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Just to clarify, polyiso is not (I believe) the normal foam board you buy at your local home improvment store. The normal foam board is called polystyrene and is cheaper and isn't quite as good at R-4 per inch of thickness. Polyiso (full name is polyisocyanurate) is a little different and as mentioned is R-7 per inch of thickness.
Also, cellulose is not a foam. It is a mixture of mostly recycled paper.
I'll be getting into the house at the end of the month assuming no hang ups. I'll be sure to post any progress here.
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