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.

Nearby words

  1. vape pen,
  2. vaphio,
  3. vapid,
  4. vapidly,
  5. vapor,
  6. vapor lock,
  7. vapor pressure,
  8. vapor tension,
  9. vapor trail,
  10. vaporescence

Origin of vapor barrier

First recorded in 1940–45 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019