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Use of rigid foam exterior sheathing reduces the need for a Class Ior II interior vapor retarder. This insulated sheathing reduces theprobability of condensation inside the wall. In hot, humid weather,insulating sheathing acts as a vapor retarder and helps preventmoist outdoor air from entering the wall, reducing the potential forcondensation to form on the back side of the interior gypsum boardof air-conditioned homes. In cold weather, the exterior foam layerminimizes thermal bridging from the studs to the outside and keepsthe wall cavity temperature above dew point, reducing the likelihoodof condensation forming on the interior surface of the sheeting. Ifthe foam is taped at the seams and caulked at the edges, it serves asan air barrier and rain screen.
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