How do I lift a heaved Ottawa concrete driveway section?

Lifting a heaved concrete driveway section requires professional concrete lifting techniques — this is not a DIY repair. The heaving is caused by Ottawa's deep frost penetration (1.2-1.5 metres) pushing up sections where the base wasn't properly prepared below the frost line, or where water has infiltrated and frozen beneath the slab.

Professional concrete lifting methods include mudjacking (pumping a cement-sand slurry under the slab through drilled holes) or polyurethane foam injection (injecting expanding foam to lift and stabilize the concrete). Both techniques raise the sunken areas to match the surrounding surface level. Mudjacking costs $300-800 per affected section, while polyurethane injection runs $500-1,200 but cures faster and provides better long-term stability. The contractor drills 1-2 inch holes through the concrete, injects material underneath to lift the slab, then patches the holes.

Ottawa's clay soils and freeze-thaw cycles make concrete heaving particularly common in areas like Barrhaven, Orleans, Gloucester, and Riverside South where expansive clay subgrade wasn't properly addressed during original construction. When clay gets saturated and freezes, it expands dramatically, pushing concrete sections upward. When it thaws, the clay contracts but the concrete often remains displaced, creating permanent heaving and trip hazards.

Temporary solutions include grinding down the raised edges with a concrete grinder to eliminate trip hazards, but this doesn't address the underlying cause. The heaved section will likely continue moving with future freeze-thaw cycles. Some homeowners try to break out and re-pour individual sections, but this rarely works long-term because the same base conditions that caused the original heaving remain unchanged.

Prevention for future sections involves ensuring proper drainage around the driveway perimeter, extending downspouts away from the concrete, and maintaining good surface drainage to prevent water infiltration. Sealing concrete cracks promptly prevents water from reaching the subgrade where it can freeze and cause additional heaving.

When the heaving is severe (more than 50mm height difference) or affects large areas, full removal and replacement with proper base preparation may be more cost-effective than lifting. This involves excavating below the frost line, installing proper granular base, and pouring new concrete with control joints every 3 metres to manage future movement.

Professional assessment is essential — a concrete contractor can determine whether lifting will provide a durable solution or if the base conditions require more extensive repair. They'll also identify whether the heaving is from frost action, tree roots, or settling, which affects the repair approach.

Need help finding a concrete lifting specialist? Ottawa Driveways can match you with local contractors experienced in Ottawa's challenging soil and climate conditions.