To prevent this infiltration, air barriers work well. An air barrier prevents air movement while allowing moisture to pass through. The air barrier is wrapped over the exterior wall studs and should be carefully sealed where cut for penetrations such as plumbing and electrical access. This should be done in conjunction with good caulking practices and weatherstripping around doors and windows. The incorrect placement of vapor barriers can cause severe problems for the home owner.
Vapor barriers control the flow of moisture through the building envelope.
Concrete slabs do not require a vapor barrier. The faster the concrete dries, the stronger it is. Moisture moves through a wall based on pressure differences between one side of the wall and the other side. 6 Areas of high moisture production, like the kitchen and bathroom, should be vented to the outside by exhaust fans. It is best to place a vapor barrier on both sides of the wall.