The NRCA Leadership and Workforce Development Catalog now is available for download.

Positioning is everything

Abstract
A vapor retarder layer sometimes is specified as an additional component in low-slope roof systems to minimize the potential for condensation to occur. When used, a vapor retarder layer can reduce water vapor diffusion from a building’s interior into roof system components. For a vapor retarder layer to function as it should, it must be placed in a proper location within a low-slope roof system’s cross-section. The following are some guidelines for proper vapor retarder layer placement.
Date
5/2021
Author(s)
Mark Graham
Page(s)
22-24
Keyword(s)
retarder; layer; vapor; low-slope; diffusion



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.

Advertisement

Subscribe for Updates Join 25,000+ roofing professionals following NRCA

Subscribe to NRCA