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01grander 12-05-2013 03:37 PM

Crawlspace Insulation
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I had a question about installing insulation under my house. Please excuse the horrible drawings.

I saw someone install foam board insulation before and they placed smaller strips to each side to create a gap(air pocket).

See picture.

Which way is correct?

Gary in WA 12-05-2013 11:23 PM

Optimal installation, may require ignition barrier, check with local AHJ; Fig.7;

Depends on what you want for the end result;


01grander 12-06-2013 04:47 PM

I can't really use fiberglass batts because of the moisture where my house is located. It would just attract mold too much. The picture I drew was just for foam board to add some insulation since I currently have none.

Which of those would work best? The foam board directly to the underside of the flooring or leaving a gap by placing a thin strip on either side?

Fix'n it 12-07-2013 06:12 AM

my understanding is that gaps are bad.

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