GAF TPO 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: GAF

Contact Address: See Membership List in Section 1.

Product Group: REINFORCED THERMOPLASTIC POLYOLEFIN (TPO) MEMBRANE

Country of Origin: USA

Country of Manufacture: USA

Year First Installed

BC: 2002

Canada: 2002

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1 Description

GAF EverGuard® TPO thermoplastic polyolefin single-ply membrane systems have been engineered to provide premium performance at a very cost-effective price. Strong, flexible, durable EverGuard® TPO membrane is suitable for use in fully adhered, mechanically attached, and ballasted single-ply roof systems.

EverGuard® TSR roof systems utilize either a 0.45", .060", or.080" thick polyester scrim-reinforced thermoplastic polyolefin membrane. The membrane is supplied in 5 foot and 10 foot widths and is available in white, gray or tan.

EverGuard® TFB roof systems utilize either a 0.45", .060", or.080" thick polyester scrim-reinforced thermoplastic polyolefin membrane with polyester fleece backing. The membrane is supplied in a 5 foot and 10 foot widths and is available in white, gray, or tan.

EverGuard® Freedom TPO HW Roof Systems utilize 0.45" (1.1 mm) thick polyester scrim-reinforced thermoplastic polyolefin membrane. The membrane has factory applied adhesive and release film on the bottom side (self-adhered). Membrane seams are 6" wide (150 mm) and are heat welded.

1.1 GENERAL

The roofing assembly / material information published in the RoofStar Roofing Practices Manual does NOT represent a complete set of the manufacturers published data, nor does it represent a detailed specification. The preparation of a detailed specification is the responsibility of the design authority.

SYSTEM DESCRIPTION

.1 Everguard® TPO roofing systems are suitable for use in a wide range of commercial, industrial, and institutional projects.

.2 Range of application: new construction and reroofing.

DELIVERY, STORAGE AND HANDLING

.1 Store materials in a weather protected environment, clear of ground and moisture in accordance with manufacturer’s instructions.

.2 Do not apply roofing materials during inclement or threatening weather.

SITE CONDITIONS

.1 Slope Limitations:

Minimum slope: the roof system should be designed to prevent ponding of water on the roof surface. Ponding is defined as water that has not drained or dissipated within 48 hours after rainfall.

Maximum slope (mechanically attached system): 1:16 (12" in 12")

Maximum slope (fully adhered system: 1:16 (12" in 12")

Maximum slope (ballasted system): 1:3 (2" in 12")

.2 Application Temperature:

Minimum ambient temperature 4.4°C (+40°F)

Maximum ambient temperature 38°C (+100°F)

.3 Chemical incompatibilities: contact GAF for verification of compatibility.

STANDARDS AND APPROVALS

.1 Factory Mutual: For specific rating on roof assemblies, consult GAF Contractor Services.

.2 Underwriters Laboratories Class A, B and C

MANUFACTURER’S SERVICES

.1 Local GAF Commercial Specialists.

.2 Specification 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.

MEMBRANES

Consult the list of Accepted Materials by clicking on the MATERIALS link above.

ACCESSORIES

EverGuard® Cut Edge Sealant

Solvent based liquid for use with reinforced membranes.

EverGuard® Walkway Pads and Rolls

3 mm (1/8") thick extruded TPO available in yellow and gray.

EverGuard® Drain Inserts

Rigid, molded TPO.

EverGuard® Preformed Vent Boots

Rigid, molded TPO.

EverGuard® Preformed Corners

Rigid, molded TPO suitable for both inside and outside corners.

EverGuard® UN-60 Unreinforced Detailing Membrane

Unreinforced TPO membrane.

EverGuard® TSR-45 reinforced flashing strips

Reinforced TPO membrane 20 cm (8") wide.

EverGuard® Coated Metal Flashing

Coated galvanized metal for use in edge flashing.

ANCILLARY PRODUCTS

The selection or omission of roof insulations, vapour 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

Extruded Polystyrene Insulation: minimum 103kPa (15 psi) compressive strength.

Extruded Polystyrene Insulation: High Density: minimum 172kPa (25 psi) compressive strength.

Expanded Polystyrene Insulation: minimum 103kPa (15 psi) compressive strength.

Expanded Polystyrene Insulation: High Density: minimum 172kPa (25 psi) compressive strength.

.2 Separation Sheets:

Fiberglass Fire Sheet 10: Separation sheet installed over polystyrene foam insulation or over wood decks to obtain certain fire ratings.

Fiberglass Fire Sheet 50: Separation sheet installed over polystyrene foam insulation or over wood decks to obtain certain fire ratings.

Poly Separation Layer 85 g (3 oz.): Separation sheet installed beneath mechanically attached or ballast applied membranes to protect from smooth surfaces substrates. Also installed over ballast-applied membranes to protect from sharp edges of the ballast.

Poly Cushioning Layer 170 g (6 oz.): Separation sheet

.3 Mechanical fasteners: EverGuard® Fasteners and Plates.

.4 Adhesives:

EverGuard® TPO Bonding Adhesive: Solvent-based rubberised adhesive for use with TPO based membranes.

EverGuard® H2O Bonding Adhesive: Water-based rubberized adhesive for use with TPO based membranes.

.5 Sealants:

EverGuard® Caulking: one part polyurethane sealant.

EverGuard® Water Block Mastic: one part butyl-based high viscosity sealant.

EverGuard® 2-part Pourable Sealant: 100% solids epoxy based two part sealant

.6 Ballast:

Gravel conforming to ASTM D-1863-80; commercial grade, clean, dry, 6 mm to 19 mm (1/4" to ¾") in size, opaque to ultra violet light, crushed rock, gravel or stone.

1.3 EXECUTION

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.

INSULATION

.1 Mechanical Securement: fasten insulation over nailable decks and steel decks in accordance with RoofStar Guarantee Standards.

.2 Adhered Securement - Asphalt: Embed insulation in a full, uniform mopping of hot steep roofing asphalt at a rate of 1.5kg / m² (30 pounds per 100 square feet) over primed structural concrete decks.

.3 Adhered Securement - Adhesive: ribbon adhere insulation with urethane adhesive with 2.5 cm (1") beads spaced 30 cm (12") on center in the field of the roof and 15 cm (6") on center in the perimeter regions of the roof. Alternative, ribbon adhere insulation with urethane adhesive with 1.25 cm (1/2") beads spaced 15 cm (6") on center in the field of the roof and 7.5 cm (3") on center in the perimeter regions of the roof.

.4 Install wood nailers at the perimeter of non-nailable decks and on slopes of 1:16 (3/4" in 12") or greater.

SEPARATOR SHEET

.1 Install polyester or fibreglass separator sheet where required by RoofStar Guarantee Standards.

MEMBRANE INSTALLATION

.1 Start at the low point of the roof and perpendicular to the slope.

.2 Place roof membrane so that wrinkles and buckles are not formed. Roof membrane shall be mechanically fastened immediately after it is rolled out, followed by welding to adjacent sheets.

.3 Full width rolls shall be used in the field of the roof. Half sheets shall be used in the perimeter regions of the roof. Consult the EverGuard Application and Specification Manual to determine the width of the roof perimeter.

.4 Lap sides 127 mm (5") and ends 75 mm (3"); staggering end laps a minimum of 450 mm (18").

.5 All exposed sheet corners shall be rounded a minimum of 25 mm (1").

.6 Securement (mechanically attached systems):

• Roof membrane shall be mechanically fastened in the side lap areas with fasteners and plates of a type and spacing appropriate to the deck type and as required by the EverGuard Application and Specification Manual.
• The Metal plates shall be 12 mm - 19 mm (1/2" - 3/4") of the membrane edge. Plates must not be placed closer than 12 mm (1/2") to the membrane edge.
• The roofing membrane must be mechanically secured at the perimeter, at the base of the interior walls and curbs, and at all penetrations. Membrane may be heat welded to coated metal flanges.

.7 Securement (adhesive adhered systems):

• The roofing membrane must be mechanically secured at the perimeter, at the base of the interior walls and curbs, and at all penetrations. Membrane may be heat welded to coated metal flanges.

Cold Bonding Adhesive - smooth reinforced membrane: fully adhere membrane sheets with bonding adhesive at the rate of 3L / m² (120 ft² / gal) per surface for solvent-based bonding adhesives, and at the rate of 6.25L / m² (250ft² / gal) per surface for water-borne bonding adhesive. Apply bonding adhesive to both the underside of the membrane and the substrate surface. Prevent seam contamination by keeping the adhesive application a few inches back from the seam area. Lay membrane into the adhesive once the bonding adhesive is tacky to the touch. Broom the membrane to ensure a complete bond.

Cold Bonding Adhesive - fleece backed membrane: fully adhere membrane sheets with bonding adhesive at the rate of 1.5L / m² (60 ft² / gal) per surface for solvent-based bonding adhesives, and at the rate of 3 L / m² (120 ft² / gal) per surface for water-borne bonding adhesive. Apply bonding adhesive to the substrate surface only. Prevent seam contamination by keeping the adhesive application a few inches back from the seam area. Lay membrane into the adhesive once the bonding adhesive is tacky to the touch. Broom the membrane to ensure a complete bond.

.8 Hot Air Welding

Heat weld all seams and flashings using an automatic hot air welding machine or a hand welder and silicone roller.

Consult EverGuard® Application and Specification Manual for details of welding procedures, test cut requirements, and equipment.

Probe all seams and make necessary repairs at the end of each working day.

FLASHING

.1 Flash all walls and curbs with EverGuard® TSR Membrane

.2 Consult EverGuard® Application and Specification Manual for specific flashing substrate requirements or additional flashing details.

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