What is Vapor Barrier Insulation?

Vapor barrier insulation is insulation which comes packaged with a vapor barrier, eliminating the need to install one. Typically, this form of insulation comes in rolls which can be unfolded and cut to create strips of insulation for installation in a structure. The advantage to vapor barrier insulation is that it eliminates the additional step of installing a vapor barrier. The disadvantage is that it cannot be used in a structure which already has a vapor barrier, because two vapor barriers can create a vapor trap, which is very undesirable. In most regions of the world, vapor barriers are strongly recommended. A vapor barrier prevents water from entering the walls, floors, and ceilings of a structure, preventing rot, mold, and mildew. Typically, the vapor barrier faces the living quarters of the house, preventing moisture from leaching from the interior of the house to the walls. In very humid climates, the vapor barrier may be placed on the outside, so that moist air from the ...  more

Vapor barrier insulation is insulation which comes packaged with a vapor barrier, eliminating the need to install one. Typically, this form of insulation comes in rolls which can be unfolded and cut to create strips of insulation for installation in a structure. The advantage to vapor barrier insulation is that it eliminates the additional step of installing a vapor barrier. The disadvantage is that it cannot be used in a structure which already has a vapor barrier, because two vapor barriers can create a vapor trap, which is very undesirable.  more