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gravel under concrete?

is it absolutely required?

are any of you builders?

so, I have a post-frame shed, 12x16. there are posts at 6' on the short sides and every 4' on the long side. posts are set ~18" below grade, on a 2" cap of cement over a few inches of well compacted gravel (holes were all about 27" or so, 2x6 girder runs level at the top (very level all the way around) around base,

ok, so, basically I have ~5.5" to grade from bottom of 2x6 girder to top of board, and the Ive got posts set in concrete, at 24" from the top of that board

so I want to fill that in with concrete, I could put gravel in, say 2" and 3.5" of concrete over that

or just full 5.5" of crete

so I want to fill that in with concrete, I could put gravel in, say 2" and 3.5" of concrete over that

anyway, point is, I think a 5.5" slab, which is on some spongy clay with probably be fine, since its a 12x16' shed. avoid the gravel, the trouble, the labor, time etc with putting a couple inches of gravel in a shed

then, pouring concrete on it

should I make a opic question for this?

ok I made a topic