So this summer I'm stripping most of the first floor walls down to the studs . Before adding sheet rock, I'm going to insulate. This will be a 30 x 15 foot living room where my wood stove is located. I'm considering spray foam. I figure that minus the windows I'm looking at around 400 square feet. Today I was taking to contractors at a home show. One guy said he'd do it for around $1,200. Another guy said there was a one time home use kit that you could by for closed cell insulation. Anyone have any experience applying spray foam? Any info on the kits (ease of use & cost)?