After doing a little research and pricing I think I'm leaning toward using rigid foam and great stuff. There is added work there to install it, but the price difference is pretty huge. A 200 board foot kit of spray foam would cost me $425 shipped. That would give me about 1.75" thick layer on the wall with an R value of just under 11. Alternatively, I can get 1" polyiso with an R value of 6.5 for $60 for the whole wall. Great stuff would be an additional $20 maybe? If I wanted to double up the polyiso I could easily do that and still be at half the cost of the spray foam.
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