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Shed Slab Question

532 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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IF you have removed all organic material from the area, and if you have scraped it down to undisturbed soil it will be fine but if you have levelled it with loose dirt it will need to be compacted.
The hill on the right side will be a water problem so I would gig out wider there so you can put a drain line around that corner and catch and direct water to a lower area.

I would also raise a concrete wall in that back corners to counter the dirt that will wash down against the building.

A 7" high wall can be framed up and poured at the same time as the deck.

I think gravel is a good idea and sheet poly under the slab.
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