Larry, with my kit I did the rim joist area of my basement shop, which is about 11x24. (I'm not at home to take exact measurements) It was 3 walls, and that works out to about 45ft by 8"(?) high by 4-6" of depth. Thicker on the short ends. I just fiddled with my calculator, and that is about 30 sqft, so if it was all 5" deep that is 150 boardft of foam. My kit claimed 200bdft. And when I was done I had enough to do about 25 bdft on the ceiling...
Given that I pulled these numbers all out of my fuzzy memory, (they might be 9" tall spaces, for instance) I think that works out pretty well correctly.
If you have 80 sqft, then at 4" deep you need 320 boardfoot of foam. If it is only 20sqft, then you can do that to 10" thick with a kit like I used.
Have fun, take pictures!
...art


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