Foundation Wall: Insulation Question - AVS Forum
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post #1 of 5 Old 05-05-2013, 02:58 PM - Thread Starter
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Hi guys...

I've insulated my poured foundation with 2" XPS foam adhered with the proper glue. I then have a 1" air gap, then my stud wall. I'd like to place fiberglass R13 into the stud cavities for further insulation and sound help (north east US climate). When placing in the unfaced batts, should I be concerned about it falling out of the wall into the 1" air gap, resting on the XPS? For moisture control, I heard the 1" gap is good, but wondering how folks maintain that gap when putting in the insulation, or if they even worry about it?

Thanks!
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post #2 of 5 Old 05-05-2013, 03:24 PM
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a standard bat of insulation will stay in a 16" oc bay with just the compression of the insulation, as long as the seams of your foam board are sealed that is your vapor barrier, you do not need a second vapor barrier.
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post #3 of 5 Old 05-05-2013, 06:20 PM
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Make sure you use unfaced -- you definitely don't want a 2nd moisture barrier in place.

It will simply tuck into the stud bay -- I'd be surprised if you had any significant movement.

John
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post #4 of 5 Old 05-05-2013, 07:47 PM
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I just did this in my basement as well. The batts are made a 1/2" wider than the distance between your studs, so it'll will stay in place. If for some reason if did want to fall in as you're installing it you could staple it to the sides of the studs, but as stated above, you probably won't run into that problem.
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post #5 of 5 Old 07-11-2013, 05:57 PM - Thread Starter
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Once again, thanks guys! I know I'm a bit late with that, but you were a big help!
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