Should I Use A Vapor Barrier In My Attic

On the other hand an air barrier a properly detailed air tight drywall ceiling for example in the absence of a vapor barrier can be effective since it stops the flow of vapor laden air.

Should i use a vapor barrier in my attic.

I want to install insulation in my attic floor which i use for storage. A vapor barrier in an attic assembly in a severely cold climate with the absence of an air barrier will likely be ineffective. However all attics vented or unvented and in all climates should have an air barrier such as an airtight drywall ceiling. The roof has continuous ridgeventing so air flow is not the culpret.

The attic studs and floor of the garage attic are configured in. Attic vapor barrier detail for cold climates the best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier. The previous owner has 1 foam insulation with a a plastic vapor barrier only on the rafters of the roof about4 from the slate roof but not on the walls of the attic. You have loose fill insulation in the attic which doesn t have a vapor barrier.

The theory is that part of the moisture vapor in the house is actually blocked by the drywall and paint on the. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.