Not fire-safe. Burns real well, and produces nasty fumes, almost as bad
as the sheet foam does. That is why both products have to be covered by
sheetrock or solid wood for use in occupied space.
I've heard Frank Gehry lives in an old house in Chicago with no interior
wall sheathing, just studs. Rich Komp's home in Maine has lots of indoor
walls with drywall on one side and bookshelves on the other.
Is making a profit on your investment a consideration? Do you need to
satisfy the building codes in your area? I would just stick to standard
building practices and not try and go cheaper. Your biggest expense will be
labor and if you can provide that yourself you will save a bundle. There
are always day laborers around for when you need some muscle. Fortunately
building materials are a little cheaper right now due to the economy. Take
one room at a time and do it right even if it takes 10 years.
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