Do I Need A Vapor Barrier In Attic

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. You have loose fill insulation in the attic which doesn t have a vapor barrier. The theory is that part of the moisture vapor in the house is actually blocked by the drywall and paint on the.

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Because it s nearly impossible to seal penetrations in the ceiling the reality is water vapor will get into the attic.

Do i need a vapor barrier in attic.

The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it. Not every wall does. However all attics vented or unvented and in all climates should have an air barrier such as an airtight drywall ceiling. 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.

In hot dry climates your attic can be vented though like in hot humid climates you should not install any vapor retarder or barrier. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Attic vapor barrier detail for cold climates even though we apply vapor barriers to exterior insulated walls in cold climates it s no longer recommended for ceilings floor of the attic. Plastic vapor barriers should only be installed in vented attics in climates with more than 8 000 heating degree days.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter.

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