Do I Need A Vapor Barrier For Attic Insulation. 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. Measure the entire area and write down the results. Whether using loose fill or batts put the vapor barrier closest to the warm side of your installation where hot moist air would get in facing the house s interior in cold climates beneath floor insulation and the attic s interior in hot climates on top of floor insulation.
Measure the entire area and write down the results. To install an efficient vapor barrier you need the dimensions of the room.
Measure the entire area and write down the results.
Whether or not you need a vapor retarder hinges on three main factors. With the added insulation the attic stayed cold and so did the ventilating air from outside which was now unable to effectively remove attic moisture. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it. Hence the need to reduce moisture flow into the attic and the need for a vapor barrier.
