A thin layer of impermeable material, typically polyethylene sheeting, included in building construction to prevent moisture from damaging the fabric of the building.
- This vapor barrier will prevent evaporation of ground moisture, thereby reducing the likelihood of condensation.
- It is the purpose of the vapor barrier to prevent that movement or penetration of moisture from one area to another.
- The necessity of constructing a vapor barrier for humidity control around the building - all museums require them - complicates things further.
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