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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.
Origin of vapor barrier
1940-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for vapor barrier
  • 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.
  • If the ground is not covered by an air-vapor barrier, large amounts of water vapor can escape into the crawl space.
  • The roof system must be attached to the substrate and vapor barrier approved by the manufacturer.
  • In addition, it is recommended that a vapor barrier be provided.
  • If a vapor barrier is not used, condensed moisture can reduce effectiveness of insulation and damage structural members.
  • vapor barrier coatings to be non-flammable, fire resistant, polymeric resin.
  • Restore vapor barrier on cold insulation and seal off to adjacent vapor barrier surfaces.

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