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What is the difference between a vapor barrier and a vapor retarder?

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What is the difference between a vapor barrier and a vapor retarder?

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To be considered a vapor barrier, testing results from ASTM F 1249 or ASTM E 96 must state a permeance of less than 0.01 perms (grains/[hour * ft2 * in. Hg]) A vapor retarder is classified by ASTM E 1745…

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