Tremco 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: TREMCO LTD.

Contact Address: See Membership List in Section 1.

Product Group: BUILT-UP RUBBERIZED BITUMINOUS ROOFING: THERM 100

Country of Origin: Canada, U.S.

Year First Installed:
U.S.: 1982
Canada: 1983

1 Description

THERM 100 is a built-up roofing system utilizing THERMastic, a proprietary elastomeric hot-melt adhesive and waterproofing compound for laminating fibreglass plies.

1.1 GENERAL

1. 1. SYSTEM DESCRIPTIONS
      1. Install four plies of THERMglass felt in full moppings of THERMastic:
         • Surface with flood coat and gravel (RGC Guarantee Standards) or granules (Tremco standard).
         • For protected membrane, surface with flood coat, then install polyethylene sheeting prior to installing extruded polystyrene insulation, woven polyolefin fabric and ballast.
      2. Range of Application: THERM 100 can be used where ever conventional built-up roofing is presently used.
   2. 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.
   3. SITE CONDITIONS
      1. Slope limitations as RGC Guarantee Standards:
         • Minimum recommended slope: 1:50 (1 / 4" in 12")
         • Backnail each felt on slopes over: 1:12 (1" in 12")
   4. STANDARDS AND APPROVALS
      1. ULC: Meets Class A requirements.
      2. Factory Mutual: meets I-90 wind uplift requirements.
   5. MANUFACTURER'S SERVICES
      1. Applicator Training: available.
      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. 1. BUILT-UP ROOF MEMBRANE
      1. Asphalt Glass Felt “THERMglass” conforming to ASTM standard 2178, Type IV.
      2. Elastomeric hot-melt adhesive and waterproofing tested according to:

         Softening Point - ASTM D36-86

         Penetration - ASTM D5-86

         Flash Point - ASTM D92-85

         Elongation - ASTM D2523-78

   2. ANCILLARY PRODUCTS
      1. Cutback primer: Tremprime Quick Dry
      2. Mastics: ELS

         Fibermat

         Polyroof

         Sheeting Bond

         Tremlastic

      3. Reinforcing membrane: Burmesh woven glass
      4. Flashing membrane - Tremco Elastomeric Sheeting or Tremco Polytherm
      5. Gravel: according to RGC Guarantee Standards

1.3 EXECUTION

1. 1. PREPARATION
      1. The deck must be properly designed and constructed to support and secure the THERM 100 built-up 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 RGC for the different deck types.
   2. 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 ribbons of THERMastic, hot asphalt or Tremco insulation adhesive.

           Install two plies of THERMglass or No.15 asphalt-saturated felt, fully adhering with moppings of hot THERMastic or hot asphalt.

   3. INSULATION
      1. Mechanically fasten insulation over nailable decks in accordance with RGC Guarantee Standards.
      2. Embed insulation in a 1.5 kg / m² (30 lb / square) mopping of hot THERMastic or hot asphalt over non-nailable decks.
      3. Install accepted insulation overlay board, as required by RGC Guarantee Standards.
      4. Install wood nailing strips on slopes exceeding 1:12 (1" in 12").
   4. MEMBRANE APPLICATION

      Install four plies of THERMglass, laid in shingle fashion and placed to ensure that water will flow over or parallel to, but never against, exposed edges.

      1. Heat THERMastic to application temperatures in accordance with label directions.
      2. At time and place of application, THERMastic shall be within 23°C to 260°C (450°F to 500°F).
      3. Use 229 mm (9"), 457 mm (18") and 659 mm (27") wide plies to start and finish roof membrane along roof edges and terminations.
      4. Embed each ply in solid moppings or continuous spreads of THERMastic at 1.2 L / m² (2.5 gal / square). Apply THERMastic no more than 3048 mm (10') ahead of each roll being embedded.
      5. Stagger all end laps.
      6. Fit plies into roof drain rims, reinforce with elastomeric sheeting or two plies of Polytherm and THERMastic, secure clamping collars and install domes.
      7. Extend plies only to top edges of cant strips along bases of parapets, walls and skylights.
   5. FLASHINGS ==
      1. Ensure continuity of air / vapour seal at all changes in direction.
      2. Install one ply of Tremco elastomeric sheeting in THERMastic or, alternatively, install two plies of Polytherm adhered and overcoated with THERMastic.
      3. Ensure that flashing membrane extends onto roof membrane a minimum of 150 mm (6") and terminates a minimum of 200 mm (8") above roof membrane on walls.
      4. Mechanically fasten flashing membrane 200 mm - 300 mm (8" - 12") on centre along outside fascia and along upper edge of wall flashing.
   6. PROTECTIVE FINISH ==
      1. Reflective Granular Surface:
         Apply THERMastic at 1.5 L / m² (3 gal / square) and promptly cover with No.11 roofing granules manufactured by 3M at 3 kg / m² (60 lb / square).
      2. Gravel Surface:
         Apply THERMasticat 2.2 L / m² (4.5 gal / square) and promptly cover with pea (roofing) gravel at 20 kg / m² (400 lb / square).
      3. Reflective Smooth Surface:
         Apply THERMastic at 1.5 L / m² (3 gal / square) and immediately install THERMglass felt. Avoid overlapping the THERMglass or, conversely, leaving gaps greater than 6 mm (1 / 4") between felts.

         Sweep the completed surface, removing all loose sand, dust, dirt, or other foreign material. Apply two coats of reflective coating at the rate of:

         • Double Duty Aluminum: .20 L / m² (.40 gal / square) per coat.
         • Double Duty White: .16 L / m² (.33 gal / square) per coat.

         Note: Reflective coatings may require maintenance or occasional recoating and this work is not covered by the RoofStar Guarantee.

      4. Protected Membrane Configuration:

         Apply THERMastic at 1.5 L / m² (3 gal / square). When THERMastic has cooled to ambient temperature, install polyethylene sheeting extruded polystyrene insulation boards, woven polyolefin fabric (i.e. Fabrene Scrim) and stone ballast at a minimum 49 kg / m² (1000 lb / square).

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2 Membrane Assemblies

2.1 Upgraded Built-up Roof (General)

Year First Installed: 1974

DESCRIPTION

The upgraded built-up roof is a low slope roofing system composed of five plies of No.15 organic felts or 4 plies of Type IV Fibreglass felts, adhered and glaze-coated with hot applications of asphalt. Flashings incorporate two plies of Polytherm adhered and overcoated with the appropriate adhesive. The application is completed with a specifically engineered Tremco top pour and gravelling.

1. PART 1 - GENERAL
   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. Upgraded Built-Up Roof:
         Install five plies of No.15 asphalt-saturated roofing felt or 4 plies of Type IV Fibreglass felts in full moppings of Type 2 or Type 3 asphalt. A glaze coat of hot asphalt is then applied to entire membrane. Surface with cold top pour and gravel to RGC Guarantee Standards.
      2. Range of Application:
         The upgraded built-up roof can be used where ever conventional built-up roofing is presently used.
   2. DELIVERY, STORAGE AND HANDLING
      1. Deliver and store materials in original packages and containers with manufacturers' seals and labels intact.
      2. Keep roofing materials dry; protect from adverse weather conditions.
      3. Store rolls on end.
   3. SITE CONDITIONS
      1. Slope Limitations:
         • Minimum recommended slope: 1:50 (1 / 4" in 12")
         • Backnail each felt on slopes over: 1:12 (1" in 12")
   4. STANDARDS AND APPROVALS
      1. ULC: Meets Class A requirements.
      2. Factory Mutual: Same as conventional built-up roof.
   5. MANUFACTURER'S SERVICES
      1. Applicator Training: available.
      2. Technical Service: representatives are available for design consultation and assistance.
      3. Specification / Drawings: provided on all applications.
2. PART 2 - PRODUCTS
   1. BUILT-UP ROOF MEMBRANE
      1. Asphalt-saturated and perforated No.15 Felt conforming to CSA A123-3-M1979.
      2. Type 2 or 3 asphalt bitumen conforming to CSA A123-4-M1979.
      3. Top pours:
         Cold applied top pour (ECOlastic) tested according to:

         Consistency - ASTM D2196-81

         Homogeneity - ASTM D2196-81

         Density - ASTM D1475-85

         Flash Point - ASTM D93-85

         Hot top pour (Thermastic 80) tested according to: ASTM D6152

   2. ANCILLARY PRODUCTS
      1. Cutback primer: Tremprime Q.D.
      2. Rubberized bituminous adhesive: THERMastic 80
      3. Mastics: ELS

         Fibermat

         Polyroof

         Sheeting Bond

         Tremmastic

      4. Base sheet: BURmastic composite ply (coated cold process felt)
      5. Reinforcing membrane: Burmesh woven glass
      6. Flashing membrane: Polytherm (spun-bonded polyester)
      7. Gravel: according to RGC Guarantee Standards
3. PART 3 - EXECUTION
   1. PREPARATION
      1. The deck must be properly designed and constructed to support and secure the upgraded built-up 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 and apply roofing membrane in accordance with good roofing practices as outlined by RGC for the different deck types.
   2. 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 depend upon specific job requirements:
         • Install Tremco vapour retarder with 50 mm (2") side laps and 100 mm (4") end laps, adhering with ribbons of THERMastic 80, hot asphalt or Tremco insulation adhesive.
         • Install two plies of No.15 asphalt saturated felt, fully adhering with moppings of hot asphalt.
   3. INSULATION
      1. Mechanically fasten insulation over nailable decks in accordance with RGC Guarantee Standards.
      2. Embed insulation in a 1.5 kg / m² (30 lb / square) mopping of hot asphalt over non-nailable decks.
      3. Install accepted insulation overlay board, as required by RGC Guarantee Standards.
      4. Install wood nailing strips on slopes exceeding 1:12 (1" in 12").
   4. MEMBRANE APPLICATION

      Install five plies of No.15 roofing felt or 4 plies of Type IV Fibreglass roofing felts, laid in shingle fashion. Place to ensure that water will flow over or parallel to, but never against, exposed edges.

      1. Heat bitumen to application temperature in accordance with label directions (eg. EVT).
      2. Use 203 mm (8"), 381 mm (15") and 559 mm (22") and 737 mm (29") wide plies to start and finish roof membrane along roof edges and terminations.
      3. Embed each ply in solid moppings or continuous spreads of roofing asphalt at a rate of 1 kg / m² (20 lb / square).
      4. Apply bitumen no more than 3048 mm (10' ) ahead of each roll being embedded.
      5. Stagger all end laps.
      6. Fit plies into roof drain rims, reinforce with two plies of Polytherm and THERMastic 80 or asphalt, secure clamping collars and install domes.
      7. Extend plies only to top edges of cant strips along base of parapets, walls and skylights. Nail plies to underlying wood cant strips.
      8. A glaze coat of roofing asphalt shall be applied to the completed membrane application at a rate of 1 kg / m² (20 lb / square) [Optional for THERMastic 80 top pour].
   5. FLASHINGS
      1. Ensure continuity of air / vapour seal at all changes in direction.
      2. Install two plies of Tremco Polytherm in THERMastic 80.
      3. Ensure that flashing membrane extends onto roof membrane a minimum of 150 mm (6") and terminates a minimum of 200 mm (8") above roof membrane in walls.
      4. Mechanically fasten flashing membrane 200 mm to 300 mm (8" to 12") on centre along outside fascia and along upper edge of wall flashing.
      5. Install metal counter flashing.
   6. TOP POURS
      1. Cold-applied top pour (ECOlastic):

         Apply cold top pour at a minimum rate of 2.5 L / m² (5 gal / square) or hot-applied top pour (THERMastic 80) at a minimum rate of 2.7 kg / m² (55 lb / 100 sq.ft).

      2. Clean, dry roofing gravel shall be evenly spread into the top pour at the minimum rate of 20 kg / m² (400 lb / square)

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2.2 Upgraded Built-up Roof: Un-insulated

ROOF ASSEMBLY
Components	Options	Comments or Cautions
Roof Deck	Wood / Plywood Concrete Steel	Prime surfaces to be adhered with hot bituminous material. Tape plywood joints if mopped with hot adhesive. Wood decks require a nailed separation sheet. Steel decks require a levelling underlay.
Underlay	Gypsum Plywood	Minimum 12.7 mm (1 / 2").
Asphalt	Asphalt	Mop asphalt at a rate of 1 kg / m2 (20 lbs / square) per ply.
BUILT-UP MEMBRANE
Base Sheet	BURmastic (cold process felt)	Mechanically fasten to wood decks.
Roof Membrane	No.15 asphalt-saturated roof felt	Install five plies No.15 felt adhered with full moppings of Type 2 or Type 3 asphalt at the rate of 1 to 1.2 kg / m2 (20 to 25 lb / square).
Flashings	Polytherm (polyester fabric)	Embed and overcoat two plies of Polytherm with THERMastic. Mechanically fasten flashing membranes on walls and over fascia details. Install metal counterflashing.
Glaze Coat	Type 2 or 3 asphalt	Apply moppings of Type 2 or 3 asphalt over entire membrane at a rate of 1 to 1.2 kg / m2 (20 to 25 lb / square).
Membrane Surfacing	Cold top pour of ECOLastic	Apply cold top pour at a rate of 2.5 L / m2 (5 gal/square). (ECOLastic is waterborne and should not be exposed to below freezing temperatures.)
	Gravel	Install according to RGC Guarantee Standards.

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2.3 Upgraded Built-up Roof: Insulated

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ROOF ASSEMBLY
Components	Options	Comments or Cautions
Roof Deck	Wood / Plywood Concrete Steel	Prime surfaces to be adhered with hot bituminous material. Tape plywood joints if mopped with hot adhesive. Wood decks require a nailed separation sheet. Steel decks require a levelling underlay.
Thermal Barrier	Tremco Vapour Retarder	Adhere with Tremco insulation adhesive or asphalt.
	2-Ply No.15 Felt	Mop with asphalt. (The requirement for a vapour retarder is determined by the design authority).
Insulation	Polyisocyanurate foam Extruded polystyrene Expanded polystyrene Glass fibreboard Wood fibreboard	Accepted overlay board (one or two layers) is required over heat sensitive and foamed insulations. Tape insulation joints where an overlay is not required.
Insulation Overlay	accepted overlay board	Where required, install according to RGC Guarantee Standards.
BUILT-UP MEMBRANE
Roof Membrane	No.15 asphalt-saturated roof felt	Install five plies of No.15 felt adhered with full moppings of Type 2 or Type 3 asphalt at the rate of 1 to 1.2 kg / m2 (20 to 25 lb / square).
Flashings	Polytherm (polyester fabric)	Embed and overcoat two plies of Polytherm with THERMastic. Mechanically fasten flashing membrane on walls and over fascia details. Install metal counterflashing.
Glaze Coat	Type 2 or 3 asphalt	Apply moppings of Type 2 or 3 asphalt over entire membrane at a rate of 1 to 1.2 kg / m2 (20 to 25 lb / square).
Membrane Surfacing	Cold top pour of ECOLastic	Apply cold top pour at a rate of 2.5 L / m2 (5 gal / square). (ECOLastic is waterborne and should not be exposed to below freezing temperatures.)
	Gravel	Install according to RoofStar Guarantee Standards.

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