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Old 02-23-2010, 07:26 AM   #1
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Adding Foam Board to Exterior Wall Cavity


Still have to talk to the county building department about this, but need you thoughts.

While I have an exterior wall open (from the interior), I want to add a piece of 3/4" foam board in contact with the exterior sheathing. The seam along the studs will be sealed. Then kraft faced insulation will be re-installed. The framing will then be covered with required thickness sheetrock.

Are there any thermal, vapor, or moisture issues with this configuration?
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Old 02-23-2010, 08:27 AM   #2
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Put your location in your member profile.
Vapor barriers depend on climate and location.
Properly installed kraft facing IS a vapor barrier.
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Old 02-23-2010, 09:27 AM   #3
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Central N.C.
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Old 02-24-2010, 01:11 PM   #4
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Yes, kraft faced insulation will be installed. I'm wanting to know if there are any issues with having the foam board behind the insulation and against the exterior sheathing?
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