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Shed Slab Question

530 Views 5 Replies 5 Participants Last post by  Missouri Bound
I want to build a 10x12 shed like a house for a mini-gym (2x6 framing, insulated, gypsum, flooring, etc).

Is a 4" (3.5" actual) at 3000 psi with 3/8 rebar good enough?
Do I need some compacted gravel at the bottom? Or thicker 6" (5.5" actual) better?

I'm in California, my dirt quality is here:

The location photo is attached below.


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Yes, I already planned for more excavation around that hill and a retaining wall so there is enough space to have a brick walkway. My focus today was primarily the concrete base. Thanks for the input!
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