This guide covers proper specification of water vapor transmission material properties of water resistive barriers and air barriers typically installed over exterior sheathing in building enclosures. The provisions contained in this guideline allow proper specification of water vapor transmission properties in accordance with the service conditions of these barriers, which shall improve design methodology, and provide more durable performance of designed wall and roof assemblies in service.
KeywordsBuilding enclosure, Hygrothermal model, water-resistive barrier, water vapor permeability, water vapor permeance, water vapor transmission
This guide should provide a rational foundation for proper specification of water-resistive barrier and air barrier properties with regards to water vapor transmission and allows adoption or implementation into building codes and specifications. This guide has been developed based on the current knowledge of building science, and should be used in conjunction with professional judgment and experience on case-by-case basis by code officials, designers, architects, engineers, and builders.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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