Modified Bitumen Roofing - Ruberoid SBS HW 25


Formerly Ruberoid® SBS Heat-Weld 25


RUBEROID® HW 25 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, polymer modified asphalt.


RUBEROID® HW 25 SMOOTH is designed for new roofing and recovering applications as well as in the construction of flashings. RUBEROID® HW 25 SMOOTH is an ideal base or interply roofing membrane in modified bitumen systems


  • System guarantees are available for up to 20 years

  • Cost effective – the installed cost of SBS HEAT-WELD™ systems is less than most single-ply systems on the market today

  • Lightweight – installed roof designs weigh less than two pounds per square foot

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

  • RUBEROID® HW 25 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
ICC ESR#1274
Miami-Dade County Product Control Approval
State of Florida Product Approval
UL/ULc Listed

Product Specifications (Nominal)
Roll Size 1.5 squares (163.75 gross sq. ft.) (15.2 m2)
Roll Length 49.2' (15 m)
Roll Width 39.375" (1.0 m)
Approx. Roll Weight 105 lbs (47.6 kg)

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

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