vapor barrier

noun Building Trades.
a layer of material, as plastic film or foil, used to protect installed insulation by retarding the transmission of moisture from the interior environment.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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We think this is due to an inadequate vapor barrier.
Faced insulation has paper or foil on one side as a vapor barrier.
The orientation of the vapor barrier depends on the home's location or climate.
The orientation of the vapor barrier depends on the home's location.
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