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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Nearby words
- vape pen,
- vaphio,
- vapid,
- vapidly,
- vapor,
- vapor lock,
- vapor pressure,
- vapor tension,
- vapor trail,
- vaporescence
Origin of vapor barrier
First recorded in 1940–45
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019