Quote:
Originally Posted by Daox
You can also do as AC hacker has done and use rigid foam, and just use expanding foam in a can (great stuff) around the rigid foam. You cut the foam to fit between the joists and use the expanding foam around the edges to seal it up. WAY cheaper and air seals just as well, and you get the same R value per inch if you use rigid polyiso. He has a thread somewhere about it, I think its about his kitchen remodel?
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I don't think it is much cheaper, let alone WAY cheaper. Rigid foam is nearly $20 for 2x8' by 2" boards around here and there is too much waste. Then add in several small cans of foam to seal the edges... In AC's thread he said he would use my technique next time.