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Old 12-09-2010, 06:07 PM   #16
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Dick, I believe (from a previous thread) that he's just using this for a frost wall with balanced fill on both sides. I agree though that the rebar design tying the two wythes together would be complicated, especially since they're not encased entirely in concrete.

BTW, keep pushing block foundations, I'm trying to hold off on buying poured wall forms as long as I can.........
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Old 12-09-2010, 08:06 PM   #17
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Dick and Jo: Yes, this would be just a foundation wall, 4' high, on top of which will be a normal house, 2-story, 50 psf snow load, etc. Back-filled and compacted on both sides. I would be using the 40 psi XPS, unless I find out that a higher psi is needed. It SEEMED to me that ThermoMass has a pretty good idea here, and from their web site, fwiw, they build these of various sizes all over the show. I have no idea about wythe-to-wythe load transfers, etc, so I was rather counting on them to have worked all that out. Their pins are a different animal from rebar, but I did not see why #5 rebar would fail. But then, I am not an engineer. I can get ARXX blocks w/ a 10" core, too, and that would mean flaring each side one inch in the top course (my own form) to catch both 2x4 walls fully. With 2.5" of the 2x4 bearing on the solid 10" wall, I can not see how I could get into trouble. So, maybe just pouring a 10" ARXX wall with a tweaked top, or just say (insert whatever) and pour a solid 12" wall is the way to go. A 12" wall is 50% more spendy than the "normal" 8 inch, but that is life. Put a bunch of XPS on the outside, flash it, and sleep at night. Thanks for the thoughts. john
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