[Greenbuilding] Crawlspace foam insulation -- how much?

[Leslie Moyer]

I am in NE Oklahoma.  I'm in the process of getting estimates for 
crawlspace insulation in the floor joists--closed cell foam.  My crawl 
space is dry now that we've fixed some plumbing problems, but I'm having 
some cupping issues with some wood flooring and part of the fiberglass 
batts that were originally in the house when we bought it were taken out 
over time for this and that. Anyway--closed cell foam seems to be the 
best solution.

The first guy who came this morning wants to quote me 1.5" foam, though 
said he would quote 2" if that's what I really want, saying that would 
be enough for "Canada".  I understand about the benefits of air sealing, 
but I was still thinking I would need more inches of foam according to 
what I've read on R-value & this area. Thoughts?

-- 
*Leslie Moyer*

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