Replace or resurface an Ottawa driveway?

If your existing driveway base is stable and damage is limited to the surface layer, resurfacing is a cost-effective option — but if the base has failed, cracking is structural, or drainage is poor, full replacement is the only durable solution in Ottawa's climate.

The decision comes down to what is happening beneath the surface, not just what you can see on top. Ottawa's freeze-thaw cycles are relentless — 50 or more per winter — and they expose every weakness in a driveway's foundation. A resurfacing job (also called an overlay) places 50mm of fresh hot-mix asphalt over your existing surface. It looks great on day one, but if the base beneath is compromised, every crack and movement from below will reflect through the new layer within one to two winters. That is called reflective cracking, and it is one of the most common and frustrating outcomes of an overlay done on a failing driveway.

Signs that resurfacing is appropriate:
The best candidates for resurfacing are driveways where the existing asphalt has surface oxidation, minor cracking (hairline to 5mm wide), and some roughness, but the base is still firm and stable underfoot. If you walk across the driveway and it feels solid — no soft spots, no flex, no areas that move when you step on them — and drainage is working correctly (water runs toward the street, no pooling), resurfacing is a reasonable option. Ottawa driveways in this condition are typically 15 to 25 years old. Resurfacing costs $2,500 to $5,500 for an average Ottawa driveway (40 to 60 square metres), compared to $5,000 to $12,000 for full replacement.

Signs that full replacement is necessary:
Alligator cracking (the interconnected web pattern that looks like reptile scales) is the clearest indicator of base failure — it means the granular base beneath has settled, shifted, or lost its load-bearing capacity, and no surface treatment will fix that. Other red flags include large potholes, sections that flex or sink under vehicle weight, significant heaving from frost or tree roots, and standing water that does not drain. In these cases, overlaying is throwing money away. The only durable solution is full tear-out, base inspection and repair (often adding Granular B and Granular A material to bring base depth up to Ottawa's required 300mm Granular B plus 150mm Granular A minimum), and fresh asphalt in two lifts — binder course (HL8) and surface course (HL3).

Ottawa-Specific Considerations

Ottawa's clay soils (common in Barrhaven, Orleans, Gloucester, and Riverside South) are particularly unforgiving. Clay expands when wet and contracts when dry, and if the original driveway was built without adequate base depth or geotextile fabric, the base has almost certainly migrated and destabilized over time. Driveways in these areas that are more than 20 years old and showing significant cracking almost always need full replacement with proper base reconstruction, not a surface patch.

Drainage is the other critical factor. If your driveway has a low spot, a reverse slope toward the house, or areas where water sits after rain, resurfacing will not fix the problem — it may actually worsen it by changing the surface profile slightly. Drainage issues must be corrected during any driveway project, and correcting them during a resurfacing is far more difficult than during a full replacement where the base is exposed.

Practical Tips

Get a contractor to probe and assess the base before committing to either option. A reputable paving contractor will check for soft spots, measure existing asphalt thickness (ideally 75 to 100mm total for a residential driveway), and evaluate drainage before recommending an approach. Be cautious of any contractor who recommends an overlay without inspecting the base — they may be selling you a short-term fix that fails within two or three Ottawa winters.

If resurfacing is appropriate, ensure the contractor mills or grinds the existing surface edges so the new asphalt ties in flush with garage aprons, sidewalks, and curbs. An overlay that is simply placed on top without edge milling creates a lip that catches snowplow blades and deteriorates rapidly.

Need help finding a driveway contractor to assess your specific situation? Ottawa Driveways can match you with local paving professionals for a free estimate — find contractors through the Ottawa Construction Network at justynrookcontracting.com.