Rebar vs wire mesh for a concrete driveway in New Brunswick — which is better?

For a residential concrete driveway in New Brunswick, rebar (#10M on 18-inch centres) is the better choice — it provides stronger crack control and holds slab sections together more effectively if cracking does occur. Wire mesh is common and far cheaper, but rebar delivers meaningfully better performance for the conditions NB driveways face.

Let's be clear about what reinforcement does in a concrete slab: it does not prevent cracking. Concrete shrinks as it cures and moves with temperature swings, and it will crack regardless of what is inside it. Reinforcement holds the cracked sections together so they do not separate, shift, or become a trip hazard. It also controls how cracks propagate — keeping them tighter and less likely to allow water infiltration.

Wire mesh (typically 6×6 W1.4/W1.4 or 6×6 10/10) is the traditional budget option. It is inexpensive — $3–$5 per 4×8 sheet — and widely used. The problem is installation: mesh must be supported at mid-slab height on wire chairs ($0.25–$0.75 each) throughout the pour. The common practice of laying mesh on the ground and pulling it up during the pour is notoriously unreliable. Studies show this results in mesh sitting near the bottom of the slab in most cases, where it does almost nothing for crack control in the tension zone at the mid-slab height. If your contractor proposes mesh but will not install it on proper chairs, the mesh is largely ineffective.

Rebar (#10M, 3/8-inch diameter) on 16–18 inch centres in both directions is the upgrade worth considering for NB driveways. Rebar is easier to place correctly on chairs and stays in position during the pour. The additional cost for a 500 sq ft driveway is typically $200–$400 in materials and modest extra labour — a reasonable investment given that the driveway itself costs $5,000–$9,000. For a driveway that will see heavy vehicles (trucks, RVs, frequent delivery traffic), rebar is the clear choice.

Fibre reinforcement is a useful supplement but not a replacement for either rebar or mesh. Synthetic (polypropylene) fibres added to the mix reduce plastic shrinkage cracking while the concrete is still setting, but they do not provide the structural crack control that steel reinforcement does after the concrete has hardened.

If budget is the primary concern and your driveway will only see passenger vehicles, properly installed wire mesh on chairs is acceptable. If you want the best long-term performance from your NB driveway, specify rebar.