Best value for building green?
I have a limited budget but would like to build my new home as green as possible but need to know where the money is best spent.
I live in climate zone 5 (southern idaho) and will be building ranch style with full basement.
my site is pretty awesome, south facing and no trees to block any passive solar gain.
-exterior rigid insulation: for my climate zone it would need 1.5 inches , is this worth it? I have gotten answers from local insulation contractors that are all over the place , would it be better to spend more on closed cell foam ? then would not have to spend the money on changing the window frames.
-insulating the slab: I was planing on doing 2inch of XPS under the entire slab, but is doing the outside edge just as effective ?
-insulating the exterior or interior of the basement wall? I would love to avoid having to refinish the rigid foam. has anyone done rigid form on the exterior but stopped just short of the grade level ? lets say 6 inches
-Air sealing: planing on Flash and batt method, but would using using ecoseal or owens corning energy complete be more cost effective ?
-what should my end goal be for insulation be for walls and attic? does the 10/20/40/60 rule sound good?
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