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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