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Wouldn't a floating slab work for that???
Hell around here everyone just puts em on a bed of sand and lets em float. I did my old garage 24 by 32 like that sitting in a low wet spot. Spread 2 loads of sand in the hole and used a thicer sides like 16 " by a foot something I got in a book somewhere and plenty of rebar and mesh. Not a single real separated crack since 1988 and it was poured under horrible half ass conditions. With no help but a bottle of Vodka. Its held up to -42F and Northern NY's frozen swamp conditions. Personally I now prefer just doing a pole barn with p treated posts as its lots cheaper and easier for something like a shed. Of course digger around here is not a shove sort of thing, big backhoe only.
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