How to Make Your Interlock Last Longer (2026 GTA Maintenance Guide)

The single biggest factor in how long interlocking pavers last isn't the paver brand — it's whether the joints get refreshed. Properly maintained interlock in the GTA typically reaches 30–40+ years; neglected interlock starts needing major repair by year 18–22. The maintenance itself is genuinely light: an annual rinse, polymeric sand refreshed every 4–6 years, a sealer on roughly the same cycle, and swapping rock salt for sand in winter. None of it requires special skill, and over a decade it costs less than most homeowners spend on a single kitchen appliance. This guide walks through the real GTA maintenance schedule, what each service actually costs in 2026, which sealers are worth paying for, and the handful of mistakes — mostly involving salt and pressure washers — that quietly cut a driveway's life in half.

Quick answer — what actually extends interlock lifespan

Six things determine whether your interlocking driveway or patio reaches 40 years or needs major repair at 18: refreshing the polymeric sand every 4–6 years, resealing on roughly that same cycle, an annual rinse and visual inspection, using sand instead of rock salt in winter, addressing weeds and low spots as soon as they appear, and never sealing within the first 60–90 days after installation. That's the entire program.

• Annually: garden-hose rinse or gentle pressure wash, pull any weeds, walk the surface for low spots — free (DIY) or $200–$400 if you hire it out.
• Every 4–6 years: full re-sand of every joint with fresh polymeric sand, surface clean, and reseal — $1,500–$3,000 for a typical 700 sq ft driveway.
• Every 10–15 years: spot-check edge restraint and swap any chipped or stained individual pavers — $400–$1,200.
• All winter: sand for traction, not rock salt; rubber-edged shovels or a snow blower, not a steel blade dragged across the surface.

Skip all of it and the driveway still won't collapse — but the joint sand washes out, weeds and water move in below the surface, and what would have been a $1,500 maintenance visit turns into a section that needs to be pulled up, re-based, and relaid at $25–$55 per square foot installed.

Why Ontario interlock needs maintenance at all

The paver itself is close to permanent — concrete pavers from Techo-Bloc, Unilock, or Permacon simply don't wear out under normal residential use. What actually ages is everything around the paver: the polymeric sand locking the joints together, the sealer protecting the surface, and the base underneath both of them. Maintenance exists to keep those three systems intact, not to protect the paver itself.

The GTA gives those systems a genuinely hard year: roughly 40–60 freeze-thaw cycles per winter, each one putting mechanical stress on anything holding water, including a joint that's lost its sand. Add five months of road salt exposure (November through March) and snow-clearing equipment scraping the surface every storm, and it's clear a driveway here ages very differently than one in a milder climate.

Skipping maintenance doesn't cause sudden failure — it causes compounding failure. Polymeric sand erodes gradually, typically losing 20–30% of its volume by year 3–4 and 30–50% by year 5–7 if it's never refreshed. As sand disappears, water gets under the pavers instead of staying locked out, weeds root in the gaps, and individual pavers start to shift. None of that is dramatic in any single year, which is exactly why it's so easy to ignore until it's expensive.

The interlock maintenance schedule, in order

Here is the actual order of operations, from the day your driveway or patio is installed through decades of ownership.

Day 1 to 90: do nothing to the surface

Newly installed pavers often show a light white haze called efflorescence over the first 6–12 months — a normal mineral deposit, not a defect, that fades on its own. Don't seal during this window; sealing over efflorescence traps it under the coating instead of letting it release.

60–90 days post-install: first seal coat

Once the surface has had time to release moisture, apply the first seal coat. This is the step homeowners most often forget, because there's no obvious sign it's needed yet — the driveway still looks brand new. Sealing this early protects the paver colour and the polymeric sand from day one instead of leaving them unprotected for years.

Annually: rinse, inspect, pull weeds

A garden-hose rinse or gentle pressure wash, a quick walk of the surface looking for low spots or shifted pavers, and pulling any weeds. This takes under an hour and is the highest-leverage task on this list — it catches small problems before they spread.

Every 4–6 years: full re-sand and reseal

This is the core maintenance cycle that determines whether your interlock reaches 35–40 years or needs major work by year 20. It has five steps: clean the surface, remove degraded polymeric sand and any weed growth from the joints, sweep in fresh polymeric sand and activate it, apply a fresh sealer coat, and do a final walk-through checking edge restraint and any pavers that need replacing. See our full breakdown of how interlocking driveways age year by year for what this cycle looks like at each stage.

Every 10–15 years: edge restraint and spot repairs

Edge restraint — the anchored strip that keeps the outer row of pavers from spreading outward — occasionally needs re-anchoring after a decade-plus of frost heave cycling. This is also the natural point to swap out pavers that have chipped from snow plow contact or picked up a permanent stain.

As needed: re-leveling

If a section settles — usually poor drainage or a tree root shifting the base below — lift the affected pavers, correct the base, and reset them. Caught early, this is a localized fix measured in hours, not days.

What maintenance costs — and what skipping it costs

Here's the honest 2026 cost picture for a typical GTA residential driveway or patio, based on our own service pricing and installations across the region:

Now the other side of the ledger. A homeowner who does none of this doesn't pay nothing — they defer the cost and let it grow. Once joint sand is gone for long enough that water has been moving under the base for a few winters, you're no longer looking at a $1,500–$3,000 maintenance visit. You're looking at excavating and re-laying that section from scratch at full installed driveway pricing — $25 to $55 per square foot in the GTA in 2026. On even a modest 200 sq ft section, that's the difference between a $2,000 maintenance cycle and a $5,000–$11,000 rebuild.

Sealers compared — penetrating, film-forming, and no seal

Not all interlock sealers do the same job, and picking the wrong one for your priorities is a common source of disappointment. Here's how the two main categories compare, plus what happens if you skip sealing entirely.

Penetrating sealers are what we install on most GTA driveways because they last longer between applications and don't change how the surface feels underfoot. Film-forming acrylics look genuinely striking — the "wet look" that makes a paver colour pop — but that surface film wears from traffic faster, which is why it needs reapplication every 2–3 years instead of 4–6. Neither is wrong; it's a look-versus-frequency tradeoff, and we'll give you our honest recommendation based on your paver and how you use the space.

Sealing isn't mandatory — a driveway functions fine unsealed. But skipping it means faster colour fade, less stain resistance (oil and grease soak straight into unsealed pavers instead of sitting on top), and polymeric sand that isn't locked in place as well, so you'll be topping up sand more often to compensate.

Winter care — salt, snow removal, and plowing

What you do in the driveway's first Ontario winter and every one after it matters more than almost anything else on this list, because winter is when interlock takes its worst abuse.

Sand, not rock salt

Standard sodium chloride (rock salt) is the most common — and most damaging — winter traction product used in the GTA. It causes surface efflorescence, accelerates freeze-thaw spalling because salt-saturated water expands more violently than fresh water when it freezes, and slowly degrades both the paver surface and the polymeric joint sand. Use sand for traction whenever you can. If you genuinely need a de-icer, calcium magnesium acetate (CMA) or calcium chloride blends are significantly gentler on pavers and joints while still being effective.

The right shovel and plow

Use a rubber-edged shovel blade or a snow blower rather than a steel-edged shovel dragged directly across the pavers — steel edges chip and scratch the surface over repeated seasons. If you use a plow service, plastic blades are fine; metal blades with carbide edges can chip paver surfaces over time, so ask your operator to switch to a polymer edge or raise the blade slightly.

Cleaning, stains, weeds, and moss

Routine cleaning is the lowest-effort, highest-value maintenance task you can do, and it doubles as your annual inspection.

Regular cleaning

A garden hose rinse a few times a season handles most dirt and organic buildup. For a deeper clean, a pressure washer on a wide fan tip at moderate PSI works well — avoid narrow "turbo" nozzles and high PSI held close to the joints, which can blast polymeric sand straight out.

Weeds and moss

Weeds between pavers almost always mean the polymeric sand in that joint has eroded, leaving an opening for seeds. Pull the weed, then refresh the sand in that joint. Weeds across large sections rather than isolated spots signal the whole surface is due for its 4–6 year re-sand cycle. Moss tends to show up in shaded, damp corners; a gentle wash and improving drainage usually solves it without chemicals.

Stains — oil, grease, and rust

Blot fresh spills immediately rather than wiping, since wiping spreads the stain into the porous surface. For set-in stains, a degreasing paver cleaner and a stiff (not wire) brush lift most residue, followed by a gentle rinse. Sealing pays off here directly: a sealed surface keeps oil and grease sitting on top instead of soaking in, the difference between a five-minute cleanup and a permanent mark.

Ontario-specific considerations

Maintenance timing and technique both need to account for our specific climate — what works in a milder region doesn't always translate here.

Freeze-thaw is the whole reason this schedule exists

With 40–60 freeze-thaw cycles per winter, water sitting in a degraded joint or an unsealed surface pore gets a real chance to freeze, expand roughly 9% in volume, and do mechanical damage. The 4–6 year re-sand and reseal cycle isn't an arbitrary number — it's timed to stay ahead of how quickly Ontario's climate degrades joint sand and surface protection.

Clay soil areas need closer drainage attention

Much of Mississauga, Brampton, and parts of Markham sit on heavy clay soil that holds water and shifts seasonally more than sandy or loam soils do. Standing water on or near your interlock after rain is worth addressing before it becomes a settling problem — flag it during your annual inspection.

Permits and larger maintenance work

Routine sealing, sanding, and cleaning never require a permit. If a maintenance visit uncovers a drainage problem serious enough to need a French drain, catch basin, or regrading that changes where water exits your property, some GTA municipalities require approval — the same rule that applies to new installations.

Timing your maintenance to the season

Spring, right after the thaw, is when winter settling or joint damage becomes visible — the best time to schedule an inspection. Sealing should happen in warmer months; avoid sealing in fall, since the sealer needs several weeks of ambient warmth to cure before winter arrives.

Maintenance mistakes that shorten lifespan

Mistake 1: Using rock salt for winter traction

Covered above, but worth repeating because it's the single most common mistake we see: rock salt is the fastest way to accelerate surface spalling and joint sand breakdown on interlock.

Mistake 2: Letting the joint sand go a decade without a refresh

Polymeric sand isn't permanent. Ignoring it past the 4–6 year window doesn't just invite weeds — it lets water move under the pavers, which is how minor settling turns into a section that needs to be pulled up and relaid.

Mistake 3: Pressure washing too aggressively

A narrow-tip nozzle at close range and high PSI can strip polymeric sand out of the joints in minutes — sand that took a full application to install properly. Stick to a wide fan tip at moderate pressure for routine cleaning.

Mistake 4: Sealing too early or in the wrong season

Sealing before the first 60–90 days traps efflorescence under the coating instead of letting it release. Sealing in the fall doesn't give the product enough warm weeks to cure before winter. Both mistakes are easy to avoid by simply timing the work correctly.

Mistake 5: Ignoring low spots or shifted pavers

A single settled paver is an hour's fix. A dozen settled pavers across a spreading area, left for years, is a multi-day re-base project. Catching it during your annual inspection is what keeps it small.

Mistake 6: Letting a plow service use metal blades on your driveway

Carbide-edged metal plow blades chip paver surfaces over repeated seasons in a way that's permanent and cosmetic — there's no undoing a chipped corner short of replacing that paver. A quick conversation with your plow operator prevents it entirely.

DIY vs professional maintenance

Some of this schedule is genuinely easy to do yourself; some of it is worth hiring out.

Comfortably DIY: the annual rinse and inspection, pulling weeds as they appear, spot-topping a small area of eroded joint sand, and switching your winter salt to sand or a gentler de-icer. None of this requires special equipment beyond a hose or a basic pressure washer.

Usually worth hiring out: the full 4–6 year re-sand and reseal cycle. It's not that homeowners can't do it — it's that getting even polymeric sand activation and a streak-free sealer application across a full driveway takes practice most people don't have a reason to build. A contractor doing this weekly across dozens of driveways finishes it faster and more evenly, often at materials pricing that narrows the DIY cost gap. Edge restraint repair and re-leveling, both of which involve lifting pavers and correcting the base, are also better left to someone who does it regularly.

Signs your interlock needs professional attention

Most maintenance is preventative and scheduled. These are the signs that mean it's time to call someone regardless of where you are in the cycle:

• Multiple pavers sinking or rocking underfoot in one area — usually means the base below has shifted, not just the surface.
• Standing water on the surface more than an hour after rain stops — a drainage or grading issue, not something a re-sand alone fixes.
• Washed-out joints across large sections rather than isolated spots — the whole surface is overdue for its re-sand and reseal cycle.
• Edge restraint visibly pulling away from the perimeter — left alone, the outer rows of pavers will start to spread.
• A section that's noticeably lower or higher than the surrounding surface — classic settling, best fixed while it's still localized.

Any one of these caught early is a straightforward, contained repair. Left for a few more winters, each one tends to spread into a bigger and more expensive job — which is really the theme of this entire guide.

FAQs on interlock maintenance