Small Slab advice


Hi, getting some conflicting advice from books.
It's on how deep to pour a proper small slab that later will gain a brick BBQ.
Ground is grey clay, we planned a sand pit to even it, then a 4 inch depth of poured cement, 4x5 size, raised so it's about 2 inches above ground (2 inches below). Area is Norfolk VA. Deep enough?
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Might last 30 years, maybe 50. More with rebar. Consider some sort of finish that will make hamburger grease spills easy to clean.
Joe
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