Closed Crawl Spaces/For Ted Clifton
I have read with interest Ted Clifton’s comments on closed crawl spaces, in which he advocates insulating the walls AND the floor (eg, comment #9 here: here). But, I’m unclear on teh recommended R value for floors.
What R value insulation should we install in the crawl space ceiling?
We are in CZ4 and have just closed our crawl space, including a 20mm polyethylene vapor barrier on cement floor and 2″ RMax (R13) on walls. We are considering following Ted’s suggested approach, for comfort in bedroom above (we have R3 stone walls on first floor of house). Code for floors here is R30, but the nominal cost for R38 is negligible. So all things being equal I would lean toward R38. R38C batts will fit in our 2×10 joists with minimal compression.