Henry Company 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: Henry Company Canada

Contact Address: See Membership List in Section 1.

Product Group: SBS MODIFIED BITUMINOUS MEMBRANES

Country of Origin: Germany

Country of Manufacture: Canada

Year First Installed

B.C.: 1985

Canada: 1985

Foreign: 1971

1 Description

The main components of the roofing and waterproofing systems are bitumen modified with SBS (Styrene Butadiene Styrene) and either fibreglass or polyester reinforcement.

The system normally consists of two plies of membrane. The membrane is produced in 1 m (39") wide rolls and varies in thickness from 2 mm (0.08") to 5 mm (0.2") depending on use and reinforcement.

The membrane is constructed by coating either a fibreglass or polyester fabric, on both the top and bottom, with high performance modified bitumen. The lower surface is either sanded or receives a poly surface while the top surface is covered with granules or sand.

The system is constructed in the field by either mopping with hot asphalt, torch welding, self-adhering, mechanically fastening or cold applied adhesive. In protected membrane roofing, granule-surfaced cap sheets are normally required on flashings only, with sanded surface cap sheets on field of roof.

PART 1 - GENERAL

The roofing assembly / material information published in the RGC 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.

1.1 RANGE OF APPLICATION:

.1 For use over all types of roof decks in residential, commercial, industrial and institutional applications wherever single ply or built-up roofing is presently used.

.2 For use in “conventional” applications, fully-adhered, spot adhered or mechanically fastened on non-insulated or insulated roofs.

.3 For use in “protected membrane” applications under insulation.

1.2 DELIVERY, STORAGE, AND HANDLING

.1 Deliver and store materials undamaged in original packaging.

.2 Store rolls upright and protected from moisture; protect stored materials from elements.

.3 Condition membrane rolls prior to cold weather application, temperatures +4°C (+40°F) and colder.

1.3 SITE CONDITIONS

.1 Chemical limitations: membranes are not resistant to oils or most petroleum solvents; chemical compatibility chart available upon request.

.2 Slope Range: From dead level (except single ply) up to and including vertical. The choice of membrane combinations and their application method is governed by deck type, insulation and fastening capability, perceived stress and required finish. Please consult Baker Inc. for recommendations.

.3 Slope Limitations:

Recommended Slope 1.100 (1/8" in 12)

Mechanically Fasten over 1.12 (1" in 12)

1.4 STANDARDS AND APPROVALS (for specific membranes or assemblies consult manufacturer)

.1 Canadian General Standards Board: conforms to CGSB 37-GP-56M; tested at Ontario Research Facility from 1986 to 1988.

.2 Underwriters Laboratories: testing underway.

.3 Underwriters Laboratories of Canada: testing complete (Guide No. 360 018).

.4 Canadian Mortgage and Housing: Evaluation Report No. 11297.

.5 Factory Mutual: Testing underway

1.5 MANUFACTURER'S SERVICES

.1 Applicator Training, Field Technician assistance, specification and design assistance is available upon request.

1.6 EQUIPMENT

.1 Torches: Use only torches designed for torching roofing materials.

.2 Spray Equipment: Use only adhesive spray equipment as recommended by Monsey Baker Inc.

1.1 MATERIALS

1.2 EXECUTION

PART 3 - EXECUTION

3.1 PREPARATION

.1 Ensure deck surfaces and substrates are acceptable for installation of the system and in accordance with RGC standards.

3.2 PRIMER

.1 Apply primer to all wood, concrete, gypsum, and metal surfaces directly receiving membrane. In some applications, primer is not recommended over gypsum type surfaces, contact Henry Company Canada representative for details.

3.3 VAPOUR RETARDER

.1 The selection and requirement for a vapour retarder is the responsibility of the design authority.

3.4 INSULATION

.1 Mechanically fasten insulation over nailable decks, in accordance with RGC Guarantee Standards.

.2 Embed insulation in a 1.5 kg / meter squared (30 lb / square) mopping of hot asphalt over non-nailable deck.

.3 Install 11 mm (7/16") asphalt-impregnated fibreboard, perlite or asphalt composite recover board as an insulation overlay where required by RGC Guarantee Standards.

.4 Install wood nailing strips on slopes exceeding 1:12 (1" in 12")

3.5 ROOF MEMBRANE APPLICATION

3.5.1 GENERAL

.1 Mop Application: Ensure mopping asphalt is heated to provide mopping temperatures not below +204°C (+400°F) when measured at the mop cart and apply asphalt at a rate of 1.2 to 1.5 kg / m² (25-30 lb / sq.). Unroll membrane into asphalt a maximum of 1.2 m (4') behind mopping application.

.2 Torch Application: Torch onto suitable substrate or base sheets, fully bonding membranes and ensuring fully bonded side and end laps.

.3 Adhesive Application: Apply MBA Gold (880-10) Adhesive according to Bakor’s recommendations.

.4 Self Adhered: Use NP180 Tack as base sheet and / or base stripping in two ply assemblies over acceptable substrates or structural deck. Contact Henry Company Canada representative for specific recommendations.

.5 Mechanically Fastened: Base sheets to be a minimum 180 g polyester and nailed 150 mm (6") o/c at edges and 300 mm (12") o/c both ways throughout the field. Consult Henry Company Canada for recommendations on screw and plates for mechanically fastening.

.6 Use of cant strips is optional; where not used, install base sheet to the base of vertical surface; where used, install base sheets to top of cant.

.7 Apply membrane parallel to slope on slopes of 1:12 (1" in 12) or greater and nail head laps 50 mm (2") in from top edge at 150 mm o/c.

.8 Use nails with tin discs or 25 mm (1") minimum diameter head semi-solidly attached.

.9 Offset membrane laps between plies a minimum of 300 mm (12") for side and 450 mm (18") for end laps.

.10 Lap base and cap sheets 75 mm (3") on sides and 150 mm (6") on ends.

.11 Cut corner of membrane to be overlapped on a 45 degree angle where T-joints occur at end laps of cap sheets.

3.5.2 BASE SHEET APPLICATION

.1 Start at low point of roof; unroll and align base sheet; lap sides 75 mm (3") and ends 150 mm (6"); carry membrane to the top of cant.

.2 Nailed base sheet:

• Nail 150 mm (6") on centre at edges and 300 mm (12") on centre both ways throughout field.

.3 Mopped base sheet:

• Apply 1.0 to 1.5 kg / m² (20 to 30 lb / square) hot asphalt evenly and consistently; mop maximum 1.2 m (4') ahead of roll.
• Unroll base sheet into hot asphalt; apply even pressure on roll, do not kick out; ensure a small amount of asphalt is pushed out at seams.

.4 Torched base sheet:

• Heat lower surface of membrane uniformly without excessive heat; heat both substrate and membrane simultaneously, fully bonding membrane.
• Ensure sufficient heat applied to create a bleed out at all lap edges.

.5 Adhered base sheet: (use where other systems are not practical or acceptable)

• Apply 0.75 to 1.0 L / m² (1.5 to 2.0 gal / square) of adhesive to prepared substrate. Contact Henry Company Canada for specific recommendations.

3.5.3 BASE MEMBRANE FLASHING APPLICATION

.1 Pre-cut flashing membrane to correct length to extend from 100 mm (4") on to the roof from toe of cant, up the cant, then up and over the fascia a minimum of 50 mm (2").

.2 Refer to Modified Plus flashing details.

.3 Vertical wall terminations should always (where applicable) be a minimum of 200 mm (8") above the roof surface.

3.5.4 CAP SHEET APPLICATION

.1 Unroll and align cap sheet parallel to base sheet; offset side laps 300 mm (12") and end laps 450 mm (18") minimum from those in base sheet.

.2 Lap sides 75 mm (3") and ends 150 mm (6"); carry membrane to top of cant, or to vertical wall if cants are not used.

.3 Mopped cap sheet:

• Apply 1.0 to 1.5 kg / m² (20 to 30 lb / square) hot asphalt evenly and consistently; mop a maximum 1.2 m (4') ahead of roll.
• Unroll cap sheet into hot asphalt; apply even pressure on roll, do not kick out; ensure a small amount of asphalt is pushed out at seams; sprinkle factory-supplied granules over asphalt bleed-out before it cools.

.4 Torched cap sheet:

• Heat lower surface of membrane uniformly without excessive heat; heat both membrane and base sheet simultaneously.
• Ensure sufficient heat is applied to create a noticeable bleedout at all lap edges, and cover bleedout with factory supplied granules.
• Condition granular surfaces which are to be overlapped by heating and setting granules with a steel trowel.

.5 Adhesive Cap Sheet:

• Apply 0.75 to 1.0 L / m² (1.5 to 2.0 gal / square) of adhesive to the base sheet according to Henry Company Canada’s recommendations.
• Ensure fully adhered application including sufficient bleed out (maximum 1/4") and cover excessive bleed out with factory supplied granules.

3.5.5 CAP MEMBRANE FLASHING APPLICATION

.1 Pre-cut flashing membrane to correct length to extend from 150 mm (6") onto the flat portion of the roof and up and over the fascia to a minimum of 50 mm (2") or terminate a minimum of 50 mm (2") higher than the base stripping on the vertical wall.

.2 Use torch applied cap membrane flashing wherever practical.

.3 Refer to Modified Plus flashing details.

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2 Membrane Assemblies

2.1 Exposed Membrane - Un-insulated

• Slope Limitation: No slope limitation (NOTE: SINGLE PLY MEMBRANE (Minimum 1:16 [1/2" in 12"])
• In-Service Performance: Min.: -40°C (- 14°F)
• Temperature of the Max.: +93°C (+200°F)

2.2 Exposed Membrane - Insulated

• Slope Limitation: No slope limitation
• In-Service Performance: Min.: -40°C (-14°F)
• Temperature of the Max.: +93°C (+200°F)

Note: In lieu of modified cap sheets, two plies of modified base sheets may be used with a flood coat and gravel or a Henry Company Canada reflective roof coating with manufacturer’s recommended smooth surface modified cap sheet.

2.3 Protected and Modified Protected Membrane Assemblies

• Slope Limitation: 1:6 (2" in 12")
• In-Service Performance: Min.: -40°C (- 14°F)
• Temperature of the Max.: +93°C (+200°F)

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