What the surface is actually telling you
The joints between your pavers have grown wide. Some are a centimetre across where they were a few millimetres when the driveway was new. A few pavers have tipped slightly, so there is a lip you catch with the snowblower. Others have settled in a shallow bowl near the apron, where water pools after rain. The pavers themselves are almost certainly fine. Concrete pavers made in the 1990s and early 2000s are dense, well-cured units that outlast the material around them by decades. What has failed is the system holding them in place.
Joint sand is the first thing to go. It sits in narrow gaps between pavers, and its job is to lock each unit against its neighbours so the surface behaves as a single rigid plane. When that sand washes or migrates away, the interlock is gone in the literal sense: each paver can now rock, tip and shift independently. The surface you are standing on has quietly stopped being a pavement and become a collection of loose stones.
Why older driveways lose sand faster than newer ones
Installation standards for residential interlock in Toronto shifted noticeably in the mid-2000s, partly because contractors and suppliers had accumulated enough callbacks to understand what was going wrong. Two things were routinely skipped on driveways installed through the 1990s and into the early 2000s: a proper edge restraint system along the perimeter, and polymeric sand in the joints.
Edge restraint is a spiked plastic or aluminium channel that runs along every free edge of the paved area, pinned into the granular base with long spikes. Without it, the border course of pavers has nothing holding it laterally. Each freeze-thaw cycle, each car turning onto the apron, each heavy rain nudges the perimeter outward by a fraction of a millimetre. Over twenty-five years those fractions add up to a visible gap. Once the border moves, the pavers behind it lose their lateral support and the whole field begins to spread.
Regular kiln-dried joint sand, which was the standard fill through that era, is loose granular material. It washes out in heavy rain, it gets blown out by pressure washing, and it migrates downward through the bedding layer if the base has any voids. Joint washout on a driveway this age is not a sign of neglect. It is simply what happens to that generation of installation over enough Toronto winters.
- No edge restraint along the apron or side borders
- Kiln-dried sand rather than polymeric sand in the joints
- Bedding sand laid thicker than recommended, giving more room for settlement
- Geotextile omitted between the granular base and the sub-grade
- Joints wider than 3 mm, which hold less sand and lose it more readily
How freeze-thaw turns a slow leak into a fast one
Toronto sits in a climate where the temperature crosses zero degrees Celsius dozens of times between November and April. Each crossing is a freeze-thaw cycle, and each one does a small amount of work on any granular material that holds moisture. Water expands roughly nine percent when it freezes. In a joint that is already partially empty, that expansion pushes the neighbouring pavers apart slightly. When the ice melts, the pavers do not always return to exactly where they were. The joint is now fractionally wider, and the next rainfall carries a little more sand out of it.
This is why a driveway that looked acceptable in 2018 can look noticeably worse by 2026. The deterioration is not linear. Once joints reach a certain width, rain washes sand out faster, pavers have more room to rock, and rocking pavers pump the remaining bedding sand out from underneath them. The mechanism behind interlock settlement is self-reinforcing once it passes a threshold.
Reading the surface to find the true extent
Before any repair makes sense, the extent of the problem needs to be mapped. A string line stretched across the driveway at paver height will show you every area that has settled more than about 10 mm. Wide joints alone, without settlement, suggest the sand has migrated but the bedding layer is still largely intact. Settlement on top of wide joints usually means the bedding sand has moved too, and the repair scope is larger.
Pay particular attention to the perimeter. If the border course has spread outward, the gap between the last paver and the edge of the concrete apron or the lawn will be visible. That gap is the clearest sign that edge restraint was never installed. A missing edge restraint is not a cosmetic issue. It is the root cause, and any repair that does not address it will repeat the same failure within a few years.
Also look at where water goes after rain. A driveway that drains toward the garage door, or that pools in the centre, has a grading problem layered on top of the joint problem. Both need to be corrected at the same time, because water sitting on the surface is the engine driving the sand loss. The fall and grade of the surface should be confirmed before the pavers go back down.
- String line across the surface: look for dips greater than 10 mm
- Joint width: anything consistently over 5 mm has lost significant sand
- Border course position: measure the gap at the apron and at the sides
- Pooling locations: note where water sits after a 30-minute rain
- Rocking pavers: walk the surface and feel for units that tip underfoot
What a proper joint repair actually involves
A joint repair on a driveway this age is rarely just a matter of sweeping in new sand. If the joints are wide and the surface has settled, the pavers need to come up. That is not a reason to be alarmed. Concrete pavers are designed to be lifted and relaid, and a careful lift preserves nearly all of them for reuse. The bedding sand underneath is screeded back to the correct level and correct fall, the base is inspected for voids or washout, and edge restraint is installed along every free edge before the pavers go back.
Once the pavers are relaid and compacted, polymeric sand goes into the joints. Polymeric sand contains a binder that activates with water and sets firm. It resists washout from rain, resists the displacement that comes from freeze-thaw cycling, and is significantly less hospitable to weed germination than kiln-dried sand. It is not permanent, it will need to be refreshed eventually, but its lifespan in a Toronto climate is measured in years rather than months.
If the base itself has voids or the fines have washed out through a missing geotextile, that needs to be addressed before anything else. A granular base repair adds scope and cost, but skipping it means the new bedding layer will settle into the same voids within a season or two. The honest answer is that the base condition cannot be confirmed until the pavers are up. A contractor who quotes a fixed price without lifting a test area is guessing.
For a driveway where only a section near the apron has settled and the rest of the surface is still level, a partial relay is sometimes the right call. The affected area comes up, the base and bedding are corrected, edge restraint is added at the apron, and the section is relaid and re-sanded. The re-sanding should extend across the whole driveway, not just the repaired section, so the joint condition is uniform.
- Lift and stack pavers from the affected area, keeping soldier and border courses separate
- Inspect and repair the granular base, adding material to any voids
- Install spike edging along every free perimeter edge
- Screed bedding sand to the correct depth and fall
- Relay pavers, maintaining original pattern and joint spacing
- Compact with a plate compactor fitted with a rubber pad
- Fill joints with polymeric sand in two passes, compact between passes
- Activate polymeric sand with a fine mist and allow to cure
When to call, and when to leave it
A settled area smaller than about a square metre, with no pooling water and no trip hazard, is rarely worth a call-out on its own. Sweeping some kiln-dried sand into the joints as a temporary measure costs almost nothing and buys time until the repair scope is large enough to be worth mobilising for. Toronto Interlock Repair, like most contractors in this trade, will tell you plainly if a surface has years left in it.
The situations that do warrant a call are: a trip hazard at the apron or along a walking path, water pooling within two metres of the garage door or a basement window, joints so empty that pavers rock underfoot across a large area, or a border course that has visibly spread away from the apron. Any of those conditions will worsen through the next freeze-thaw season, and the repair scope tends to grow with each winter that passes.
If you are unsure whether the base is involved, the sunken driveway page walks through the signs that distinguish a bedding-layer problem from a base problem. The distinction matters because the repair cost is different. Understanding what you are looking at before the first call makes the conversation with any contractor more productive.
For a broader picture of what drives repair pricing on a driveway this age, the re-levelling cost page sets out the variables: area, base condition, edge restraint installation, and whether the existing pavers can be fully reused. Ranges vary enough that a single number without a site visit is not useful to anyone.
The joints on a 1990s Toronto driveway did not fail because the pavers were poor quality or because the surface was neglected. They failed because the installation standard of that era left out two things that are now considered basic: edge restraint and a sand that resists washout. Fixing those two omissions, along with whatever the base needs, is what a repair that lasts actually looks like. The joint repair overview covers the full range of conditions this work addresses, from simple re-sanding to a full lift and relay.