- Q. Will a vapor retarder be effective on the walls if there is no retarder in the ceiling?
A.A vapor retarder and air barrier will keep the moisture in the living area from being pushed into the wall cavities. While it would be better if there was a vapor retarder in the ceiling as well, it is much easier to ventilate the attic to avoid moisture problems than to remove moisture from the wall cavities.
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