My driveway in Kanata has alligator cracking everywhere — can it still be resurfaced or do I need a full rebuild?

Alligator cracking is one of the most telling signs of driveway distress, and whether your Kanata driveway can be resurfaced or needs a full rebuild depends on what is happening beneath the surface.

What Alligator Cracking Tells You

Alligator cracking (also called fatigue cracking) forms an interconnected pattern that resembles the skin of an alligator. Unlike simple linear cracks caused by thermal contraction, alligator cracking indicates that the structural layers beneath the surface have failed. The asphalt is flexing beyond its capacity because the granular base or subgrade underneath is no longer providing adequate support.

In Kanata specifically, this is a common issue in subdivisions built during the 1980s and 1990s growth periods (Beaverbrook, Katimavik, Bridlewood) where original driveway construction may not have included sufficient base depth for Ottawa's frost conditions.

When Resurfacing Can Still Work

If the alligator cracking is confined to one section of the driveway (such as where a vehicle's tyres consistently track) and the rest of the surface is in reasonable condition, a contractor can excavate and rebuild just the failed section, then overlay the entire driveway for a uniform appearance. This hybrid approach costs significantly less than a full rebuild while addressing the structural problem.

If the cracking is surface-only (very shallow, with the pavement still feeling firm when you walk on it), it may indicate that only the top layer has fatigued while the base remains sound. This can happen when the original asphalt was too thin or has oxidised severely after years without sealing. In this case, milling the top layer and placing a new overlay can be effective.

When a Full Rebuild Is Necessary

If you walk across the driveway and feel it flexing or bouncing underfoot, especially during spring when the frost is coming out of the ground, the base has failed and an overlay will not last. Water has likely been infiltrating through the cracks for years, washing out the granular fines and creating voids. In Ottawa's climate, this damage compounds every winter as water freezes and expands in those voids.

A full rebuild involves removing all the old asphalt, excavating the failed base material, installing and compacting new granular A and granular B in lifts, and paving with fresh hot-mix asphalt. For a standard Kanata driveway, expect $9,000 to $16,000 depending on the depth of excavation required and whether clay subgrade improvement is needed.

Getting a Proper Assessment

A good contractor will do more than just look at the surface. They should check for base deflection by walking the driveway and pressing on cracked areas, examine the drainage pattern to understand where water has been entering, and may even cut a small test hole to inspect the base material condition and depth. This assessment takes 15 to 30 minutes and should be done before any quote is provided.

Ontario Building Code Considerations

While residential driveways do not require building permits in most Ottawa situations, any work that changes the grading or drainage pattern near your foundation should comply with the Ontario Building Code requirements for lot grading. If your driveway drains toward the house, a rebuild is an opportunity to correct the grade.

Get a professional assessment from contractors listed on Ottawa Driveways to determine whether your Kanata driveway can be saved with resurfacing or needs a complete rebuild.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Homeupgraders
• RenoMotion Inc.
• Prime Property Works
• Callandgone
• Jaiko Cleaning Services