Vapor Barrier In Garage Ceiling

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.

Vapor barrier in garage ceiling.

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. It s also incorrect in a way. Unless you have converted your garage into a kitchen a bathroom a laundry room or a space that generates a lot of moisture even for that a dehumidifier can absorb all the moisture in the garage to keep the air dry. The science of moisture movement.

If you re using old uninsulated doors pick up a retrofit kit that add insulating panels. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. 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. Not every wall does. Thus installing vapor barriers on wall surfaces must. If you re adding new garage doors be sure to install insulated options.