I would like some input on what some of you like to use in your concrete. I use #3 rebar on most all my 4" slab work on 2'to 3'o.c. The inspectors here like to use wire mesh and fiber. In my experience, it is useless. I have tore out numerous slabs containing the mesh and fiber because of settlement and cracking. I know concrete is going to crack, but the rebar I have used has stopped the settltment and stopped the cracks from widening or shifting to where one side is higher than the other.