The Aluminum Foil Vapor Barrier is an important component for your sauna. Once installed it reflects heat back in to the sauna while protecting the structure by not letting moisture be absorbed into the outer structure. Plastic Vapor barriers will melt in the high heat of the sauna. Install foil so that it overlaps on studs, and secure with wood staples. Foil Tape or red Tuck Tape can be used to repair tears if necessary (Not Provided).
Aluminum Foil Vapor Barrier comes in two sizes. The small will cover up to 275 sq/ft, which is good for up to 5×8 sauna rooms. The large will cover 450 sq/ft, enough for most sauna rooms.