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Is there a technical problem if I install insulation with vapor barrier on both sides?

by LiveModern Webmaster last modified Jan 04, 2012 02:12 AM
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by last modified Jan 07, 2011



Old building codes used to require a vapor barrier on the "warm in winter side" of the wall.

New building science now advises not to install a vapor barrier on either side and definitely not on both sides. When your wall gets wet, you want it to be able to dry in both directions. A vapor barrier on both sides of your insulation will trap moisture inside your wall.




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