Quote:
Originally Posted by EastCoastCB
I'm using rockwool in some walls. Interior walls especially since its completely fire proof and thus could help if such a calamity strikes. Its hydrophobic as well. Good stuff for certain applications.
Poly board will be used in the exterior walls and ceilings. I *MAY* do a bit of spray foaming, but I'm trying to keep this simple and cost effective.
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"styrofoam" is about the cheapest foam board out there.
Any other foam board is more expensive.
Styrofoam and rock wool have almost identical R values per inch.
I was at Lowes comparing prices and the rock wool is 1/2 as expensive as styrofoam sheets per sq ft.