Contractor installing Liberty self-adhering base sheet without flame or adhesives
Liberty SBS base sheet applied on low slope roof surface
Contractor installing Liberty self-adhering base sheet without flame or adhesives
Close-up of polymer-modified asphalt coating on Liberty base sheet

GAF Liberty SBS Self-Adhering Base Sheet Roll (200 sq. ft)

$129

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  • Peel and stick underlayment for asphalt shingle & metal roofs
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Fast, Flame-Free Installation for Low Slope Roofing Projects

Looking for a reliable base layer for your low-slope roofing system? The GAF Liberty SBS Self-Adhering Base Sheet Roll offers a simple, torch-free solution designed to provide long-lasting durability and quick installation. Sold at A+ Roofing Supply in Atlanta, GA, this 3 ft. x 66 ft. roll covers 200 sq. ft. and is ideal for use with Liberty Cap Sheets or other modified bitumen systems.

This sheet is reinforced with a tough glass mat, coated in polymer-modified asphalt, offering a strong foundation for weatherproof roofing systems. It’s designed to adhere to primed substrates without the need for hot asphalt, flames, or additional adhesives—reducing labor time and jobsite hazards.

Key Features:

  • 🔥 Flame-Free Installation – No torches, hot asphalt, or adhesives required

  • 🛠️ Glass Mat Reinforcement – Provides added strength and dimensional stability

  • 🏠 Ideal Base/Ply Sheet – For use with Liberty Cap Sheets or modified bitumen roofing

  • 🕒 Quick Setup & Cleanup – Minimal tools and mess required

  • Miami-Dade County Approved – Code-compliant for high-wind areas

Product Specs:

  • Roll Size: 3 ft. x 66 ft. (200 sq. ft.)

  • Application: Base sheet or ply sheet for low-slope roofs

  • Material: SBS polymer-modified asphalt with glass mat

Need help estimating quantities? Use the GAF QuickMeasure Tool for accurate measurements and a complete material list in under an hour. Learn more at gaf.com

Coverage Area (sq. ft.)

200 sq ft

Product Width (in.)

3 ft

Product Thickness (in.)

9.3 in

Unrolled length (ft.)

66

Application Method

Peel & Stick

Features

Waterproof

Material Construction

SBS Modified Bitumen

Returnable

90-Day

Squares (100sq. Ft)/Roll

2

Color Family

Charcoal

Cold Applied

Cold Applied

Fire Rating (UL 790)

Class A

Product Weight (lb.)

98 lb

Roofing Product Type

Low Slope Roofing

Rolled Roofing Type

Base sheet

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