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air retarder / barrier

air retarder
An air retarder or barrier is a material or structural element that inhibits air flow into and out of a building's envelope or shell. This is a continuous sheet composed of polyethylene, polypropylene, or extruded polystyrene. The sheet is wrapped around the outside of a house during construction to reduce air infiltration and exfiltration, yet allow water to easily diffuse through it.

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