How necessary is gravel under concrete?

replying to Robert Macy, Cynthia O. wrote: I am only replying because others may read it....even though it is a 5-year old question. Using rebar OR WWF (you don't need both) in concrete is not only the right thing to do, but is the smart thing to do. Those who say it is "old" do not know concrete and its ability to crack. Concrete has excellent compressive strength, but poor tensile strength. Code requires certain concrete applications to have either rebar or WWF (Welded Wire Fabric AKA WWMesh). You put rebar rods in footers (on chairs), and you put WWF in slabs (on chairs). This places the rebar / WWF off the ground, and into the concrete where it is doing what it is supposed to do.

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Cynthia O.
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replying to tangerine3, Cynthia O. wrote: Rebar sits in chairs. The newer chairs do not require wire ties around the rebar, and are optional. At least 2 rows of rebar, placed parallel, and equal distance in the concrete footer, are required. WWF is used in slabs, and also sit in chairs to keep it off the ground and at the correct height.

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Cynthia O.

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