07 26 00 Vapor Retarders

07 26 00 Vapor Retarders

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8.5" x 11"


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07 26 00

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07 26 00 Vapor Retarders

Use this CSI 3-part SimpleSpecs™ master specification to specify vapor retarders to control moisture vapor transmission passage through the roof, wall, and floor floors.


The section includes materials used in interior and exterior assemblies where areas of different conditions occur. Such as steam rooms.


The term vapor retarder defines a material with a moisture vapor transmission rate of less than one (1) perm. The term vapor barrier is often used to describe these plastics, but that is discouraged. As it is nearly impossible to construct an absolute barrier.


The design professional should take careful consideration of various factors to prevent condensation within the roof, wall, and floor assemblies. Climatic conditions including mean summer and winter temperatures and average relative humidity, both indoor and outdoor, can have a huge effect on moisture vapor movement. In addition, the location of the vapor retarder within the assembly is critical.


In order to be effective, the vapor retarder must be continuous. With joints sealed and the vapor retarder sealed around all penetrations and at the perimeter.


Related Testing Standard:

ASTM E 1745 – Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs


ASTM E 1643 – Standard Practice for Selection, Design, Installation, and Inspection of Water Vapor Retarders Used in Contact with Earth or Granular Fill Under Concrete Slabs 


Related SimpleSpecs™ master specification:

03 30 00 – Cast-in-Place Concrete

07 28 00 – Weather Barriers 

31 32 13 – Radion Mitigation



vapor retarders

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