July 2005

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Low-slope reroofing guidelinesJoan P. Crowe, Tom Bollnow2005-07-01

Low-slope reroofing guidelines by Tom Bollnow and Joan P. Crowe, AIA Rate this article       Please login in order to rate an article. User name   Password     Click here, if you need to register for a Professional Roofing account. Be the first to comment

The NRCA Roofing and Waterproofing Manual, Fifth Edition, contains reroofing guidelines for steep- and low-slope roofing. The August 2004 issue of Professional Roofing featured an article that discussed the steep-slope text of the manual (see "Steep-slope reroofing considerations," page 28). This article focuses on the low-slope reroofing section.

Background

NRCA defines low-slope roof systems as a category of roofing that includes weatherproof types of roof systems installed with slopes less than or equal to 3-in-12 (14 degrees). Because each roof system is unique, it is not practical to address every condition that may be encountered during a reroofing project. The manual's reroofing section provides information applicable to many conditions commonly encountered during a reroofing project.

Low-slope roof assemblies typically are composed of a roof membrane, roof insulation, vapor retarder—when built in—and roof deck. Together, a roof membrane—including surfacing, insulation and vapor retarder—are considered a roof system. A roof system plus a roof deck are...

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