Built-Up Roofing (BUR) - GAFGLAS #75 Base Sheet

GAFGLAS® #75 Base Sheet


GAFGLAS® #75 Base Sheet is a premium roofing base sheet constructed with a strong glass mat that is coated on both sides to assure a closed-sheet design to prevent asphalt bleed-through. The sealed sheet also serves as an effective flame retarder for the application of torch-applied modified bitumen membranes.


GAFGLAS® #75 Base Sheet is engineered for use in the construction of GAFGLAS® built-up and RUBEROID® modified bitumen roofs. It is suitable for nailable specifications, such as plywood, where bleed-through is a concern.


  • Extra strength for excellent nail-holding ability. Superb tensile strength and resilience and no bleed through, thereby reducing risks of splitting and cracking of membrane
  • Will not rot, curl, or shrink; dimensionally stable for improved membrane performance
  • Designed to meet UL Class A ratings
  • Rolls out flat for easy installation
  • System guarantees are available for up to 20 years

Applicable Standards
Meets ASTM D4601, Type II
FM Approved
ICC ESR # 1274
Miami-Dade County Product Control Approval
UL/ULc Listed

Product Specifications (Nominal)
Roll Size 3 squares (320.1 gross sq. ft.) (29.7 m2)
Roll Length 97.5' (29.7 m)
Roll Width 39.375' (1.0 m)
Approx. Roll Weight 68 lbs (30.8 kg)


All documents are U.S. English unless otherwise noted

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