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Old 11-09-2012, 02:24 PM   #1
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can foam board be used on interior?


i have an old 2 story farmhouse. the bathroom was gutted. the exterior walls are only 2x4 so r-13 insulation is being used.

On the face of the 2x4's can I use 1" foam board to give another r-5? then drywall over it.

What would the drawbacks of this be?

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Old 11-10-2012, 07:03 AM   #2
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can foam board be used on interior?


Drawback of this is that it will keep the framing even more cold and therefore increase the chance of condensation on them.

Foam to the inside is not a great idea when you are talking about covering the studs.

If you want additional R-Value in that wall, cut foam board to fit inside the wall and do a layer of foam first, then the batts.

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Old 11-10-2012, 09:00 AM   #3
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can foam board be used on interior?


this is what i was told to do, here. seems to be working very well. i am also going to do 1" xps under new siding.
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Old 11-10-2012, 09:37 AM   #4
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can foam board be used on interior?


Check your local building/fire code. Most foam board is not fire rated and code may call for you to cover it with a certain thickness drywall. I am fairly certain you could not meet code unless the foam was inside the framing and then covered. And as mentioned, you do not want to create a moisture barrier.

If you really want the r value, you would better off finding someone to come out and spray foam into the cavities if you can find someone willing to do a small job.
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Old 11-10-2012, 03:44 PM   #5
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can foam board be used on interior?


If you do "cut-n-cobble" to the cavities, use EPS rather than more expensive XPS, and it's a lot "greener" because of the blowing agent used.

1. Any OSB in the wall make-up?

2. Where are you located?

Gary
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