Tag: drainage plane

  • Understanding Air Barriers, Vapor Barriers, and Drainage Planes

    Subtitle:  These three terms refer to different materials that are easy to confuse Images:  Is housewrap a vapor barrier? What’s the purpose of building paperTypically referring to Grade D building paper, this product is an asphalt-impregnated kraft paper that looks a lot like a lightweight asphalt felt. The Grade D designation has come to mean…