Attic Insulation Vapor Barrier Or Not

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Some regions don t require a vapor barrier. 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.

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Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case.

Attic insulation vapor barrier or not.

Fiberglass insulation must stay dry to be effective. Not every wall does. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. The heat being lost from the house below warmed up the attic so that moisture was lost through the vents as vapor.

Vapor barriers in attics should only be installed on one side of the insulation. Even if it asks you to. When considering the health of your attic the issue of moisture is exceedingly important. 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.

This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses. You want to keep your attic as dry as possible to protect the area from mold and mildew as well as rot. Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers. Not be trapped inside.

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. Attic insulation vapor barrier or not. This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. A damp attic can also be the cause of discomfort and lower air quality in the living space.

Before the introduction of attic insulation attics in cold climates were poorly insulated and plastic ceiling vapor barriers were omitted. Never compress or fluff your insulation. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days.

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