ransley wrote:

I dont know what R value icynene is but there is R 7.5 foam from
Honywell, R 75 would be great if you could do it, code for my area
zone 5 is r35 but codes are minimums and outdated, Id say R 40 would
be a minimum , I have R 100. Doing all that work and not putting in
enough R would be a waste.

Icynene is only R3.5/inch, but doesn't offgas and doesn't shrink as it ages.

Just curious...did you calculate the payoff period for R100 over R50?

Chris