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 of vapor barrier
First recorded in 1940–45
Words nearby vapor barrier
vape,
vape pen,
vaphio,
vapid,
vapor,
vapor barrier,
vapor lock,
vapor pressure,
vapor tension,
vapor trail,
vaporescence