A vapor barrier is a material used in construction to prevent the movement of water vapor through building materials. It’s typically installed in walls, floors, and ceilings to control moisture transmission and prevent issues such as mold growth, wood rot, and deterioration of insulation.

Vapor barriers are commonly made of plastic or foil sheets and are installed on the warm side of a building’s insulation, where they act as a barrier to prevent moisture from entering the building envelope. This helps maintain the integrity of the building structure and improves energy efficiency by reducing the risk of condensation and heat loss.

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