GAF BUR Installation Guidelines

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GAF BUR Installation Guidelines

Notice to the Reader:

The instructions provided below are reprinted from the manufacturer's own materials which were submitted to the RoofStar Guarantee Program for inclusion in this Manual. The reader is urged to check these against current publications issued by the manufacturer, to ensure accuracy.

Manufacturer: GAF

Contact Address: See Membership List in Section 1.

Product Group: BUILT-UP ROOFING SYSTEMS EXPOSED MEMBRANES, INSULATED

Country of Origin: U.S.A.

Country of Manufacture: U.S.A.

Year First Installed:
B.C.: 2002
Canada: 2002

1 Description

GAF’s BUR membranes consist of a fiberglass mat impregnated on both sides with asphalt. The non-woven glass mat used in GAF’s membranes provides excellent tensile strength. The GAF membranes are fully adhered with hot asphalt to prepared surfaces.

For application guidelines pertaining to GAF SBS membranes, see the GAF SBS Membrane Installation Guidelines elsewhere in this Manual.

1.1 GENERAL

  1. The roofing assembly / material information published in the RCABC Roofing Practices Manual does NOT represent a complete set of the manufacturer’s published data, nor does it represent a detailed specification. The preparation of a detailed specification is the responsibility of the design authority.
    1. SYSTEM DESCRIPTION
      1. Mop applied roofing membrane consisting of a base sheet and a cap sheet, separately applied in full, uniform moppings of hot steep roofing asphalt; apply to any prepared roof substrate or roofing insulation suitable for hot applied roofing asphalt, or to a mechanically attached base sheet.
      2. Range of application: new construction or reroofing; flat to vertical (consult GAF for specific slope requirements)
    2. DELIVERY, STORAGE, AND HANDLING
      1. Store GAF roofing membranes in a dry place and stacked on end to prevent damage to the selvage edge.
      2. Store rolls on a pallet, securely covered to prevent contact with moisture.
      3. When ambient temperatures are below 0°C (32°F): keep rolls in a heated area; install quickly without allowing to become cold; do not drop rolls when cold.
    3. SITE CONDITIONS
      1. Slope limitations:
        Minimum recommended slope: 1:50 (¼" in 12")
        Mechanical fastening required over: 1:16 (¾" in 12")
        Consult GAF for slopes over: 1:4 (3" in 12")
      2. Application temperature:
        Minimum ambient temperature: +4°C (+40°F)
        Maximum ambient temperature: +38°C (+100°F)
      3. Chemical incompatibilities: generally those that affect roofing asphalt
    4. STANDARDS AND APPROVALS (consult GAF for specific membranes or assemblies)
      1. Underwriters Laboratories: Class A, B and C Flame Resistance, "Roofing Materials and Systems Directory", 2001 Edition.
      2. Factory Mutual: Class 1 and Class I-90 (consult Factory Mutual Research Approval Guide for additional assemblies and uplift ratings)
      3. Canadian General Standards Board: CGSB 37-GB-56M
      4. Other: Metro-Dade, SWL, SBCCI, CIBC, CABO
      5. Underwriters Laboratories of Canada - Standard CAN / ULC-S107
    5. MANUFACTURER’S SERVICES
      1. Local GAF Commercial Specialists
      2. Specifications and drawings available from application and specification manual
      3. Seminars: Conducted as scheduled or upon request.
      4. Contractor Services Department available for technical questions and documentation.

1.2 MATERIALS

NOTE: Regardless of the materials listed below or anywhere else in these manufacturer's guidelines, only materials accepted for use in the RoofStar Guarantee Program, or accessories associated with those materials, may be used to qualify for a RoofStar Guarantee. To see a list of the manufacturer's products accepted for use in the RoofStar Guarantee Program, click on the link above.
    1. ROOFING MEMBRANES
      PRODUCTS
      DESCRIPTION
      Gafglas® #75 Base Sheet
      Hot mop applied base sheet conforming to ASTM D-4601, Type II.
      Gafglas® #80 Ultima Base Sheet
      Hot mop applied base sheet conforming to ASTM D-4601, Type II.
      Gafglas® Stratavent® Eliminator™
      Mechanically attached base sheet conforming to Nailable Base Sheet ASTM D-4897, Type II and ASTM D-3672, Type II.
      Gafglas® Stratavent® Eliminator™
      Hot mop applied base sheet conforming to ASTM D-Type II Perforated Base Sheet 4897, and ASTM D-3672, Type II.
      Gafglas® Mineral Surfaced Cap Sheet
      Hot mop applied cap sheet conforming to ASTM D-3909.
      Ruberoid® Energycap SBS 30 FR
      Hot mop applied cap sheet conforming to ASTM D-3909
    2. FLASHING MEMBRANES
      PRODUCTS
      DESCRIPTION
      Ruberoid® Mop (Smooth)
      Hot mop or cold adhesive applied, smooth surface; both side, membrane, for use as flashing.
      Ruberoid® Mop (Granule)
      Hot mop or cold adhesive applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® Mop 170FR (Granule)
      Hot mop or cold adhesive applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® Mop Plus (Granule)
      Hot mop or cold adhesive applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® Mop FR (Granule)
      Hot mop or cold adhesive applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® 20 (Smooth)
      Hot mop or cold adhesive applied, smooth surface; both sides, membrane, for use as flashing.
      Ruberoid® 30 (Granule)
      Hot mop or cold adhesive applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® 30FR (Granule)
      Hot mop or cold adhesive applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® Modified Base Sheet (Smooth)
      Hot mop or cold adhesive applied, smooth surface; both sides, membrane, for use as flashing.
      Ruberoid® SBS Heat-Weld™ 25 (Smooth)
      Torch applied, smooth surface; both sides, membrane, for use as flashing.
      Ruberoid® SBS Heat-Weld™ (Smooth)
      Torch applied, smooth surface; both sides, membrane, for use as flashing.
      Ruberoid® SBS Heat-Weld™ (Granule)
      Torch applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® SBS Heat-Weld™ 170FR (Granule)
      Torch applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® SBS Heat-Weld™ Plus (Granule)
      Torch applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
      Ruberoid® SBS Heat-Weld™ Plus FR (Granule)
      Torch applied, smooth bottom and mineral surfaced top membrane, for use as flashing.
    3. ACCESSORIES
      Mweld® Standard M Vent
      Pre-Flashed spun aluminum roof vent
      Mweld® Adjustable M Vent
      Pre-flashed two piece unit consisting of a spun aluminum base and a flexible EPDM upper boot
      Mweld® One Way M Vent
      Pre-Flashed spun aluminum one way roof vent
      Mweld® M Drain
      Pre-flashed spun aluminum or copper roof drain with gravel guard, strainer cap and waterproofing plumbing seal attached.
      Mweld® Pre-Flashed Lead Jack
      Pre-flashed plumbing vent (lead jack)
      Mweld® M Scupper
      Pre-flashed 24 ga. Galvanized steel through-wall roof drain. Also available upon request, made from aluminum, copper, or stainless steel.
      Mweld® M-Curb System
      A structural urethane outer shell curb with a pourable urethane sealant that is used in place of conventional metal pitch pans.
    4. ANCILLARY PRODUCTS
      The selection or omission of roof insulations, vapor retarder, expansion / control joints, etc. are design matters which remain the responsibility of the architect, engineer, or owner and are in no way the responsibility of GAF.
      1. Insulation: the following are approved for use with the specified membrane
        Polyisocyanurate CAN / CGSB-51.26-M86
        Perlite: ASTM C-728
      2. Primer: Matrix™ 307 Asphalt Primer conforming to CGSB 37-GP-9Ma
      3. Adhesives:
        Matrix™ 101 System Pro SBS Adhesive
        Matrix™ 102 Select SBS Adhesive
        Matrix™ 103 Standard Cold Lap Adhesive
        Matrix™ 105 System Pro SBS Sure Grip Adhesive
        Matrix™ 201 System Pro SBS Cement
        Matrix™ 202 Select SBS Flashing Cement
        Matrix™ 203 Standard Plastic Roof Cement
        Matrix™ 204 Standard Wet / Dry Roof Cement
        Matrix™ 205 System Pro SBS Sure Grip Flashing Cement
      4. Mechanical Fasteners: Drill Tec™ fasteners
      5. Gravel Ballast: conforming to ASTM D-1863-80; commercial grade, clean, dry, 6mm to 19mm (¼" to ¾") in size, opaque to ultra violet light, crushed rock, gravel or stone.
      6. Roofing asphalt conforming to CSA A123.4-M, Type 3 for slopes up to 1:16 (¾" in 12"); conform to ASTM D-312, Type IV for slopes 1:16 (¾" in 12") to 1:4 (3" in 12").
      7. Cants: Asphalt impregnated perlite, fiberboard, or wood.

1.3 EXECUTION

    1. PREPARATION
      1. Ensure surfaces are clean, smooth, dry, and free of depressions or sharp projections.
      2. Ensure that roof projections are firmly affixed and cant strips, reglets, and nailing strips are in place; CANT STRIPS ARE REQUIRED where two surfaces meet at a 90° angle.
      3. The design and construction of roof decks and proper drainage is the responsibility of the architect / specifier.
    2. PRIMER
      1. Prime all concrete, masonry, and metal surfaces to be directly bonded with bituminous membranes.
    3. INSULATION
      1. Mechanically fasten insulation over nailable decks and steel decks in accordance with RGC Guarantee Standards.
      2. Embed insulation in a full, uniform mopping of hot steep roofing asphalt at a rate of 1.5 kg / m2 (30 pounds per 100 square feet) over structural concrete decks.
      3. Install 11mm (½") asphalt impregnated fiberboard or perlite as insulation overlay where required by RGC Guarantee Standards.
      4. Install wood nailers at the perimeter of non-nailable decks and on slopes of 1:16 (¾" in 12") or greater.
    4. BASE SHEET (where required)
      1. Start at the low point of the roof and perpendicular to the slope.
      2. Mechanically fasten base sheet to the deck in accordance with GAF application and specification requirements.
      3. Asphalt adhered: embed base sheet to suitable substrate in a full, uniform mopping of hot steep roofing asphalt at a rate of 1.2 kg / m2 (25 lb per 100 ft2).
    5. PLY SHEET (S)
      1. Start at the low point of the roof and perpendicular to the slope.
      2. Unroll 1.2m to 2.0m (4’ to 6’) and align membrane.
      3. Asphalt adhered: embed ply sheets to suitable substrate in a full, uniform mopping of hot steep roofing asphalt at a rate of 1.2 kg / m2 (25 lb per 100 ft2).
      4. Lap ends 150 mm (6"); staggering end laps a minimum of 450 mm (18").
      5. Maintain approximately 10 mm (3 / 8") flow out of bitumen at overlapping seams.
      6. Broom plies to ensure complete bond.
      7. Carry membrane to the top of the cant. DO NOT BOND TO THE CANT.
      8. For slopes exceeding 1:16 (¾" in 12"), install membranes vertical to the slope and mechanically fasten in the head laps.
    6. MINERAL SURFACED CAP SHEET (where required)
      1. Start at the low point of the roof and perpendicular to the slope.
      2. Unroll 1.2m to 2.0m (4’ to 6’) and align membrane.
      3. Asphalt adhered: embed ply sheet(s) to suitable substrate in a full, uniform mopping of hot steep roofing asphalt at a rate of 1.2 kg / m2 (25 lb per 100 ft2).
      4. Lap sides 75 mm (3") and ends 150 mm (6"); staggering end laps a minimum of 450 mm (18").
      5. Maintain approximately 10 mm (3 / 8") flow out of bitumen at overlapping seams.
      6. Roll seam to ensure complete bond.
      7. Carry membrane to the top of the cant. DO NOT BOND TO THE CANT.
      8. For slopes exceeding 1:16 (¾" in 12"), install membranes vertical to the slope and mechanically fasten in the head laps.
    7. SURFACING (where required)
      1. Gravel: Not less than 19.5 kg / m2 (400 lb per 100 ft2) applied in a flood coat of 2.9 kg / m2 (60 lb per 100 ft2) of hot asphalt.
      2. Slag: Not less than 14.6 kg / m2 (300 lb per 100 ft2) applied in a flood coat of 2.9 kg / m2 (60 lb per 100 ft2) of hot asphalt.
    8. BASE FLASHING
      1. Asphalt adhered: embed ply sheet(s) to suitable substrate in a full, uniform mopping of hot steep roofing asphalt at a rate of 1.2 kg / m2 (25 lb per 100 ft2).
      2. Adhesive adhered: embed membrane to suitable substrate in a full, uniform layer of modified bitumen adhesive applied at a rate of 0.8 L / m2 (1.5 gal per 100 ft2).
      3. Torch adhered (SBS Heat-Weld membranes only): torch apply to suitable substrate with propane torch, directing the flame to the exposed surface of the roll as well as to the substrate or membrane underneath.
      4. Lap sides a minimum of 75mm (3").
      5. Ensure a bitumen flow out of approximately 10mm (3 / 8").
      6. Consult GAF application and specification manual for specific flashing substrate requirements or additional flashing details.

2 Membrane Assemblies

2.1 Exposed Membrane: Un-insulated

Slope Limitation: 1:4 (3" in 12") Consult membrane manufacturer for installation at higher slopes

In-Service Performance Min.: -10°C (+14°F)

Temperature of the Membrane
Min.: -18°C (+0°F)
Min.:<-18°C (+0°F)
Min.: +50°C (+122°F)
NOTE: Only components or products listed here and in the RGC Accepted Materials List may be used. No substitutes are allowed for guarantee purposes.
ROOF ASSEMBLY
Components Options Comments or Cautions
Roof Deck
  • Wood / plywood
  • Concrete
  • Steel
 Wood decks require a separation layer / base sheet. Prime concrete surfaces to be directly adhered with bituminous materials. Steel decks require overlay board sufficient to span the flutes.
Separation Sheet
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
 Mechanically fasten over wood and nailable decks.
Asphalt *Type III Type III permitted on slopes up 1 to 1:24 (½" in 12")
*Type IV Type IV required on slopes over 1:24 (½" in 12")
Base Sheet
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
  • Stratavent® Eliminator™ Perforated
 Asphalt applied, single ply membranes, overprepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Ply Sheet
  • Gafglas® Ply IV
  • Gafglas® FlexPly™ VI
 Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Cap Sheet (where required)
  • Gafglas® Ply IV
  • Gafglas® FlexPly™ VI
  • Ruberoid® Energycap SBS 30 FR
 Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Surfacing (where required)
  • Gravel
 Smooth surfaced cap sheet requires pour coat and
Flashing Membrane
  • Ruberoid® Mop Granule
  • Ruberoid® Mop 170 FR
  • Ruberoid® Mop Plus
  • Ruberoid® Mop FR
  • Ruberoid® 30
  • Ruberoid® 30 FR
  • Ruberoid® SBS Heat-Weld™ Granule
  • Ruberoid® SBS Heat-Weld™ 170 FR
  • Ruberoid® SBS Heat-Weld™ Plus
  • Ruberoid® SBS Heat-Weld™ Plus FR
 Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically separation sheet on steel or wood decks.
Torch applied (SBS Heat-Weld membranes only), single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.

2.2 Exposed Membrane: Insulated

Slope Limitation: 1:4 (3" in 12") Consult membrane manufacturer for installation at higher slopes

In-Service Performance Min.: -10°C (+14°F)

Temperature of the Membrane
Min.: -18°C (+0°F)
Min.: <-18°C (+0°F)
Min.: +50°C (+122°F)
Note: Only components or products listed here and in the RGC Accepted Materials List may be used. No substitutes are allowed for guarantee purposes.
ROOF ASSEMBLY
Components Options Comments or Cautions
Roof Deck
  • Wood / plywood
  • Concrete
  • Steel
 Wood decks require a separation layer / base sheet. Prime concrete surfaces to be directly adhered with bituminous materials. Steel decks require overlay board sufficient to span the flutes.
Separation Sheet
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
 Mechanically fasten over wood and nailable decks.
Asphalt
  • Type III
  • Type IV
 Type III permitted on slopes up 1 to 1:24 (½" in 12")
Type IV required on slopes over 1:24 (½" in 12")
Base Sheet
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
  • Stratavent® Eliminator™ Perforated
 Asphalt applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Ply Sheet
  • Gafglas® Ply IV
  • Gafglas® FlexPly™ VI
 Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Cap Sheet (where required)
  • Gafglas® Ply IV
  • Gafglas® FlexPly™ VI
  • Ruberoid® Energycap SBS 30 FR
 Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Surfacing (where required)
  • Gravel
 Smooth surfaced cap sheet requires pour coat and gravel.
Flashing Membrane
  • Ruberoid® Mop Granule
  • Ruberoid® Mop 170 FR
  • Ruberoid® Mop Plus
  • Ruberoid® Mop FR
  • Ruberoid® 30
  • Ruberoid® 30 FR
  • Ruberoid® SBS Heat-Weld™ Granule
  • Ruberoid® SBS Heat-Weld™ 170 FR
  • Ruberoid® SBS Heat-Weld™ Plus
  • Ruberoid® SBS Heat-Weld™ Plus FR

Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically separation sheet on steel or wood decks.Torch applied (SBS Heat-Weld membranes only), single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.

2.3 Protected and Modified Protected Membrane Assemblies

Slope Limitation: 1:4 (3" in 12") Consult membrane manufacturer for installation at higher slopes

In-Service Performance Min.: -10°C (+14°F)

Temperature of the Membrane
Min.: -18°C (+0°F)
Min.: <-18°C (+0°F)
Min.: +50°C (+122°F)

Note: Only components or products listed here and in the RGC Accepted Materials List may be used. No substitutes are allowed for guarantee purposes.


ROOF ASSEMBLY
Components Options Comments or Cautions
Roof Deck
  • Wood / plywood
  • Concrete
  • Steel
 Wood surfaces require a separation layer / base sheet. Prime concrete surfaces to be directly adhered with bituminous materials. Steel decks require overlay board sufficient to span the flutes.
Separation Sheet
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
 Mechanically fasten over wood decks.
Vapor Retarder Requirement and placement determined by the design authority
Insulation
  • Polyisocyanurate
  • Perlite
  • High Density Fiberboard
 Under membrane in MPMR. A fiberboard or overlay is required over heat sensitive foam insulations. A mechanically fastened base sheet may be required for torched membranes.
Insulation Overlay
  • Perlite
  • High Density Fiberboard
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
 Where required, install according to RGC Guarantee Standards.
Asphalt
  • Type III
 Type III permitted on slopes up to 1:24 (½" in 12")
  • Type IV
 Type IV required on slopes over 1:24 (½" in 12")
Base Sheet
  • Gafglas® #75
  • Gafglas® #80 Ultima™
  • Stratavent® Eliminator™ Nailable
  • Stratavent® Eliminator™ Perforated
 Asphalt applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Ply Sheet
  • Gafglas® Ply IV
  • Gafglas® FlexPly™ VI
Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Cap Sheet (where required)
  • Gafglas® Ply IV
  • Gafglas® FlexPly™ VI
 Asphalt or adhesive applied, single ply membranes, over prepared substrate or over mechanically fastened separation sheet on steel or wood decks.
Filter Fabric
  • 1 g / m2 (3 oz / yd2) black polyester or polypropylene
 Loose laid
Ballast
  • Gravel
  • Pavers
 In accordance with GAF application and specification requirements. Must comply with ASTM D-1863.
Where pavers are to be used, they must be a minimum of 61 cm x 61 cm (2' x 2'). For a 1.22 m (4') perimeter of the roof, pavers must weight a minimum of 1 kg / m2 (20 lb / ft2) and as determined by the building owner or its consultant.


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