I have designed a 4920 sf house in Dallas with a sealed crawl space. The crawl space walls are concrete and a have 2x10 floor joist system on top of it. The crawl space walls are insulated with 1” Polyiso and the rim joist is insulated with 5.5 open cell foam. The walls above are R23 BIBs in cavity + R5 exterior rigid foam over sheathing, and 5.5 open cell foam on the floor truss rim. The attic i…
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