How should rebar be spaced on center?

Question

how should rebar be spaced on center? Is There a diffrence on the size of rebar.

Answer 1

depending on the size of the rebar, my recollections of seeing it on jobsites would be 16" on center for anything 1/2"

or above. the smaller the rebar, the closer together i would space it, 3/8" would be 12",  anything smaller- switch over to wire mesh.