Attaching a vapor barrier to your insulation helps prevent the buildup of moisture and condensation. With a barrier in place, mold and mildew are much less likely to accumulate, helping to increase the life and effectiveness of both walls and insulation. Properly placed and installed vapor barriers or vapor diffusion retarders can help prevent moisture problems in your home.

Proper placement of a vapor diffusion retarder depends on the local climate and how a home is constructed.

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