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Side note: we had one of our (just finished unoccupied 2 story house) slabs get undermined by a freak flash flood. It cleared out nearly 8 feet under the corner of two exterior walls. The slab was 4: with #3 bars on 18" centers each way. We could measure no deflection on the walls that met at that corner, and I even stood under it just, cuz.
I wouldn't have believed it if I hadn't seen it, but then again all the old-timers always told me we were overbuilding these days.
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David
1972 911T/S MFI Survivor
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