said by VioletVenom:
Ok, I stand corrected, there is a DIY foam kit. Someone sent me a link to this.
»www.sprayfoamdirect.com/home-own ··· ications
So, it is available but up front cost is still expensive. Using their estimator, I estimated 240 SF (3x8x10). Came out to $931 for spray foam vs ~$140 for R-19 fiberglass.
There are MANY DIY foam kits. Not sure how you estimated 240 SF as the OP didn't give any dimensions other than
said by doechsli:
The framing is 2x4 so not a huge amount of space.
which would rule out R-19 batts. On the other hand, foam is around R-7 per inch, so the 3.5" thick wall cavity would be R-24.5 if filled with foam versus R-13 with batts.