Description
#75 Roofing Base Sheet Roll
GAFGLAS® #75 Base Sheet is a premium built-up roofing (BUR) asphaltic base sheet made with a strong glass mat. Its closed-sheet design helps prevent asphalt bleed-through and can serve as a flame retarder when used under torch-applied modified bitumen membranes.
Key Features:
- Easy Installation: Rolls out flat for quicker, easier placement.
- Closed-Sheet Design: Coated on both sides to help prevent asphalt bleed-through.
- Fire Performance Support: Designed to meet UL Class A ratings and can act as a flame retarder in torch-applied systems.
- Commercial-Grade Standards: Listed/approved to multiple standards and approvals including ASTM D4601 Type II and UL/ULC listings.
- Jobsite Coverage: One 3-square roll provides 300 sq. ft. of coverage.
Specifications Table:
| Specification | Details |
|---|---|
| Product Name | GAF #75 Base Sheet 3SQ/RL |
| Product Description | GAF #75 Base Sheet 3 Square Roll |
| Category | Roofing Materials |
| Subcategory | Built-Up Roofing (BUR) Asphalt Membranes |
| Unit of Measure | RL – Roll |
| Roll Coverage | 300 sq. ft. (3 squares) |
| Roll Size (Width x Length) | 39-3/8 in. x 97 ft. 6 in. |
| Packaging | 3 SQ. Roll |
| Material / Reinforcement | Strong glass mat |
| Sheet Design | Coated on both sides; closed-sheet design to help prevent asphalt bleed-through |
| Use Case | Suitable for nailable specifications (e.g., plywood) where bleed-through is a concern |
| System Compatibility / Performance Note | Sealed sheet serves as an effective flame retarder for application of torch-applied modified bitumen membranes |
| Fire Rating Design Note | Designed to meet UL Class A ratings |
| Applicable Standards / Approvals | ASTM D4601, Type II; FM Approved; ICC ESR-1274; Miami-Dade County Approved; UL/ULC Listed |
| Manufacturer Product Number | GAF75BS |
| Manufacturer Number | 3300000 |
| Item Weight | 75 lb |
| Style | Built Up Roofing |
Frequently Asked Questions (FAQ):
Q: What is this base sheet used for?
A: It’s a BUR/asphaltic base sheet used as an underlying ply in commercial roofing systems and is also used where bleed-through is a concern (such as plywood nailable decks).
Q: How much area does one roll cover?
A: Each roll is a 3-square roll and covers 300 sq. ft.
Q: What are the roll dimensions?
A: The roll size is 39-3/8 in. wide x 97 ft. 6 in. long.
Q: Can it be used with torch-applied modified bitumen?
A: Yes—its sealed, closed-sheet design can serve as an effective flame retarder for torch-applied modified bitumen membrane applications.
Q: Does it meet recognized industry standards?
A: Yes—applicable standards/approvals listed include ASTM D4601 Type II, FM Approved, ICC ESR-1274, Miami-Dade County Approved, and UL/ULC Listed.
The Unsung Foundation of a Fearless Roof
Luxury starts with what you don’t see—the quiet, decisive layer that makes everything above it perform beautifully. This GAFGLAS® #75 base sheet brings a refined, engineered confidence with its strong glass mat and closed-sheet design that helps resist asphalt bleed-through. Think of it as the tailored lining inside a couture jacket: invisible, essential, and impeccably functional. When you’re building for longevity and elevated performance, this is the foundational move that sets the tone.
Build your roofing system on a stronger foundation—choose GAFGLAS® #75 Base Sheet for reliable coverage and commercial-grade performance.
