How do I reseat shifted pavers in my Ottawa driveway?

Resetting shifted interlock pavers is a manageable DIY project if only a small area is affected. The key is understanding why they shifted in the first place and addressing the underlying cause, not just the surface symptoms.

Start by assessing the extent of the problem. If only a few pavers have shifted due to settling or minor base erosion, you can likely handle this yourself. However, if large sections have moved, heaved, or sunk significantly, the issue is likely deeper base failure that requires professional excavation and rebuilding. In Ottawa's freeze-thaw climate, widespread paver movement often indicates inadequate base depth or poor drainage allowing water to penetrate and destabilize the foundation.

For minor resetting, you'll need basic tools: flat pry bars or large screwdrivers, a rubber mallet, coarse sand or stone dust for bedding, a plate compactor (rentable for about $60/day), a push broom, and replacement polymeric sand. Begin by carefully lifting the affected pavers using the pry bars - work from the edges and avoid chipping. Clean any debris from the bedding layer beneath and inspect for obvious problems like washout, root intrusion, or ant colonies that may have undermined the sand bed.

Add fresh bedding sand to restore the proper level - typically 25-40mm of coarse concrete sand or stone dust, screeded level with a straight board. The bedding layer should be slightly higher than final grade since it will compact when you relay the pavers. Compact this bedding layer lightly with a hand tamper, then relay the pavers following the existing pattern. Tap each paver into place with the rubber mallet, checking that they're level with surrounding pavers and maintaining consistent joint spacing of 2-3mm.

Ottawa's clay soils and freeze-thaw cycles make proper compaction critical. Once all pavers are reset, run the plate compactor over the entire area 2-3 times to ensure they're properly seated. The compactor will vibrate the pavers into the bedding sand and lock them together. Sweep polymeric sand into all joints, ensuring they're completely filled, then compact again lightly and sweep off excess sand from the surface.

Address the root cause to prevent recurrence. Check that water drains away from the reset area - standing water is the enemy of interlock stability in Ottawa. If the pavers shifted due to edge restraint failure, you may need to reinstall or add plastic or aluminum edging along the perimeter. Tree roots, poor drainage, or inadequate base depth (less than 450mm total in Ottawa) will cause repeated shifting that simple resetting cannot fix.

When to hire a professional: If more than 10-15 square feet of pavers have shifted, if there's obvious base settlement or heaving, if the problem recurs after resetting, or if you discover significant drainage issues or root damage during the work. Large-scale paver movement in Ottawa typically indicates base failure that requires excavation, additional granular material, and proper recompaction - work that requires heavy equipment and expertise.

Need help finding a driveway contractor for more extensive interlock repairs? Ottawa Driveways can match you with experienced local professionals who understand Ottawa's challenging soil and climate conditions.