What Does a Vapor Barrier Do? A vapor barrier is designed to limit the movement of water vapor from one area of your home to another. Water vapor naturally moves through the air a ...

Attic rain occurs when warm, moist air inside your home enters the attic space and condenses on cold surfaces, such as the ...

While more insulation generally improves energy efficiency, it’s possible to overdo it. Adding excessive layers can compress the vapor barrier or block the ridge vents which can trap water vapor ...