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Can I use rigid foam inside and outside a concrete block wall?

user-246458 | Posted in Green Building Techniques on

I have a concrete block barn I am converting to a living space. I plan to use Insofast 2″ EPS panels on the interior which with the block gives me R-12 (Block at 3 and foam at 9). I would like to get a better R value, by adding foam to the outside. Would this create a moisture trapping problem?

How would I fasten the furring strips through the foam and into the block? I was thinking Tapcon screws.

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Replies

  1. GBA Editor
    Martin Holladay | | #1

    Philip,
    Q. "Can I use rigid foam inside and outside a concrete block wall?"

    A. Yes.

    Q. "Would this create a moisture trapping problem?"

    A. No.

    Q. "How would I fasten the furring strips through the foam and into the block? I was thinking Tapcon screws."

    A. That will work.

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