SBS Guide Specification

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SBS Guide Specification

(READER: Edit and amend to suit required purpose)

SECTION 07535

PROJECT NO. (OPTIONAL)

PROJECT NAME (OPTIONAL)

[MODIFIED] [OXIDIZED] BITUMEN SHEET ROOFING

PAGE [ ] OF [ ]

1 PART 1 - GENERAL
    1. Work Included: (this clause is optional and, if using, ensure description of work is complete.)
    2. Related Work: (reference appropriate sections and ensure list is complete) eg:
      1. Section 06100 Rough Carpentry (Cants, Blocking, etc.)
      2. Section 07311 Asphalt Shingles
      3. Section 07600 Flashing and Sheet Metal
      4. Section 15440 Plumbing (Supply of Roof Drains)
    3. Quality Assurance:
      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.
      2. Qualification of Workers: Employ skilled applicators approved by membrane manufacturer.
      3. Independent Inspection: (Preferred Wording)
        1. Perform using an independent inspection company acceptable to RGC, [the owner, and the consultant] 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.
      4. Independent Inspection: (Optional Wording)
        1. Perform using an independent inspection company acceptable to RGC, [the owner, and the consultant] 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.
    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. List other submittal requests here, eg: shop drawings, samples, product literature, etc.
    5. Product Delivery, Storage, and Handling:
      1. Deliver and store materials in original containers with manufacturer's labels and seals intact.
      2. Store materials elevated from contact with ground and moisture and protected from weather.
      3. Store membrane rolls on end, one pallet high, selvage edge up; do not store in a leaning position.
      4. Where climatic conditions warrant, store membrane rolls in heated enclosures prior to use, as recommended by manufacturer; bring only enough rolls for immediate use to work area.
      5. Avoid prolonged exposure of light and heat sensitive materials to sunlight.
      6. Store combustible materials away from heat and open flame.
      7. Consult the manufacturer's material safety data sheets for materials on this project.
    6. Guarantee:
      1. Provide the standard Roofing Contractors Association of British Columbia (RGC) five (5) or ten (10) year Guarantee.
2 PART 2 - PRODUCTS
    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; materials to be 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] [3/4", 1"] long, to CSA B35.3-1962.
      6. Vapour Retarder: (the selection of, and the requirement for, the vapour retarder is determined by the design authority.) or [as recommended by membrane manufacturer]
      7. Base / Separation Sheets: proprietary sheets approved by membrane manufacturer.
      8. Asphalt: oxidized roofing asphalt conforming to [CSA A123.4-M1979, Type 3 (steep)] [ASTM D312-78, Type IV (special steep)].
      9. Insulation Overlay:
        • 11 mm (7/16") asphalt-impregnated fibreboard conforming to CAN / CSA- A247-M86, Type 1; [asphalt-coated one side] [asphalt-coated both sides]
        • 13 mm (1/2") Perlitic Retro-fit Board to CAN / CGSB 51.10-92 or
        • RGC accepted asphaltic overlay board
      10. Filter Fabric: 100% woven polyolefin; proprietary alternatives approved by membrane / insulation manufacturer.
      11. Gravel: (where pour coat and gravel surfacing options are approved by membrane manufacturer); clean, washed, round or crushed stone; opaque to ultraviolet light; gradations according to RGC Guarantee Standards.
      12. Gravel Ballast: (for Protected Membrane and Modified Protected Membrane Roof Assemblies); clean, washed, round or crushed stone; gradations according to RGC Guarantee Standards.
      13. Membrane Fasteners: (proprietary type approved by membrane manufacturer).
      14. Termination Bars: (proprietary type approved by membrane manufacturer).
      15. Insulation Fasteners: [( ) mm] [( )"]; {screws and [plastic] [steel] stress plates} [RGC accepted nails (over wood decks only)].
      16. Membrane Accessories: (List membrane manufacturer's proprietary accessories here. For Example: adhesives; sealants / mastics; prefabricated flashings; walkway pads; coatings, etc.)
    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 provide 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 [( )"]; [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 ( )].
    3. Roof Membrane:
      1. Base Sheet: minimum [ ] mm thick, {( )% [SBS][APP] modified} [oxidized] bituminous membrane; minimum [ ] kg / m² total weight with ( ) g / m² [non-woven] [woven] [polyester] [fibreglass] [and ( ) g / m² non-woven fibreglass] reinforcing; [sanded] [polypropylene] bottom surface and [sanded] [polypropylene] top surface; for [torched] [mopped] [adhesive] application; {conforming to CGSB 37-GP-56M 1985, Type [1,2] [a,b,c], Class C, Grade [1,2] }; [minimum tensile strength ( ) N/50 mm].
      2. Cap Sheet [Single Ply]: minimum [ ] mm thick, {( )% [SBS][APP] modified} [oxidized] bituminous membrane; minimum [ ] kg / m² total weight with [( ) g / m² [non-woven] [woven] [polyester] [fibreglass] [and ( ) g / m² fibreglass] reinforcing; [sanded] [polypropylene] bottom surface and [sanded] [polypropylene] [granular] [metal foil] top surface; for [torched] [mopped] [adhesive] application; {conforming to CGSB 37-GP-56M 1985, Type [1,2] [a,b,c], Class [A,B,C], Grade [1,2]}; [minimum tensile strength ( ) N/50 mm].
      3. Base & Cap Membrane Flashing: (Generally, the base and cap membrane flashing should, as a minimum, be the same weight and reinforcing as the roof membranes. Often manufacturers recommend higher mass sheets with more reinforcement, and in many cases torched application is required. Consult membrane manufacturer.)
3 PART 3 - EXECUTION
    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. Install a [mechanically fastened] base ply to membrane manufacturer's specification [over wood board deck] [where required].
      4. Satisfy the membrane manufacturer's specifications for substrate preparation prior to membrane application.
      5. A thermal barrier may be required between the roof deck and some insulations. Building code and insurance requirements to be identified by design authority.
    2. Primer:
      1. Prime wood, concrete, and metal surfaces to be directly adhered with bituminous membranes; allow to dry.
      2. Consult membrane manufacturer for specific requirements.
    3. Vapour Retarder:
      The design authority determines the necessity for and the placement of the vapour retarder.
    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.
      4. Install tapered insulation according to insulation manufacturer's shop drawings.
      5. Install only as much insulation as can be covered with roof membrane on the same day.
      6. Install wood nailing strips (insert where slopes exceed manufacturer's recommendation); ensure nailer is flush with insulation surface. (On uninsulated or PMR systems, wood nailers must be flush with deck and are the responsibility of others.)
      7. Install 11 mm (7/16") asphalt-impregnated fibreboard, 13 mm (1/2") Perlitic Retro-fit Board as an insulation overlay, or RGC accepted asphaltic overlay board, where required by RGC Guarantee Standards.
    5. Base Sheet: (two-ply membrane)
      1. Start at the low point and [at right angles] [parallel] to the slope. (Some specifications require the membrane be installed parallel to the slope for high slope applications, consult membrane manufacturer.)
      2. Unroll and align membrane; lap sides [( ) mm] [( )"] and ends [( ) mm ][( )"]; stagger end laps [( ) mm] [( )"].
      3. Carry base sheet to [top of cant] [base of wall / curb]. (Some manufacturers do not require cants and may specify that the base sheet not be bonded to the cant if present; consult membrane manufacturer.)
      4. Asphalt-adhered:
        1. Reroll approximately half the membrane into a firm roll.
        2. Embed membrane in [( ) kg / m²] [( ) lb / square] hot asphalt; minimum asphalt application temperature +205°C (+400°F) at the roll.
        3. Limit mopping distance to 1 m (3') ahead of unrolling membrane to ensure proper asphalt application temperature is maintained.
        4. Apply even pressure on membrane as it is unrolled; do not “kick the roll out”; a visible “wave” of asphalt must precede the roll.
        5. Reroll opposite end and repeat process.
        6. Mechanically fasten head laps. (Consult membrane manufacturer for specific recommendations on slopes over 1:24 (1/2" in 12") ).
      5. Torch-adhered: (modified membranes only)
        1. Reroll approximately half the membrane into a firm roll.
        2. Direct propane torch along underside of roll, melting the surface modified bitumen; preheat seam of previous roll concurrently.
        3. Unroll membrane as modified bitumen melts.
        4. Push first roll back after starting to check for full bonding of the membrane; adjust torching and speed accordingly; avoid stopping and starting which may cause voids or insufficient bonding.
        5. Bevel “T” joints at roll ends and repair “fishmouths” using a torch-heated trowel.
        6. Reroll opposite end and repeat process.
        7. Mechanically fasten head laps. (According to membrane manufacturer's recommendations.)
      6. Adhesive-applied: (This option is a special application and when offered as an alternative method the membrane manufacturer must approve the system and the application.)
        1. Install proprietary adhesive according to [insert membrane manufacturer] latest printed instruction.
        2. Special details may be required at perimeters and openings, consult membrane manufacturer.)
        3. Nail headlaps [( ) mm] [( )" o/c] [staggered].
        4. Lift overlaps and, using a proprietary torch, torch seal seams; take care not to ignite adhesive; ensure a full bond is achieved.
      7. Loose-laid and ballasted: (This option is a special application and where offered as an alternative method the membrane manufacturer must approve the system and the application.)
        1. Install membrane loosely over acceptable substrate; lap sides [( ) mm] [( )"] and ends [( ) mm] [( )"].
        2. Lift overlaps and, using a proprietary torch, torch seal seams; ensure a full bond is achieved.
    6. Cap Sheet: (two-ply membrane)
      1. Start at low point and in same direction as base sheet.
      2. Unroll and align membrane; stagger side laps and end laps minimum [( ) mm ( )"] from those in base sheet; cap sheet side laps [( ) mm] [( )"] and end laps [( ) mm] [( )"]; stagger end laps [( ) mm] [( )"].
      3. Carry cap sheet to [top of cant] [base of wall / curb]. (See notes on base sheet, Clause 3.5.3)
      4. Reroll approximately half the membrane into a firm roll.
      5. Install cap sheet [in hot asphalt as outlined for base sheet, clauses 3.5.4.1 to 3.5.4.6] [torch-adhered as outlined for base sheet, clauses 3.5.5.1 to 3.5.5.7]. (Some membrane manufacturers permit hot asphalt applied cap sheets with torched seams as an option.)
      6. Embed granules at end laps of torched cap sheets; use a torch to soften the bitumen and a heated trowel to push the granules into the bitumen; do not scrape granules away.
    7. Membrane Flashings:
      Base and cap membrane flashing details vary and should be consulted. For example, many membrane manufacturers require the base membrane flashing be installed prior to the roof membrane cap sheet, while some require both base and cap membrane flashing be applied after the roof membrane is complete. In all cases the manufacturer's details / requirements should be strictly adhered to.
      1. Base membrane flashing:
        1. Cut membrane in 1 m (39") wide, the roll width, by the length required to suit detail.
        2. 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. Stagger side laps in membrane base flashing [minimum ( ) mm ( )"] from side and end laps in roof membrane [base] [cap] sheet.
        4. Install membrane base flashing [in hot asphalt] [torch-adhered] and mechanically fasten according to membrane manufacturer's detail. (In most cases, torch-adhered flashing is preferred, consult membrane manufacturer.)
        5. Bevel torched membrane base flashing edges and seams with a torch-heated trowel.
      2. Cap membrane flashing:
        1. Cut membrane in 1 m (39") wide, the roll width, by the length required to suit detail.
        2. Extend membrane cap flashing from minimum [( ) mm] [( )"] out onto roof [from toe of cant], to minimum [200 m] [8"] above completed roof assembly surface. (Membrane manufacturer may require the membrane cap flashing carried to outside of wall / detail or inside of curbs / openings and then mechanically fastened.)
        3. Stagger side laps in membrane cap flashing [( ) mm] [( )"] from side laps of membrane base flashing and from side and end laps of roof membrane cap sheet.
        4. Install membrane cap flashing [in hot asphalt] [torch-adhered and mechanically-fastened] according to membrane manufacturer's details. (Torch-adhered usually preferred, consult membrane manufacturer.)
        5. Press firmly into place using a damp cloth; remove air pockets.
    8. Single-Ply Membrane:
      Single-ply systems are offered by some SBS and APP modified membrane manufacturers. Consult membrane manufacturer and RGC Guarantee Standards for detailed installation instructions.
    9. Gravel Surfacing:
      Pour coat and gravel surfacing may be an alternative to mineral surfaced cap sheets, consult membrane manufacturer.
      1. Embed 20 kg / meter squared (400 lb / square) gravel into a single pour of 3.0 kg / meter squared (60 lb / square) hot asphalt; ensure gravel completely covers asphalt.
    10. 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 / 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.)




SBS Modified Bitumen Membrane Systems

SBS Construction Details