About GAFGLAS® Mineral-Surfaced Cap Sheet

The glass base resists the effects of moisture on the roof system while the aesthetically attractive granule surface provides an ultra-violet protective surface and requires no additional surface coatings. UL Class A, B, or C membrane constructions are available and system guarantees are available for up to 20 years.

  Length Width Square Feet Per Rolls Weight 

1.00 SQUARE

 32.6' (9.9 m) 39.4" (1.0 m) Approx. 106.9 gross sq. ft. (9.9 m2)  68 lb. (30.8kg)
1.25 SQUARE 40.7' (12.7 m) 39.375" (1.0 m) Approx. 134 gross sq. ft. (12.5 m2)  87.5 lb. (39.7kg)

Product Documentation

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GAFGLAS® Mineral-Surfaced Cap Sheet

SBS, APP & BUR roof system product comparisons

Any discussion on asphaltic roofing will involve one or more of these three terms: SBS (Styrene-Butadiene-Styrene), APP (Atactic Polypropylene), and BUR (Built-up roofing). SBS and APP are polymers with unique characteristics, and membranes made with them are classified by ASTM numbers, types and grades. BUR is an assembly method in which multiple layers of felts are installed with hot asphalt in-between.
GAFGLAS® Mineral-Surfaced Cap Sheet

When is an Asphaltic System the Right Choice?

With the wide variety of roofing technologies available, an asphaltic solution can be your best choice when you’re looking for multi-ply redundancy, enhanced durability, proven performance, high wind uplift and fire-rated assemblies, lower long term performance risk for issued guarantees, high compatibility with other roofing systems, and simplified owner maintenance. Architects and consultants often specify asphaltic solutions for applications such as K-12 schools, higher education low slope buildings, hospitals, data centers, and high-profile federal government projects.
GAFGLAS® Mineral-Surfaced Cap Sheet

Membrane Base & Cap Sheet Surfacing Options

Asphaltic base and cap sheets come in a wide range of surfacing options — including silica, talcum powder, polyolefin burn-off film, standard and bright white granules, embossed aluminum film, and more — to help accommodate your installation methods and meet your durability and reflectivity expectations.
Asphaltic Roofing 101 Playlist from GAF Commercial

Asphaltic Commercial Roofing 101

Proven historical performance. Time tested durability. Asphaltic roofing products are a go-to material of choice for high end low-slope buildings. Learn more about asphaltic technologies and application techniques, as well as how to decide if asphaltic is the right roofing solution for your next project.
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