Attic Vapor Barrier

Most forms of attic insulation benefit from the addition of a vapor barrier to protect them from the harmful effects of moisture which can reduce their effectiveness over time the following are a few simple steps to help you undertake the task properly so your vapor barrier retains heat without damaging the insulation. Even though we apply vapor barriers to exterior insulated walls in cold climates it s no longer recommended for ceilings floor of the attic. Because it s nearly impossible to seal penetrations in the ceiling the reality is water vapor will get into the attic.

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In existing spaces oil based paints or vapor barrier latex paints offer an effective moisture barrier.

Attic vapor barrier.

On the other hand an air barrier a properly detailed air tight drywall ceiling for example in the absence of a vapor barrier can be effective since it stops the flow of vapor laden air. 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. Some regions don t require a vapor barrier. 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.

The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it. A vapor barrier in an attic assembly in a severely cold climate with the absence of an air barrier will likely be ineffective. The inner surface in colder climates and the outer surface in hot humid climates. Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions.

Attic vapor barrier detail for cold climates.

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