Spray foam

Hey Tom,
Dan Frazell here again. In taking your advice I got an estimate for
some spray foam for my home. The company is Advanced Spray Foam out of
Clinton. Has some pretty solid testimonials on the website from all
over Maine. He has given me a quote of doing 3" of 1.7-1.9 ridged foam
in the attic and 2" of same in the basement walls and the crawl spaces
of my home. My question is, does that seem like the right amount depth
wise? I know nothing about this stuff and his estimate is not cheap
but this does seem like a practical way to go with this old of a home.
Thanks for the time,
Dan

Hi Dan,
I think the attic is a little low, unless the 3" is supplementing some
other insulation that is already there.
The 2" in the basement is great.
If you have a flat ceiling in the attic, you might consider 16" of
cellulose in the attic.
We are going for at least R-40. 3 inches of foam is about R-22.
Tom