Which latex crack filler holds up over a full Ottawa winter?

For Ottawa's extreme freeze-thaw conditions, hot-pour rubberized crack filler applied by professionals significantly outperforms any latex crack filler. Latex-based products, while convenient for DIY application, become brittle in Ottawa's -25°C to -30°C winter temperatures and typically fail within one freeze-thaw season.

Hot-pour rubberized crack sealants remain flexible through Ottawa's 50+ annual freeze-thaw cycles because they're specifically engineered for extreme temperature swings. Professional contractors use products like Deery American or Crafco that stay pliable from -40°C to +80°C. These are heated to 180°C-200°C and applied with a melter and pour pot, creating a permanent seal that moves with the asphalt as it expands and contracts.

Latex crack fillers struggle in Ottawa's climate because they cure to a relatively rigid state. When temperatures plummet below -20°C, latex becomes glass-like and cracks under the stress of asphalt movement. Even premium latex products marketed as "flexible" typically fail by February or March, leaving cracks wider than before as the failed filler breaks away from the crack walls.

If you must use a DIY latex product, apply it in late spring (May-June) rather than fall, giving it maximum time to cure before winter stress. Clean cracks thoroughly, use a wire brush to remove loose material, and apply when temperatures are above 15°C with no rain forecast for 24 hours. For cracks wider than 10mm, install foam backer rod first to prevent the filler from sinking into the crack.

The most cost-effective approach is having a professional apply hot-pour crack filler ($2-5 per linear foot) followed by sealcoating the entire driveway. Hot-pour crack filling lasts 3-5 years in Ottawa, while latex products need annual reapplication. The labour cost of repeatedly cleaning and refilling the same cracks with latex products quickly exceeds the one-time cost of professional hot-pour application.

When to hire a pro: Any crack wider than 5mm, multiple cracks across the driveway, or cracks that have previously been filled and failed. Professional crack filling includes proper crack preparation, routing (widening the crack to create better adhesion), and application at the correct temperature for optimal penetration and adhesion.