Crack filler for Ottawa asphalt driveway?

For Ottawa asphalt driveways, hot-pour rubberized crack filler is the only permanent solution for cracks wider than 5mm, while cold-pour crack filler works for smaller cracks but requires annual reapplication due to our extreme freeze-thaw cycles.

Ottawa's brutal winter conditions — with 50+ freeze-thaw cycles and temperatures swinging from -30°C to +35°C — make crack filling absolutely critical maintenance. Water penetrating cracks freezes and expands by 9 percent, widening the crack with every cycle. Left untreated, small cracks become major structural failures within 2-3 winters, requiring expensive asphalt replacement instead of simple crack repair.

Hot-pour rubberized crack filler is the professional-grade solution for cracks wider than 5mm. Applied with a melter and pour pot at 180-200°C, it remains flexible through Ottawa's temperature extremes and bonds directly to the asphalt. Professional application costs $2-5 per linear foot but lasts 3-5 years. For extensive cracking (more than 30 linear feet), this investment prevents water infiltration that would otherwise destroy the base layer beneath your driveway.

Cold-pour crack filler works for hairline cracks up to 5mm wide. Available at hardware stores for $8-15 per tube, it's squeezed directly from the container into clean, dry cracks. While convenient for DIY application, cold-pour filler becomes brittle in Ottawa winters and typically needs reapplication every spring. Clean cracks thoroughly with a wire brush or compressed air before applying — loose debris prevents proper adhesion.

For cracks wider than 10mm, install backer rod (foam rope) first to prevent the filler from sinking too deep and to create a proper seal at the surface. Push backer rod into the crack about 10mm below the surface, then apply filler on top.

Timing is critical — crack filling must be done when temperatures are consistently above 10°C with no rain forecast for 24 hours. Late spring through early fall is ideal. Never attempt crack filling on wet or cold surfaces, as the filler won't bond properly and will fail within weeks.

When to hire a professional: If you have extensive cracking (indicating potential base failure), cracks wider than 15mm, or alligator cracking patterns, the driveway may need structural repair or replacement rather than crack filling. A paving contractor can assess whether crack filling will be effective or if you're better investing in resurfacing or replacement.

Need help finding a driveway contractor for extensive crack repair? Ottawa Driveways can match you with local paving professionals who understand Ottawa's challenging climate conditions.