#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: Its 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: Yesits 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: Yesapplicable 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 dont seethe 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 youre building for longevity and elevated performance, this is the foundational move that sets the tone.

Build your roofing system on a stronger foundationchoose GAFGLAS #75 Base Sheet for reliable coverage and commercial-grade performance.

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