Since my crawl space will be conditioned by the HVAC system, I decided to use Totally-Foam to insulate it. The foam is approximately 2 inches thick and has approximately a R-21 insulation performance. It also is mold resistant with an anti-microbal agent, and is a vapor retarder (less than 1 perm). The foam also seals the sill plate to the top of the concrete wall as well as the bottom of the wall to the footing.
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