GAF Bulking Fiber

GAF Bulking Fiber is a soft, flexible high-tensile polyethylene fiber used as a general thickener for GAF coatings.

GAF Bulking Fiber can be used to bulk up coatings to make them brushable mastics. Thicker materials allow for fabrication of cants and filling around irregular surfaces. Excellent for flashing details, metal roof seams, inside and outside flashing details, round stacks, pipe legs, pitch pockets, conduit pipes, expansion joints, etc.

GAF Bulking Fiber is available in a 15 lb (6.8 liter) bag.

APPLICATION INSTRUCTIONS

Apply evenly by trowel or brush. Total coverage is dependent on the substrate; rough or porous substrates may require additional product. If fabric-embedment is required, refer to Liquid-Applied Roofing Manual.

Features & benefits

Person with notebook and pen, filling out application next to construction helmet.

About GAF Bulking Fiber application

Apply evenly by trowel or brush. Total coverage is dependent on the substrate; rough or porous substrates may require additional product.
GAF certified roofing contractor applying roof coating with bulk fiber.

GAF Acrylic Coatings Installation Guide

Easy-to-install acrylic elastomeric roof coatings offer durability, UV protection, and high reflectivity. Learn acrylic roof coating installation techniques from the pros.
GAF Commercial brochure showing commercial roofing systems

Commercial roofing products: solutions for every roofing need

From single-ply membranes to full system solutions, and state-of-the-art digital services to hands-on training. GAF offers the range of durable, easy-to-use products and services you need to succeed.
GAF Commercial Chairman's Circle Award for Commercial Roofing Excellence

GAF Commercial Chairman’s Circle

The GAF Commercial Chairman’s Circle recognizes exceptional contractors in the commercial roofing industry. Each year, GAF invites contractor businesses to join this key partnership based on shared business commitment, reputation, loyalty, capability, and philanthropy.

Resources for every professional

Contractor working on a commercial roof

Contractors

We’re building new plants for greater capacity, and better systems for faster response and greater visibility.
Contractor Resources
An architect drafting blueprints

Architects & Design Pros

We’re building better, faster, more accurate access to the information you need.
Design Resources
A commercial storage facility

Property managers & owners

Whether you manage one property or many, we’re building the products and programs you need to reroof, restore, or maintain your investment.
Building Resources
GAF employee outside flatbed truck with shingles

Roofing suppliers

Find tools, documents, and training designed by GAF to help you serve your customers.
Dealer Resources