A Guide to Vapor Retarder Design In Low-slope Roof Systems
Installation Instructions and Guides
About GAF SA Vapor Retarder XL
GAF SA Vapor Barrier XL is a self-adhered, vapor-inhibiting membrane designed for use in approved roofing membrane assemblies. It’s composed of a trilaminated woven polyethylene facer combined with an advanced, high-tack butyl rubber adhesive. The under-face is applied with a split silicone release film that is removed during installation. This uniquely durable product exhibiting high tensile strength can be left exposed for up to 180 days when installed in accordance with published GAF specifications and details.
Benefits of GAF SA Vapor Retarder XL
Designed to be self-sealing with increased adhesion performance, GAF SA Vapor Retarder XL provides three times the peel strength compared to self-adhered modified bitumen vapor barriers.
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EASY TO USE
No primer required prior to installation. Creates a slip-resistant embossed walking surface. -
MORE DURABLE THAN EVER
High tensile strength. Can be left exposed for up to 180 days when properly installed. -
FIRE RATED DIRECT TO METAL DECK
ASTM E108 Class A and FM 4470 Class 1 Fire Ratings directly over steel deck
Product Documentation
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GAF SA Vapor Retarder XL & XL40 SDS - 4042
Safety Data Sheets
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SA Vapor Retarder XL Data Sheet - COMGN847
Data Sheets
Installation
Fast and easy to install.
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Step 1: Kick out the roll, maintaining 3" end and side laps.
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Step 2: Maintain proper placement to the previous roll.
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Step 3: Carefully peel back the silicone release film.
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Step 4: Peel the liner low and at a 45-degree angle. Use a weighted roller to smooth the membrane.
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