Do I Need A Vapor Barrier For Attic Insulation

The facing on faced insulation acts as a vapor retarder. Attic vapor barrier detail for cold climates the best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.

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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.

Do i need a vapor barrier for attic insulation.

If you are planning to have an attic insulation project for your home you may be wondering whether it is important to have a vapor barrier installed as well. Such a location works both as a vapor barrier as well as an air barrier and eliminates the need for an external air barrier not a easy application on a multi storried building as well as any special electrical pans and their sealing. I install my vapor barrier in the middle of the wall system between the two walls. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. 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. If you need a vapor barrier and your insulation is unfaced you must cover it with a polyethylene film. Hence the need to reduce moisture flow into the attic and the need for a vapor barrier.

To be able to answer this question correctly for your home there are a few factors you need to consider before any major attic insulation project. In mixed climate areas the vapor barrier is optional depending on the total design of a building. With the added insulation the attic stayed cold and so did the ventilating air from outside which was now unable to effectively remove attic moisture. Not every wall does.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. Whether or not you need a vapor retarder hinges on three main factors. This worked well until we added large quantities of attic insulation. In cold climates a vapor barrier is almost always needed.

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