Vapor barriers are impermeable membranes which usually prevent air and as a result moisture and water vapor to get inside the envelope of a structure. Vapor barriers should usually be installed on the warmer side of the insulation. When air gets inside the structure and water vapor starts diffusing out there are chances it would come in contact with cooler atmosphere outside and condense. Condensation of vapor on walls, inside cracks etc. could cause potential damage to structures. It might result in rotting of wood, rusting of steel structures and also freeze cracking of the walls.

Vapor barriers also help in interior humidification with lesser energy and water. Vapor barriers are usually thin materials made of aluminum foil, polyethylene plastic. Glass fiber batts are inserted in the spaces in between woodwork to prevent leaving any air gaps through moisture can enter the structure. Air leakage around the windows is also avoided by stapling vapor barriers.

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