Built-Up Roofing (BUR) - GAFGLAS #80 Ultima Base Sheet

GAFGLAS® #80 Ultima™ Base Sheet


GAFGLAS® #80 Ultima™ Base Sheet is a high performance, asphalt coated, glass-reinforced roofing base sheet. Special Loctite™ closed-pore design prevents bleed-through while providing long-lasting leak protection in a variety of demanding applications.


Heavyweight construction is ideal for all premium roofing systems:

  • For ultimate leak protection...
    In applications when the potential cost of damage from a leak is severe

  • As an effective flame retarder...
    When used in torch-applied modified bitumen systems

  • In place of organic felts...
    Under tile roofs or in BUR systems

  • Great for nailable systems...
    Where bleed-through can cause premature failure from deck movement (especially plywood decks)

  • For difficult roofing situations...
    Where the performance of a lighter-weight base sheet is inadequate

  • Enhances many systems...
    When used in place of standard base sheets, improves the overall performance of a BUR or modified bitumen system

  • Superior investment...
    When life cycle cost is more important than the initial installed cost


  • Helps prevent splitting and leakage...
    Closed-pore design means asphalt doesn’t bleed through, so system remains independent of deck movement when mechanically attached

  • Saves labor...
    Rolls out flat for easy installation

  • Reliable performance...
    Resists long-term curling and shrinkage that can cause premature roof failure (as can happen with organic products)

  • Inorganic Micro Weave Core...
    Helps prevent decay and provides superior tensile strength with dimensional stability

  • Highest fire rating...
    For use in UL Class A rated assemblies

  • 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
State of Florida Product Approval
UL/ULc Listed

Product Specifications (Nominal)
Roll Size 2 squares (214 gross sq. ft.) (19.9 m2)
Roll Length 65.2' (19.9 m)
Roll Width 39.3752' (1.0 m)
Approx. Roll Weight 80 lbs (36.3 kg)


All documents are U.S. English unless otherwise noted

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