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They help keep moisture from migrating into walls by diffusion but still allow for drying so it doesn t get trapped.
Attic insulation vapor barrier cellulose. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below. With our vapor barrier installation services there will be no issue of the crawl space of your home becoming a residence for pests bats and rodents. If you decide to go ahead with the plan to install cellulose on the attic floor you don t need a vapor barrier.
Since some leakage of moisture into the insulation in inevitable murphy s law you want it to be able to freely escape from the insulation into the attic. It s actually a smart vapor retarder since its permeability decreases as moisture content increases. Vapor barriers in attics should only be installed on one side of the insulation. Should you install a vapor barrier over preexisting attic insulation.
This article explains the necessary work. The best way to answer this question in addition to considering the factors above would be to talk to a professional. The us department of energy classifies cellulose insulation as a class iii vapor retarder. Air sealing an attic.
A vapor barrier is not only unnecessary but also can be potentially harmful especially during the summer months in air conditioned buildings when warm moist air passes through wall assemblies and condenses on the outside of the cool poly vapor barrier. The hygroscopic nature of cellulose insulation allows it to manage and wick moisture from areas of greater to lesser concentrations thus preventing damaging amounts of moisture from accumulating. Not be trapped inside. Insulation labs is a name to reckon with for efficient vapor barrier installation services.
Do not add a vapor barrier on top of the insulation in your attic since the paper facing on the existing insulation is the vapor barrier.
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