restore to temperature range prior to use.
.4 Avoid prolonged exposure of light and heat sensitive materials to sunlight.
.5 Store combustible materials away from heat and open flame.
.6 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.)
.7 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.
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], Phillips, [cadmium-plated], [19 mm, 25 mm] [3/4", 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) or [as recommended by membrane manufacturer].
.7 Separation Sheets: proprietary sheets approved by membrane manufacturer.
.8 Asphalt: (asphalt may be required for installation of a vapour retarder only 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 Insulation Overlay:
13 mm (1/2") Perlitic Retro-fit Board conforming to CAN / CGSB 51.10-92
.10 Filter Fabric: 100% woven polyolefin; proprietary alternatives approved by membrane / insulation manufacturer.
.11 Gravel Ballast: (for Protected Membrane and Modified Protected Membrane Roof Assemblies); clean, washed, round or crushed stone; gradations according to RGC Guarantee Standards.
.12 Membrane Fasteners: (proprietary type approved by membrane manufacturer).
.13 Termination Bars: (proprietary type approved by membrane manufacturer).
.14 Insulation Fasteners: [( ) mm] [( )"]; {screws and [plastic] [steel] stress plates} [RGC accepted nails (over wood decks only)].
.15 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
Nominal [1.2 mm (0.045")] [1.6 mm (0.060")] thick EPDM (ethylene propylene diene monomer) conforming to CGSB 37-GP-52M, Type [1, 2], Class [A, B].
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 reglets and nailing strips are in place.
.3 Ensure parapet substrates are suitable for adhering membrane flashing. (Membrane manufacturer's minimum requirements may vary from roof substrate; plywood is strongly recommended.)
.4 Do not install membrane in direct contact with surfaces contaminated with coal tar pitch or low melt asphalt (CSA A123.4-M1979, Type 1 or 2).
.5 Do not install membrane and accessories where they will be exposed to a constant temperature in excess of +80°C (+180°F).
.6 Ensure EPDM roof system does not come in contact with waste products (grease, oil, petroleum, solvents, vegetable or mineral oil, animal fats, etc.) or direct steam venting.
.7 Satisfy the membrane manufacturer's specifications for substrate preparation prior to membrane application.
.8 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 Vapour Retarder: The design authority determines the necessity for, and the placement of, the vapour retarder.
3.3 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 (asphalt may be required for installation of a vapour retarder or insulation and must not come in contact with membrane).
.4 Comply with membrane manufacturer's recommendations for loose-laid and ballasted 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.
.7 Install 13 mm (1/2") Perlitic Retro-fit Board as an insulation overlay, where required by membrane manufacturer for specified system.
3.4 Membrane
(Perimeter fixation of EPDM roof membranes is required by RoofStar Guarantee Standards. Consult membrane manufacturer for proprietary method).
.1 Start at high point of roof and work toward low point; lap upper sheets over subsequent sheets.
.2 Unroll and align membrane; lap sides [( ) mm] [( )"] and ends [( ) mm ] [( )"].
.3 Position membrane and allow to relax minimum thirty minutes.
.4 Carry membrane to [top of parapet /curb] [base of wall / curb].
.5 Ensure splicing and bonding surfaces are dry and clean.
3.4.6 Fully adhered:
.1 Fold membrane back evenly onto itself to expose half the underside; ensure sheet lays smooth without wrinkles or buckles.
.2 Clean mating membrane surface by wiping or brushing to remove excessive talc or contaminants.
.3 Apply bonding adhesive evenly without globs or puddles to both the sheet and substrate; use a proprietary paint roller. DO NOT APPLY TO SPLICE AREA.
.4 Allow bonding adhesive to dry until tacky but not sticky or stringy at the touch of a clean, dry finger.
.5 Roll coated half of sheet onto coated substrate slowly and evenly with no wrinkles; press membrane surface to substrate with a stiff push broom to ensure proper contact.
.6 Repeat procedure ( to for remaining half of membrane.
.7 Install adjoining sheet in the same manner; overlap edges a minimum of [( )mm] [( )"].
.8 Follow procedures outlined in 3.5 for seaming and 3.6 for flashing.
3.4.7 Loose-laid: (Loose-laid systems are used in conjunction with ballast or protected membrane system).
.1 Loose lay membrane over substrate; lap edges [( )mm] [( )"].
.2 Follow procedures outlined in 3.5 for seaming and 3.6 for flashing.
.3 Loose lay a [filter fabric] [proprietary protection mat] over membrane; (depending on the quality of the ballast, the membrane manufacturer may require a protection mat, consult manufacturer's specifications).
.4 Install river washed gravel at a minimum rate of [( ) kg / m²] [( )lb / sq ft]; (insert membrane manufacturer's minimum rate; ballast should be sufficient to counteract wind uplift).
.5 Alternatively install concrete pavers on proprietary pedestals as membrane ballast.
3.4.8 Mechanically fastened: (Mechanically-fastened systems for EPDM vary greatly, consult membrane manufacturer's specifications for their system requirements.)
3.5 Seams: (Membrane manufacturers' seaming requirements vary.)
.1 Position membranes to overlap minimum [( )mm] ( )"].
.2 Fold top sheet of splice area back 250 mm to 300 mm (10" to 12").
.3 Clean both top and bottom seam area with proprietary cleaner and clean cloth to remove talc, dirt, and other contaminants; allow to dry; (Membrane manufacturers are specific in the types of cleaners and rags that may be utilized).
.4 Stir splice adhesive thoroughly before and during use.
.5 Apply adhesive according to method and rate specified by manufacturer; (Methods of applying splice adhesives vary, each membrane manufacturer's method must be followed exactly. Some EPDM manufacturers also use a tape and / or a in-seam sealant in their seams.)
.6 Allow adhesive to dry until tacky but not sticky or stringy to the touch of a clean, dry finger.
.7 Roll the top sheet toward the lap area until the two surfaces meet; ensure no wrinkling or stretching occurs.
.8 Apply hand pressure along the entire seam to mate surface; roll entire seam using a [( ) mm] [( )"] steel roller according to manufacturer's specification.
.9 Wait [( ) hrs.] after completing the seam; clean seam area [( ) mm] [( )"] on each side of lap using membrane manufacturer's recommended method and proprietary cleaner.
.10 Apply a [( ) mm x ( ) mm] bead of lap sealant over lap edge; feather as recommended.
3.6 Membrane Flashings
(Membrane flashing details vary and should be consulted. In all cases the manufacturer's details / requirements should be strictly adhered to. Perimeter fixation of EPDM is required by RGC Guarantee Standards)
.1 Flash all membrane penetrations with proprietary flashing materials according to the manufacturer's latest recommended detail.
3.7 Protected or Modified Protected Membrane Roof Assembly:
.1 Loose lay CAN / ULC-S701-97 Type 4 extruded expanded polystyrene rigid insulation over completed membrane; but boards tightly together.
.2 Install filter fabric over insulation in shingle fashion, in direction of slopes, lapping 300 mm (12").
.3 Install {[( ) kg / meter squared] [( ) 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].

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