Installing Vapor Barrier In Attic

The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.

Installing vapor barrier in attic.

Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers. How to install radiant barrier on attic rafters in 5 steps. While you are inspecting the attic check to see if there is a vapor barrier under the attic insulation. If you are ready to clean up your crawl space and install a vapor barrier contact attic projects for a custom estimate or give us a call at 858 246 7421.

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. Never compress or fluff your insulation. Not be trapped inside. In existing spaces oil based paints or vapor barrier latex paints offer an effective moisture barrier.

The vapor barrier might be tarpaper kraft paper attached to fiberglass batts or a plastic sheet. If there does not appear to be a vapor barrier you might consider painting the interior ceilings with vapor barrier paint. You want to add the foil on all surfaces that make up the roof but you also need to keep vents open and clear of the foil. The goal of adding a radiant barrier in your attic is to cover as much of the underside of the roof as possible.

Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. The inner surface in colder climates and the outer surface in hot humid climates. Measure the entire area and write down the results.

To install an efficient vapor barrier you need the dimensions of the room. Vapor barriers in attics should only be installed on one side of the insulation. Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days. Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions.

Take the measurements with you when purchasing materials. Do not overlook attic access door. You can forego the plastic and use a vapor retarder kraft faced insulation or latex ceiling paint in all other climates except hot humid or hot dry climates. Contact us for a free estimate.

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.