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From the JLC Field Guide:
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Dr. Kay Cooksey
Dr. Kay Cooksey
Posted on
January 15, 2013
Comparing Vapor Barrier Permeance
Permeance is one of the essential properties of a vapor barrier—that’s why it’s...
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I have always considered the E 96 test method to be the “gold standard” for determining the water vapor transmission rate (WVTR) of a vapor retarder material,” says Craig. “However, I have come to appreciate that the F 1249 test method can provide very comparable results to E 96 and is in almost all cases the decided choice for testing very low-permeance materials.
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