Building a home soon. My contractor says he uses closed cell foam on the outside of the blocks below and above grade on the walk out basement for insulation and to seal against water penetration into the basement. I,m concerned that the foam will not hold up below grade allowing water into the basement. If I'm wrong, won't I still need french drains around the basement to keep water pressure off the block walls. or should I use Block-Out on the outside and put the foam on the inside between the studs.
Posted Jun 19, 2014 4:15 PM ET
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