Rebar grid for concrete slabs. Standard spacing 18 inches on center both directions. #4 (1/2 inch) rebar common for residential slabs, #3 (3/8 inch) for light duty. Overlap bars 18-24 inches at joints. Place rebar in center third of slab depth on chairs.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
#3 (3/8 inch) light duty, #4 (1/2 inch) standard residential, #5 (5/8 inch) driveways.
Typically 18 inches on center grid pattern for 4 inch slabs, 12 inches for heavy loads.
Rebar stronger for driveways and foundations. Wire mesh adequate for light slabs and sidewalks.