Can I install interlock pavers over my existing concrete driveway pad in Kanata to update the look?

Installing interlock pavers over an existing concrete driveway is generally not recommended and will likely fail within 2-3 Ottawa winters. The concrete pad lacks the proper base depth and drainage characteristics that interlock systems require to handle freeze-thaw cycling and frost heaving.

Why This Approach Fails in Ottawa's Climate

Interlock pavers need a minimum 450mm of properly compacted granular base in Ottawa due to our 1.2-1.5 metre frost depth. Your existing concrete pad sits on whatever base was installed decades ago — likely minimal by today's standards. When you place bedding sand and pavers over concrete, you create a rigid surface over a rigid surface with no ability to flex during freeze-thaw cycles.

Ottawa's 50+ freeze-thaw cycles per winter will cause the concrete beneath to crack and heave, telegraphing every movement up through the pavers above. The bedding sand will wash out through joints, pavers will settle unevenly, and you'll have a maintenance nightmare within the first winter. The concrete pad also prevents proper drainage — water will pool between the concrete and pavers, freeze, and push the pavers upward.

The Right Approach for Kanata

Remove the existing concrete completely and build a proper interlock base system. This means excavating 600-750mm deep (depending on your specific soil conditions — Kanata has variable soil from clay in the east to sandy soils near the Canadian Shield in the west), installing geotextile fabric if you have clay subgrade, then building up with 300mm of compacted Granular B sub-base and 150mm of compacted Granular A base.

Cost Reality Check

A proper interlock installation in Kanata runs $12-20 per square foot including concrete removal and disposal. For an average driveway (50 square metres), expect $6,500-10,500. Yes, it's significantly more than laying pavers over concrete, but it's the only approach that will survive Ottawa winters. The "cheap" overlay approach will cost you twice when it fails and needs complete reconstruction.

Alternative Solutions

If budget is the primary concern, consider concrete resurfacing with stamped or coloured overlays ($8-12 per square foot) or decorative concrete staining. These work with your existing base and provide the updated appearance you're seeking. You could also focus interlock installation on high-impact areas like the front entrance while keeping the main driveway as concrete.

When to Hire a Pro

Concrete removal and interlock installation requires excavation equipment, proper base compaction with vibratory rollers, and precise grading for drainage. This is definitely professional territory — improper base preparation is the number one cause of interlock failure in Ottawa.

Need help finding a qualified paving contractor? Ottawa Driveways can match you with local interlock specialists who understand Kanata's soil conditions and Ottawa's climate requirements.