Everyday activities such as cooking, washing and bathing add moisture to the air in your home in the form of vapor. This vapor can become trapped inside walls resulting in mold and mildew growth, which can damage your home and present a potential health concern.
Vapor retarders keep the moisture in the air in your house from condensing in the wall cavities. Insulation with a vapor retarder already attached-such as MR® Faced, ComfortTherm® and Kraft-faced-is faced insulation.
Whether your vapor retarder is a facing or a film, it must be placed on the warm-in-winter side of the wall. If you live in a cold climate, place the vapor retarder between the interior of your home and the insulation. If you live in a hot, humid climate, place the vapor retarder toward the outside of the wall cavity.
Check your local building codes for vapor retarder requirements.