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Vapor Barrier

Vapor barrier is an impermeable membrane that blocks the flow of air through the building envelope.  A vapor barrier is an essential part of the building envelope.

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Vapor Barriers vs Air Barriers

Confusion on the issue of vapor barriers and air barriers is common. The confusion arises because air often holds a great deal of moisture in the vapor form. When this air moves from location to location due to an air pressure differences, the vapor moves with it.

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Building Construction - Moisture/Vapor Barrier

Vapor retardant slow the rate of vapor diffusion into the thermal envelope of a structure. Other wetting mechanisms, such as wind-borne rain, capillary wicking of ground moisture, air transport (infiltration), are equally important.

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Moisture Penetration & UV Light Transmittance

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