RUBEROID® MOP PLUS SMOOTH membrane is a premium, heavy duty, modified bitumen membrane manufactured to stringent GAF specifications. Its core is a strong, resilient non-woven polyester mat that is coated with flexible, SBS polymer modified asphalt and is smooth surfaced. Smooth-surface mop-applied installations must be protected with surfacing.


RUBEROID® MOP PLUS SMOOTH Membrane is designed for new roofing and reroofing applications as well as the construction of flashings. RUBEROID® MOP PLUS SMOOTH Membrane is also an ideal product for repairs of built-up roofing membranes or other modified bitumen systems.


  • Guarantees are available for up to 20 years.

  • Lightweight—installed roof designs weigh less than 2 pounds per square foot.

  • Durable —specially formulated modified asphalt gives RUBEROID® MOP PLUS SMOOTH Membrane lasting performance.

  • Resilient—RUBEROID® MOP PLUS SMOOTH Membrane’s heavyweight polyester mat core allows it to resist splits and tears due to its pliability and elongation characteristics.

  • RUBEROID® MOP PLUS SMOOTH membrane is backed by GAF, a company with over 100 years in the roofing business

Applicable Standards
Meets ASTM D6164, Type II, Grade S
FM Approved
ICC ESR#1274 Pending
UL/ULc Listed

Product Specifications (Nominal)
Roll Size 1 square (107.5 gross sq.ft.) (9.9m2)
Roll Length 32.56’ (9.9m)
Roll Width 39.625” (1006.5mm)
Approx. Roll Weight 80 lbs (36.29kg)
Product Thickness 0.120” (3.05mm)

This product meets or exceeds the following ASTM D6164, Type II, Grade S, minimum requirements:

Property Test Method Value
Tensile Strength @ 0°F (min), lbf/in ASTM D5147 100
Elongation @ 0°F (min), % ASTM D5147 20
Low Temperature Flexibility (max), °F ASTM D5147 0
Tear Strength (min), lbf ASTM D5147 70
Dimensional Stability, (max) % ASTM D5147 1


All documents are U.S. English unless otherwise noted

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