Tremco SBS Membrane 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: Tremco Canada

Contact Address: See Membership List in Section 1

Product Group: COLD PROCESS MODIFIED BITUMEN ROOFING BURM 360 (Gravel Surfacing)

Country of Origin: Canada

Year First Installed

Canada: 1992

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1 Description

BURM 360 is a modified bitumen roof system consisting of two smooth surfaces, polyester reinforced SBS modified bitumen plies adhered and floodcoated with Burmastic adhesive. The system is then finished with a gravel surface.

1.1 GENERAL

The roofing assembly / material information published in the RoofStar 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.

SYSTEM DESCRIPTIONS

1. Install two plies of generic (180 gm) polyester reinforced modified bitumen plies embedding each ply in uniform applications of Burmastic adhesive:
   • Surface with flood coat and gravel RoofStar Guarantee Standards.
2. Range of Application: BURM 360 can be used wherever conventional built-up roofing is presently used.

DELIVERY, STORAGE AND HANDLING

1. Deliver and store materials in original packages and containers with manufacturers' seals and label intact.
2. Keep roofing materials dry; protect from adverse weather conditions.
3. Store rolls on end.

SITE CONDITIONS

1. Slope limitations as RoofStar Guarantee Standards:
   • Minimum recommended slope: 1:5 (1/4" in 12")
   • Backnail each felt on slopes over: 1:6 (2" in 12")

STANDARDS AND APPROVALS

1. UL: Meets Class A requirements.
2. FM: meets FM 1-90 wind uplift requirements (NOTE: the ;;;CSA A123.21 test method now applies - consult the list of approved products and assemblies).

MANUFACTURER'S SERVICES

1. Applicator Training
2. Technical Service: representatives are available for design consultation and assistance.
3. Specification / Drawings: provided on all applications

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.

1.3 EXECUTION

PREPARATION

1. The deck must be properly designed and constructed to support and secure the BURM 360 roof system.
2. The surface to which the roofing system is to be installed must be smooth, clean and dry.
3. Ensure wood blocking, curbs and cant strips are solidly secured and reglets and nailing strips are in place as required.
4. Prepare substrate in accordance with good roofing practices as outlined by RoofStar Guarantee Standards for the different deck types.

VAPOUR RETARDER

1. Vapour retarders must be continuously extended throughout the roof plane. All openings in the roof deck must be flashed at the retarder level.
2. Options dependent upon specific job requirement:
   • Install Tremco vapour retarder with 50 mm (2") side laps and 100 mm (4") end laps, adhering with Tremco Insulation Adhesive or Fas’N’Free Adhesive.

INSULATION

1. Mechanically fasten insulation over nailable decks in accordance with RoofStar Guarantee Standards.
2. Embed insulation in a ribbon application of Tremco Insulation adhesive at the rate of 0.019 litres per square metre (0.66 gallons / 100 sq ft) or Fas’N’Free Adhesive at the rate of 0.043 litres per square metre (1.5 gallons / 100 sq ft) over non-nailable decks.
3. Install 11 mm (7/16") asphalt coated fibreboard as insulation overlay, as required by RoofStar Guarantee Standards.
4. Install wood nailing strips on slopes exceeding 2:12 (2" in 12").

MEMBRANE APPLICATION

1. Install two plies of smooth (180 gram / sqm) polyester reinforced modified bitumen, laid in shingle fashion and placed to ensure that water will flow over or parallel to, but never against, exposed edges.
2. Prior to placement cut modified bitumen in 5 to 6 metre (16’ to 20’) lengths. Allow lengths to relax at least 30 minutes at 13°C (55°F) or above. Allow approximately 60 minutes to relax at temperatures below 13°C (55°F).
3. Starting at the low point of the roof, install two plies of smooth modified bitumen. Lap ends 150 mm (6").
4. Stagger all laps 300 mm (12").
5. Dry roll each ply to ensure proper alignment, prior to adhering with Burmastic
6. Immediately embed each ply in uniform applications of Burmastic, spray or brush applied at 0.8 litres per sqm (2 gallons / 100 sq.ft) per ply.
7. Fit plies into roof drain rims, reinforce with elastomeric sheeting adhered with Sheeting Bond.
8. Extend plies only to top edges of cant strips along bases of parapets, walls and skylights.

FLASHINGS

1. Ensure continuity of air / vapour seal at all changes in direction.
2. Install one ply of Tremco Elastomeric Sheeting in Sheeting Bond Adhesive or alternatively, install 2 plies of modified bitumen adhered in Brush Grade Mastic Adhesive, S.F. Polyroof, Ecomastic or Sheeting Bond.
3. Ensure that flashing extends onto roof membrane a minimum of 150 mm (6") and terminates a minimum of 200 mm (8") above roof membrane.
4. Mechanically fasten flashing membrane 200 - 300 mm (8" - 12") on centre along outside fascia and along upper edge of wall flashing.
5. Install metal counterflashing or apply One-Coat Aluminium as a protective reflective coating at the rate of 0.8 litres / sqm (2 gallons / 100 sq ft).

PROTECTIVE FINISH

1. Gravel Surface:
   • Apply Burmastic at 2.4 litres / sqm (6 gallons / 100 sq ft) and immediately broadcast 20 kg / sqm (400 lb / 100 sq.ft) of new, clean pea gravel.

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2 Membrane Assemblies

Consult the membrane manufacturer for detailed assembly notes applicable to different assembly types.

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