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GAF GAFGLAS #80 Ultima Base Sheet 39.375 in. x 65.2 ft. Roll, Black
Regular price $97.25Orders start at $399 — combine any items to reach the minimum. Learn more
GAF GAFGLAS #80 Ultima Base Sheet 39.375 in. x 65.2 ft. Roll, Black
GAFGLAS #80 Ultima Base Sheet is a high-performance, asphalt-coated, glass-reinforced roofing base sheet supplied in a 39.375 in. x 65.2 ft. roll. Its special Loctite closed-pore design prevents bleed-through while providing long-lasting leak protection in demanding applications. Use it under tile roofs, in BUR systems, and as a flame retarder in torch-applied modified bitumen assemblies.
Key Features:
- Glass reinforcement: An asphalt-coated, glass-reinforced sheet built for high performance in demanding roofing applications.
- No bleed-through: The special Loctite closed-pore design prevents asphalt bleed-through.
- Leak protection: Provides long-lasting leak protection, recommended where the potential cost of leak damage is severe.
- Flame retardant: Acts as an effective flame retarder when used in torch-applied modified bitumen systems.
- Organic felt replacement: Can be used in place of organic felts under tile roofs or in BUR systems.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | GAF |
| Sell unit | 1 roll, 39.375 in. x 65.2 ft. |
| Product line | GAF GAFGLAS #80 Ultima Base Sheet |
| Available colors | Black |
| Available sizes | 39.375 in. x 65.2 ft. |
| Material | Asphalt-coated, glass-reinforced base sheet |
| Dimensions | 39.375 in. x 65.2 ft. |
| Finish / texture | Closed-pore design (Loctite) that prevents bleed-through |
| Intended use | Base sheet for BUR systems, under tile roofs, and in torch-applied modified bitumen systems |
Coverage & How Much You Need:
One roll measures 39.375 in. wide by 65.2 ft. long, roughly 213 sq. ft. of sheet before laps; calculate actual coverage after deducting head and side laps per your system specification.
Fit and Compatibility:
Use as the base sheet in GAF BUR and modified bitumen systems, under tile roofs, or in torch-applied assemblies as a flame retarder. Ply sheets, cap sheets and adhesives are sold separately; confirm lap and attachment requirements with the specified system.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One roll of GAFGLAS #80 Ultima Base Sheet, 39.375 in. x 65.2 ft., black.
Q: How much area does a roll cover?
A: The roll is about 39.375 in. x 65.2 ft.; net coverage depends on the laps required by your roofing system specification.
Q: Can it be used in torch-applied systems?
A: Yes, it serves as an effective flame retarder when used in torch-applied modified bitumen systems.
Q: Does it replace organic felt?
A: Yes, it can be used in place of organic felts under tile roofs or in BUR systems.
Q: What prevents asphalt bleed-through?
A: The sheet's special Loctite closed-pore design prevents bleed-through.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Choose #80 Ultima where leak consequences are severe, such as roofs over high-value interiors, because its closed-pore design stops asphalt bleed-through and reinforces the base ply. Its glass reinforcement also makes it a dependable organic-felt replacement under tile. Verify lap orientation and nailing or mopping rates against the specified GAF system before starting.
Torch-applied installation requires trained personnel, a fire extinguisher on the roof and a fire watch after work ends each day.
Order GAF GAFGLAS #80 Ultima Base Sheet for premium leak protection on your next BUR or modified bitumen roof.
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