Rebar vs wire mesh vs fibre
Rebar carries structural load. Mesh and fibres control shrinkage cracking. They solve different problems and are not substitutes for each other.
The full comparison
| Factor | Rebar | Mesh and fibres |
|---|---|---|
| What it does | Carries tensile and structural load | Holds shrinkage cracks tight |
| Structural capacity | Yes, when engineered | No meaningful capacity |
| Placement | On chairs at specified depth | Mesh at mid-depth; fibres throughout the mix |
| Governing spec | ASTM A615 / A706, designed under ACI 318 | Manufacturer data sheet |
| Typical use | Footings, walls, columns, designed slabs | Residential patios, shed pads, sidewalks |
| Cost | Highest | Fibres lowest; mesh in between |
| Common failure | Laid on the subgrade, doing nothing | Expected to replace rebar in a structural slab |
Rebar: When it wins
Anything an engineer designed, anything carrying concentrated load, footings and foundation walls, and driveways that will see loaded trucks.
Mesh and fibres: When it wins
Residential flatwork where the only real concern is shrinkage cracking — patios, walkways, shed pads. Fibres also reduce plastic shrinkage cracking before the slab has any strength.
About these figuresSpacing and cover for rebar are engineer-specified under ACI 318. The commonly quoted 12–18 inches on centre is typical residential practice, not a code requirement.