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Attic insulation vapor barrier or not.
Attic insulation vapor barrier or not. Not be trapped inside. Before the introduction of attic insulation attics in cold climates were poorly insulated and plastic ceiling vapor barriers were omitted. 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. Fiberglass insulation must stay dry to be effective.
Some regions don t require a vapor barrier. When considering the health of your attic the issue of moisture is exceedingly important. Never compress or fluff your insulation. Not every wall does.
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. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Even if it asks you to.
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. Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days. Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. A damp attic can also be the cause of discomfort and lower air quality in the living space.
Vapor barriers in attics should only be installed on one side of the insulation. The heat being lost from the house below warmed up the attic so that moisture was lost through the vents as vapor. 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 acts as a barrier to keep heated moist air from rising up into the attic during cold weather.
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