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.