Alternatives to foam under slab or no slab?
Are there any alternatives to foam under a slab that might be "cost effective". I realise that CE is a very loaded term, so don't get bogged down in that term.
Obviously, I am not interested in VIP's. But how about the cost and performance of Perlite? Are there other alternitives?
I am looking at a Passive House in a 5, maybe 6, climate zone.
XPS may be available to me at a reduced cost because my wife works for a large company that makes the stuff. Am I wasting my time looking at alternative insulation products if I can get XPS at a discount?
What about not using a slab at all? Would it make more sense to build on pillers and insulate the floor? Has anyone tried that? I don't think I have seen this approach in any of the PH books out there.
Posted Aug 23, 2012 9:44 AM ET
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Buying a house and want to make it super efficient. I have some concerns about the attic. Can you help?