Can Concrete Driveways Be Repaired? What You Need to Know in Spokane Valley

What Causes Concrete Driveways to Crack or Sink

Most driveway cracks and sinking come from water, freeze-thaw cycles, and weak soil under the slab. In Spokane Valley, winter does a lot of the damage. Knowing the cause tells you whether a concrete driveway repair will hold.

You walk out one spring morning and there it is. A new crack running across the driveway. Or a corner that sits an inch lower than it did last fall.

That's not bad luck. Concrete is strong, but it isn't flexible. When something moves under it or pushes on it, it cracks. We've seen this pattern a hundred times in Spokane Valley. The cause is almost always one of a handful of things.

Here's what we find most often when we dig into a damaged driveway. Some of these start on the surface. Others start a foot underground.

• Freeze-thaw cycles. Water gets into small cracks, freezes, and expands.
• Soil that washes out or settles and leaves gaps under the slab.
• Bad drainage, usually from a downspout or a slope that dumps water at the edge.
• Heavy loads the slab wasn't built for, like RVs or a dumpster parked during a remodel.
• Tree roots pushing up from below.
• Shortcuts during the original pour, such as a thin slab or no compacted base.

Not every crack is a warning sign, though. Hairline cracks show up in almost all concrete as it cures and shrinks. Those are usually cosmetic.

Freeze-thaw is the big one here. Picture a normal Spokane Valley winter day. It's 40 degrees in the afternoon and 18 by midnight. Snowmelt runs into a crack, then freezes solid overnight. Ice takes up more room than water. So it pries the crack a little wider every time. Repeat that dozens of times a season. And deicing salt makes it worse, it eats at the surface and causes flaking and pitting.

Sinking is a different animal. It starts below the concrete, not on top. Water gets under the slab and carries soil away or turns it soft. The slab loses its support and drops. You'll usually spot it first near the garage apron or where the driveway meets the sidewalk.

We had a homeowner off the Sullivan Road corridor call about a driveway that "sank overnight." It didn't. A downspout had been dumping water on the same corner for years. Half the soil under that slab was gone by the time it finally dropped. Rerouting the downspout was step one. Skip that, and any repair fails the same way.

Most homeowners wait too long.

A small crack lets in water. Water feeds the freeze-thaw cycle. But that cycle doesn't stop at the crack. It washes out more soil underneath, and pretty soon you're not looking at simple concrete crack repair anymore

Here's the good news. Once you know the cause, you know if the driveway can be saved. Surface cracks and minor settling usually respond well to repair. Wide cracks that keep shifting point to a base problem. That needs a closer look from someone who knows what to check.

How to Tell If Damage Is Active or Dormant

Here's the question that decides everything. Is your crack still moving?

A dormant crack formed once and stopped. It's done growing. Most of these come from normal shrinkage as the concrete cured years ago. An active crack is still changing. It gets wider, longer, or uneven every season. And that difference matters more than how ugly the crack looks.

Why? Because you can fill and seal a dormant crack and call it good. But patch an active crack without fixing the cause, and it'll split right back open. We've seen this a hundred times in Spokane Valley. A homeowner fills a crack in the fall, it's back by March.

Our freeze-thaw cycles are the big reason. Water slips into a crack and freezes overnight. Ice expands and pushes the gap wider. Then it thaws, drains, and does it again the next night. Spokane winters bring dozens of these swings. So a crack that's active won't sit still for long.

• The crack is wider than a nickel is thick, or it's gotten wider since last year
• One side sits higher than the other, even by a little
• Edges look sharp and clean instead of worn and dirty
• Fresh gray dust or small chips collect along the crack
• Soil or gravel washes out from under the slab edge after rain

Any one of those signs points toward active damage. Two or more? Something under the slab is likely shifting.

Dormant cracks look different. They're usually thin and even. Dirt and moss have settled into them. The edges are rounded from years of weather, both sides sit flat. Old, quiet, and mostly cosmetic.

You don't need special tools to check. We tell customers to run this simple test over one winter. It's the same thing we look for on our first walk-through.

• Pick your worst two or three cracks and take clear photos with a tape measure next to them.
• Use a pencil or marker to draw a small line at each end of the crack. Write the date beside it.
• Check the width with a coin or a cheap feeler gauge. Write it down.
• Lay a straightedge across the crack to see if one side sits lower.
• Come back after the spring thaw, usually March or April here, and repeat every step.

If the crack ran past your pencil marks or got wider, it's active. If nothing changed, it's probably dormant. Simple as that.

One tip from the field. Look at your downspouts while you're out there. Most homeowners don't connect the two, but a downspout dumping water near the slab is behind a lot of the active cracks we see. The water soaks the base, it freezes, and the slab starts to lift and drop. Fix the water first, or any concrete driveway repair is fighting a losing battle

We had a customer off Sullivan Road who'd sealed the same crack three years running. Each spring it reopened. Turned out a gutter was draining straight under that corner. Once the water got redirected, the repair held.

Not sure what you're looking at? That's normal. Some cracks sit right on the line between active and dormant. A trained eye can usually tell in a few minutes.

Repair or Replace: Three Common Driveway Scenarios

Most driveways we look at fall into one of three buckets. Once you know which one yours is in, the decision gets a lot easier. We've been doing this for 11 years around Spokane Valley, and the same patterns show up every spring.

Scenario one is the most common. Thin cracks. A few hairline lines run across the slab, maybe one wider crack near the garage. The concrete is still flat. Nothing has sunk or lifted. This driveway is a great candidate for concrete crack repair. We clean out the cracks, fill them with a flexible material, and seal the surface. That keeps water out. And water is the real enemy here.

Here's why. Spokane gets dozens of freeze-thaw swings every winter. Water slips into a small crack, freezes overnight, and expands. Then it melts and does it again the next night. A crack you could barely see in October can be an inch wide by March.

Scenario two looks worse than it is. The surface is flaking, pitted, or peeling off in thin layers. We call that scaling or spalling. It's usually caused by deicer salt plus freeze-thaw cycles, we see it on a lot of driveways off the Sullivan Road corridor. But the slab underneath is often still solid. If it's flat and not cracked through, driveway resurfacing can make it look new again without tearing anything out.

One homeowner near Opportunity called us sure she needed a whole new driveway. The top was chewed up from years of rock salt. We checked the slab, and it was sound. Resurfacing fixed it in a fraction of the time a tear-out would've taken.

Scenario three is the tough one. Sections have sunk or heaved. Cracks run all the way through and the pieces don't line up anymore. Water pools in low spots. You might trip on a raised edge. This usually means the base underneath has failed. Poor compaction, erosion, or frost heave in the soil can all do it. Patching the top won't fix a bad base, the cracks just come back. At this point, replacement is usually the honest answer.

So how do you tell which one you've got? Walk your driveway and run through these questions in order.

• Is the slab still flat and level? If yes, it's likely repairable.
• Are the cracks narrower than a pencil? Crack repair and sealing should handle them.
• Is the damage mostly on the surface, like flaking or pitting? Resurfacing is worth a look.
• Do slab sections sit at different heights or rock when you step on them? That points to a base problem.
• Is more than a big chunk of the driveway broken through? Replacement is probably the smarter move.

Don't treat this list like a final verdict. It's a starting point. Some driveways land between two scenarios, and that's where an in-person look matters.

Most homeowners wait too long.

We see it every year. A scenario-one driveway gets ignored for three winters and turns into scenario three. The fix that would've taken an afternoon now means a lot more work. Or worse, the damage spreads into the garage apron and the sidewalk

Anyway, the takeaway is simple. Catch it early and repair usually wins.