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Keeping out the air



Air retarder; spray polyurethane foam (SPF); built-up membrane; polymermodified bitumen membrane; adhered single-ply membrane roof systems

In March, NRCA published Guidelines for Air Retarders in Roof Assemblies, a new document that provides an overview of the energy code’s air barrier requirements, industryconducted research and NRCA’s recommendations for designers about air retarders in roof assemblies.

Note: Documents in this section are provided as Adobe Acrobat PDF files. In order to print and view PDF files, the Adobe Acrobat Reader software/plugin, which runs on Microsoft Windows, Macintosh, OS/2 and various versions of UNIX, must be installed on your computer. Adobe Acrobat Reader is available for download as freeware from Adobe Acrobat's website. Please note that the resolution of on-screen versions is not as high as printed versions of PDF files.

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