Modified Bitumen Roofing - Ruberoid SBS HW Smooth

SA Vapor Retarder


GAF SA Vapor Retarder is an SBS modified bitumen vapor retarder for use in approved GAF roof assemblies. GAF SA Vapor Retarder is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with a high tack self-adhesive. The topside is surfaced with high-strength trilaminate polyethylene film and the underside is surfaced with protective polyolefin release film that is removed during application.


  • 45" (1.1 m) roll provides increased coverage across roof deck

  • Easy-to-peel release film for faster installation

  • Durable top surface protects roof from inclement weather

  • High tensile strength provides resistance to foot traffic


GAF SA Vapor Retarder may be applied to:

  • Steel

  • Plywood

  • Gypsum

  • Concrete

  • Asphalt Panels


GAF SA Vapor Retarder can be applied at temperatures between 50°F (10°C) and 100°F (38°C). All substrates except metal decks must be primed. Vapor retarder should be installed with minimum 3" (76.2 mm) side laps and 6" (152.4 mm) end laps.

Applicable Standards

  • FM Approved

  • UL Listed

  • State of Florida approved

Product Specifications (nominal)
Roll Size 5 squares (502.5 gross sq. ft.)
(46.68 m2)
Roll Length 134' (40.8 m)
Roll Width 45" (1.1 m)
Approx. Roll Weight 80 lb. (35.8 kg)

Typical Physical Properties
Property MD Value XMD Value Test Method
Thickness, mils (mm) 31 (0.8) 31 (0.8) ASTM D5147
Tensile strength, lbf/in
54 (9.5) 74 (13) ASTM D5147
Ultimate elongation @
73.4°F (23°C), %
33 25 ASTM D5147
Tear resistance, lbf (N) 95 (423) 103 (458) ASTM D1970
Static puncture, lbf (N) 90 (400) 90 (400) ASTM D5602
Lap adhesion, lbf/ft
68 (1000) 68 (1000) ASTM D1876
Water absorption, % 0.1 0.1 ASTM D5147
Peel resistance, lbf/in
5.4 (950) 5.4 (950) ASTM D903
Cold bending, °F (°C) -58 (-50) -58 (-50) ASTM D5147
Water vapor permeance,
perm (ng/Pa.s.m2)
0.03 (1.7) ASTM E96
Air permeability, L/s•m2 < 0.001 ASTM E283


All documents are U.S. English unless otherwise noted

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