I watch my buddy P Allen Smith on PBS every once in awhile and I noticed when he spray foamed his "house" (more like a mansion) he used a soy based spray. Not sure how that stuff holds up or the price ($$$?), but you would think it would be a little greener. I have my rim joists just wedged with faced insulation, but plan on just insulating right in front of it with another layer when I build walls down there (build the walls from floor to ceiling). I only use that spray foam when I have to.
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