There's a gap forming between our asphalt driveway and the garage floor slab in Orleans - how should this be fixed?

The gap between your driveway and garage floor is one of the most common issues Ottawa homeowners deal with, and it is almost entirely caused by our extreme climate.

Why the Gap Forms

Your garage sits on a concrete foundation that extends below the frost line, roughly 1.2 to 1.5 metres deep in Ottawa. It barely moves. Your asphalt driveway, however, sits on a granular base that is subject to frost heave every winter. In Orleans, where clay-heavy soils are widespread, the ground can heave 2 to 5 centimetres or more during deep freezes, pushing the driveway up, then settle back down in spring, often not quite to its original position. Over several freeze-thaw seasons, the driveway pulls away from the fixed garage slab, creating a widening gap. Water then enters the gap, freezes, and makes it worse each year.

Problems a Gap Causes

Beyond being unsightly, the gap allows water to flow underneath the garage apron and erode the base material. This accelerates settling and can eventually undermine the driveway near the garage, creating a depression that pools water right where you do not want it. In winter, water in the gap freezes into a ridge of ice that can trip people and make shovelling difficult.

Repair Options

For gaps up to about 15mm wide, flexible asphalt crack sealant (hot-applied or cold-pour) works well. This is the same material used for driveway crack filling and costs $100 to $250 for a professional application of the garage joint. The sealant stays flexible through Ottawa's temperature range and accommodates seasonal movement.

For gaps between 15mm and 40mm, a backer rod inserted into the gap followed by a polyurethane or asphalt sealant is the standard approach. The backer rod prevents the sealant from sinking too deep and ensures it flexes properly. This repair runs $150 to $400 depending on the gap length and depth.

For gaps wider than 40mm or where the driveway has settled significantly, you may need the asphalt near the garage cut out and re-laid at the correct height. Some contractors install a flexible rubber transition strip designed for this exact joint, which provides a clean look and accommodates movement. A cut-and-patch repair at the garage joint typically costs $500 to $1,500.

What Not to Do

Do not fill the gap with rigid concrete or mortar. It will crack within one freeze-thaw cycle because it cannot flex. Do not use expanding foam, which deteriorates in UV light and provides no structural bridging. And avoid piling extra asphalt cold-patch into the gap as a makeshift fix. It will not bond properly and will break loose within months.

Long-Term Prevention

When a driveway is originally paved, the best practice is to leave a deliberate expansion joint at the garage interface, filled with flexible sealant from day one. If your driveway is being replaced or resurfaced, make sure your contractor plans for this joint.

Connect with local paving and repair contractors through Ottawa Driveways who are experienced with the specific soil and frost conditions in Orleans.

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

• Justyn Rook Contracting
• JC Carpentry
• Eastern Residential Solution
• The Next Reno
• Titley Construction