Roof system specifications
Download 3-part CSI specifications
View our new Roof Designer's Guide Book for an introduction of essential low-slope roofing concepts — from system components to codes, and sustainability to GAF support services — as well as an overview of GAF products that may be right for your specification.
Complex project? Get professional assistance with a custom package
Your regional GAF Design Services team can help put together a custom specification package, quickly and accurately. Start by choosing your roof type below.
Design best practice guides and resource files
Discover our wide range of roofing systems
GAF offers you a full line of roofing system solutions, including single-ply membrane, asphaltic coatings, and liquid-applied roofing, as well as waterproofing, polyiso insulation, and a complete line of innovative adhesives and accessories.
Promote positive drainage with tapered design
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