Rebar Sizing Guide
- 4" slab: #3 bars at 18" O.C. or welded wire mesh 6x6-W1.4xW1.4
- 6" slab: #4 bars at 12" O.C. both ways
- 8" wall: #4 bars at 12" O.C. vertical, #4 at 16" O.C. horizontal
- Min cover: 3" for earth contact, 1.5" for exposed, 0.75" for interior