Moisture Barrier Interior Walls
A vapor barrier s job is to keep water vapor in humid air from diffusing through one side of a wall and finding a cool surface inside the wall.
Moisture barrier interior walls. Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions. Moisture vapor barrier primer finish interior latex is a coating designed to reduce the loss of moisture through walls and ceilings. The inner surface in colder climates and the outer surface in hot humid climates. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one.
But if you use fiberglass insulation batts then a moisture barrier will prevent water and moisture from entering your walls and creating mold and mildew. When a vapor barrier is on the side of a wall where the dry air is i e outside in winter or inside in summer moisture problems can occur. Not every wall does. It combines a primer and finish in a single fast drying coat and is specially formulated for manufactured housing facilities.
Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating.