Sprayed-foam insulation

I've mentioned in the past that ICF might be one of the methods we considered for building the shell of a structure; but costs to use that method are fairly high, as well as it not always being very easy for the inexperienced owner-builder to use. One of the benefits of the ICF method is the high R-value you get compared to most other materials. One of the ways to bring up the R-value on other construction is to use spray-in insulation, Icynene being one of the more widely known. But... Icynene costs around $4+ a square foot to have done; you can't really do it yourself too easily due to the tooling and experience necessary to do the job. At that cost, I've seen estimates for a 2,500 sq.ft. home costing well over $20,000 for walls and roof. That's a LOT of money for just insulation.

Well, maybe there's a way around that. Fomo Foam sells DIY spray-in insulation kits that could cut the cost significantly for an owner builder. Fomo Foam costs just over $1 per square foot of wall. Compare that to fiberglass batting which can cost $.50 per square foot per inch, and cellulose which costs a little over $1 per square foot as well. Looking at it that way, using the DIY spray in foam looks to be by far the best. You'll get as good as, if not better, insulative qualities than cellulose, none of the slightly hazardous problems of installing fiberglass, and have the sealing qualities of foam. Sounds like Fomo Foam might be doing some more research on.