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NRCA issues interim updates to The NRCA Roofing Manual

In July, NRCA issued interim updates to the electronic versions of the 2014 and 2015 volumes of The NRCA Roofing Manual. The updates are intended to maintain the manual as a current authoritative roofing industry technical reference. Following is a brief overview of some of the more significant changes.

2014 volume update

Guidelines for determining design temperature gradients through roof assemblies' cross-sections have been added to the Condensation and Air Leakage Control section of The NRCA Roofing Manual: Architectural Metal Flashing, Condensation and Air Leakage Control, and Reroofing—2014. As it applies to low-slope roof systems, this new information is added in Chapter 2—Condensation Control for Low-slope Roof Systems beginning on page 206. For steep-slope roof systems, this information is added in Chapter 3—Condensation Control and Ventilation for Steep-slope Roof Assemblies beginning on page 220.

Determining and analyzing the design temperature gradient through a roof assembly can help designers determine operating temperatures of roof assembly components and the proper placement of a vapor retarder in a roof assembly.