Modified Bitumen Roofing - Ruberoid 20



RUBEROID® 20 Smooth is a tough, resilient modified bitumen membrane manufactured to stringent GAF specifications. Its core is a strong, resilient non-woven glass mat that is coated with flexible, SBS polymer-modified asphalt.


RUBEROID® 20 Smooth is designed for new roofing and recover applications as well as in the construction of flashings. RUBEROID® 20 Smooth is an ideal base or interply roofing membrane in modified bitumen systems including GAF CompositeRoof™ and 20/30 systems.


  • System guarantees are available for up to 20 years

  • Lightweight — installed roof designs weigh less than three pounds per square foot

  • Durable — combines the strength of fiberglass reinforcement with the elongation characteristics of SBS modified asphalt

  • RUBEROID® 20 Smooth is backed by GAF, a company with over 100 years in the roofing business

  • Available as a smooth surface

Applicable Standards
Meets ASTM D6163, Type I, Grade S
FM Approved
ICC ESR#1274
Miami-Dade County Product Control Approval
State of Florida Product Approval
Texas Department of Insurance
UL/ULc Listed

Product Specifications (Nominal)
Roll Size 1.5 squares (165.1 gross sq. ft.) (15.3 m2)
Roll Length 49.2' (15 m)
Roll Width 39.375" (1.0 m)
Approx. Roll Weight 89 lbs (40.37 kg)
Product Thickness 0.085” (2.1 mm)

This product meets or exceeds the following ASTM D6163, Type I, Grade S, minimum requirements:

Property Test Method Value
Tensile Strength @ 0°F (min), lbf/in ASTM D5147 70
Elongation @ 0°F (min), % ASTM D5147 1
Low Temperature Flexibility (max), °F ASTM D5147 0
Tear Strength (min), lbf ASTM D5147 35
Dimensional Stability, (max) % ASTM D5147 0.5


All documents are U.S. English unless otherwise noted

Commercial Roofing EagleView Commercial Property Owners Portal Architects And Specifiers Green Roof Central


Product Princing and Where to Buy
© Copyright 2018 GAF | Privacy Policy and Legal | GAF Canada | GAF U.S.