Vapor Barrier In Garage Ceiling

The science of moisture movement.

Vapor barrier in garage ceiling. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. Install as directed typically cutting to fit and using a staple gun to attach the vapor barrier to the studs. If you re adding new garage doors be sure to install insulated options. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one.

It s also incorrect in a way. Now i m a real fan ha ha of controlled mechanical ventilation to limit interior moisture levels in cold and mixed climates as well as to. Water vapor can pass through building materials in several ways including direct transmission and by heat transfer but studies suggest that fully 98 percent of the moisture transfer through walls occurs through air gaps including cracks around electrical fixtures and outlets and gaps along baseboards. And the ceiling acts as a enough of a vapor retarder.

First of all a garage is not a signicant source of vapor as it is not occupied that much and you don t cook or bath in in it. So you don t need a vapor barrier in the garage ceiling. If you re using old uninsulated doors pick up a retrofit kit that add insulating panels. Not every wall does.