Updated July 2026
If you are planning a new patio, walkway or driveway in Ottawa, the surface you choose has to survive more than one nice summer. It has to survive our winters. Water gets into the ground, freezes, expands and pushes on everything above it. Then it thaws. Then it does it again. That cycle repeats many times a year here, and it is hard on hard surfaces. This guide walks through how interlock, poured concrete and asphalt each handle Ottawa's climate, what happens when they fail, and how each one is repaired. We build in interlock, and by the end you will understand why. But we want you to make the call with clear eyes, so we have tried to be honest about the trade-offs on every side.
Why is freeze-thaw the real test for a surface in Ottawa?
Ottawa does not have one long freeze. It has a season of freezing and thawing, over and over, from late fall into spring. Water soaks into the ground and into any small gap in a surface. When it freezes it expands. When it thaws it drains. Each cycle nudges the material a little.
A poured concrete slab and a sheet of asphalt are, in effect, one large piece. When the ground under one part heaves and another part does not, the material has to absorb that stress somewhere. Often it absorbs it by cracking. Once a crack opens, more water gets in, and the next freeze makes it worse.
Interlock behaves differently because it is not one piece. It is many individual pavers sitting on a deep, compacted base with sand-filled joints. When the ground moves, the joints flex and the pavers shift together instead of a rigid slab tearing itself apart. That flexibility is the whole point, and it is why we consider interlock so well suited to a climate built around freeze-thaw.
Cracked concrete or a paver you can lift and reset: what's the real difference?
This is the biggest practical difference between the three. When poured concrete cracks, you cannot un-crack it. You can patch it, but the patch shows, and the crack is now a weak line that tends to keep moving. When the damage is bad enough, the fix is to break out the slab and pour again.
Asphalt is more forgiving than concrete in some ways because it flexes a little, but it still cracks, ruts and develops potholes over time. Ottawa sun and heat soften it in summer, and the freeze-thaw pulls at those soft, worn spots. Sealcoating helps it look fresh, but it is maintenance you repeat, not a permanent fix.
With interlock, a single damaged or settled paver can be lifted out and reset, and the same paver often goes back down. If one small area settles, we can pull up that section, correct the base, and relay the same stones. You are repairing a spot, not replacing a surface. That is a very different repair story over the life of the project.
Where does the water actually go?
Drainage is easy to ignore until it becomes a problem, usually water pooling against your foundation or a walkway that turns to ice. A solid slab of concrete or asphalt sheds water off its surface, which means you have to get the slope exactly right or the water ends up somewhere you do not want it.
Interlock manages water in two ways. It can be sloped to direct runoff like any surface, and the sand-filled joints between pavers let some water move down into the base rather than sheeting across the top. Combined with a properly built base, that helps keep water moving away from the house.
However you surface your yard, the base and grading underneath matter more than the material on top. We design the drainage into the project from the start rather than hoping the slope works out, because water that is not managed is what feeds the freeze-thaw damage in the first place.
How do repairs and patches age over the years?
Think about the long term, not just installation day. Concrete tends to age by cracking and by surface scaling, where the top layer flakes off, often made worse by winter road salt tracked onto it. Repairs are visible and the colour rarely matches.
Asphalt ages by fading, cracking and softening, and it asks for regular sealcoating to stay looking its best. That is an ongoing cost and chore, not a one-time expense.
Interlock ages differently. Because it is modular, maintenance is mostly topping up polymeric sand in the joints and, if needed, resetting the odd paver. The stones themselves are dense and made for this. When a repair is required, it blends in because we are working with the same units that are already there. Over a long Ottawa timeline, that modular nature is what keeps the surface looking intentional rather than patched.
What does each surface do for curb appeal and resale?
Concrete and asphalt are honest, functional surfaces, and there are ways to dress up concrete. But in plain form they read as grey and black. Interlock gives you colour, texture, patterns, borders and the ability to tie a driveway, walkway and patio together into one designed look.
That design freedom matters for curb appeal, and a finished, coordinated front yard is one of the first things a buyer sees. A patio that still looks sharp years in tends to read as a home that has been cared for.
We work with Techo-Bloc and Permacon, which give a wide range of colours and styles, so the finished project can suit the age and character of your home rather than looking like a default.
How does interlock actually compare on cost?
We will not pretend interlock is the cheapest option on day one. Poured concrete and asphalt usually cost less up front, and that is a real and fair reason people choose them. If budget is the single deciding factor for a given project, that is a conversation worth having openly.
The way we think about it is over the full life of the surface. A lower up-front cost that leads to cracking, patching and eventual replacement can cost more across the years than a higher up-front investment that avoids that cycle. Interlock is the higher investment that is built to be repaired in place rather than torn out and redone.
We do not publish prices in a guide because every yard is different, and an honest number depends on your site, your base conditions and your design. Financing is available through our third-party partner iFinance if it helps you spread the cost, though any figure we discuss is illustrative only and not an offer of credit. What we will always give you is one honest price up front for the exact project you approved.
Why do we build in interlock, and how do we quote it?
Being straight with you: we build patios, walkways, driveways, steps and retaining walls in interlock because it fits Ottawa. It handles freeze-thaw by flexing instead of cracking, it can be repaired one paver at a time, it helps with drainage, and it looks the part for years. That is the case for it, and we think it is a strong one. We are also the Ottawa deck builder many of these same customers call next, since a deck and a patio are often part of one backyard plan.
The other half of the answer is how we build it. The base goes in as compacted lifts, the bedding sand is screeded level, and the joints are locked with polymeric sand. A surface only lasts if the layers you never see are done right, and that is where a cheap install quietly fails.
Before we cut or place anything, every project is designed in 3D and AutoCAD, so you approve the exact look and an honest price up front. If your patio or driveway needs a City of Ottawa permit, we handle the permit drawings and bylaw setbacks as part of the build. We are family-owned, locally owned, licensed and insured, we back our work with a written workmanship warranty in your project agreement, and we serve Ottawa, Kanata, Barrhaven, Orleans, Nepean, Stittsville and Gloucester. When you are ready to talk it through, call (613) 902-6137 or email info@ottawadeckingsolutions.ca.
Common questions
Does interlock crack like concrete in Ottawa winters?
No. Interlock is many individual pavers sitting on a deep compacted base with sand-filled joints, so when the ground heaves during freeze-thaw the joints flex and the pavers shift together. Poured concrete and asphalt are effectively one large piece, so that same ground movement often shows up as a crack.
Can a damaged interlock paver be repaired without redoing the patio?
Yes. A single settled or damaged paver can be lifted out, the base underneath corrected, and the same stone reset. You repair a spot rather than replacing a surface. Cracked poured concrete cannot be un-cracked; a patch shows, and the crack becomes a weak line that tends to keep moving.
Is interlock more expensive than poured concrete or asphalt?
Up front, usually yes. Poured concrete and asphalt normally cost less on day one, and that is a fair reason people choose them. The case for interlock is over the full life of the surface, where it is built to be repaired in place instead of running through a crack, patch and replace cycle. We do not publish prices in a guide because an honest number depends on your site, your base conditions and your design.
Which surface handles drainage best?
Interlock manages water in two ways: it can be sloped to direct runoff like any surface, and the sand-filled joints let some water move down into the base rather than sheeting across the top. Whatever material you choose, the base and grading underneath matter more than the surface on top, because water that is not managed is what feeds freeze-thaw damage.
What maintenance does interlock need?
Mostly topping up polymeric sand in the joints and, if needed, resetting the odd paver. Asphalt asks for repeat sealcoating to stay looking its best, and concrete can scale at the surface, which winter road salt makes worse.