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I would do one of two things. If I wanted overkill, I would drill a pier in each corner below the frost line, place void forms on the ground between them and pour an integral slab and build the shed on that. I would not have a wooden subfloor, I would just simply place the walls directly on the slab.
Or, more likely, I would simply excavate the 10 x 12 area and pour a 12 inch thick slab directly on it and build the shed on that. I’d make sure the excavation was level, properly compacted and maybe I’d throw some sand on the top of it before pouring the mud but that’s the extent of it.
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