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Shed Slab Question

528 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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You do not need to go thicker than 4" on the slab. Every driveway across this country that is concrete is formed with 2x4's and unless you plan on parking a Semi on it 4" is plenty thick. A typical concrete 6 bag mix will yield about 4000 pounds per square inch of compressive strength after 28 day's. I doubt you will be placing more than 4000 pounds of anything in a single square inch anywhere on your slab.

Yes, compact, and then compact again. Also that's a big 10-4 on the gravel, compact that too.
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