Poured Concrete walls not smooth enough for XPS?

the-tech-guyJuly 25, 2011

I am in the process of putting up XPS on my basement walls but noticed they are pretty rough in some areas. What is the best way to smooth them out? I assume they should be flat before putting up the XPS.

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If you're referring to the ridges between forms or the tie holes, a brick chisel and hammer will get off the loose material. Use ear and eye protection!

The irregularities will likely make it impossible to use foam glue. Instead, you'll have to use concrete screws and fender washer and/or one by twos.

    Bookmark   July 25, 2011 at 11:12PM
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The XPS I used was slotted for a fur strip which worked well. In some areas (closets) or where space was at a premium, I then secured my drywall right to the fur strips....no framing in front...

    Bookmark   July 28, 2011 at 3:44PM
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Yes, furring strips can be used across the face of XPS boards or in specially designed recesses on some boards, such as Formular Cel-Lok from Owens Corning.

Here is a link that might be useful: Building Science Corporation: Renovating Your Basement

    Bookmark   July 28, 2011 at 10:25PM
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