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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.
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Word History and Origins
Origin of vapor barrier1
First recorded in 1940–45
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Example Sentences
The downside comes when that promise turns out to be false — if the buyer moves in only to find out that the roof needs replacing or the bathroom has no vapor barrier and mold is growing.
From Washington Post
LNG terminals are typically designed with vapor barriers at the perimeters.
From Washington Post
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