Do I Need A Vapor Barrier In Attic Insulation. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. If you are planning to have an attic insulation project for your home you may be wondering whether it is important to have a vapor barrier installed as well. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it.
Such a location works both as a vapor barrier as well as an air barrier and eliminates the need for an external air barrier not a easy application on a multi storried building as well as any special electrical pans and their sealing. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.
Once thought to be essential throughout a home or office vapor barriers are now strongly recommended only for certain conditions and methods for creating a vapor barrier must be tailored to fit the climate region and type of wall construction.
A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. For example the recommended vapor barrier in a home or office in a humid southern climate built with brick varies. Whether or not you need a vapor retarder hinges on three main factors. If you are planning to have an attic insulation project for your home you may be wondering whether it is important to have a vapor barrier installed as well.
