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You can’t. Even a slab well reinforced by rebar is going to flex. A cantilever will flex in tension (the top will try to get longer). Concrete is great in compression but sucks in tension. It will crack and crumble and fall apart and you will be sad. You’ll need a thicker slab. In other words, “Yer gonna need a lot more than four inches, bub.” You’ve probably heard that before.
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