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this may be old news but I had never seen it before, I saw a program the other day on a house build in Australia where they used hollow styrofoam blocks which they poured concrete into. I took them only a couple of days to put up the blocks and pour a very large foundation. Ended up with it soundproofed and insulated at the same time. Seemed like a very inexpensive way to build. I didn't see any reenforcing steel but maybe I missed some parts.
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