Uneven or Displaced Cracks in Concrete Driveways

Most driveway cracks lie flat. Sometimes, though, one side of a crack sits a little higher than the other, and your shoe catches on the edge as you walk across it. This guide explains what that kind of crack usually means, what to keep an eye on, and the repair approaches homeowners commonly look into.

An uneven driveway crack (also called a displaced concrete crack) is one where one side sits higher or lower than the other.

What an uneven or displaced driveway crack looks like

• A step or lip along the crack that you can feel with your shoe
• A shadow line that follows one edge of the crack
• One section of concrete that looks tilted or sits lower than its neighbor
• A gap that may be thin or wide (the height difference is what matters here)

Height differences can be hard to see in photos. A picture taken from a low angle can make a step look smaller than it is, so it helps to check in person: crouch down and look along the crack, or slide your shoe across it to feel whether one side catches.

If the sides are level, it's a different pattern. The comparison examples on the homepage show these common concrete driveway crack types side by side.

What it means when one side is higher than the other

A height difference means that part of the slab has moved relative to the part next to it. A photo can show that the sides no longer line up, but it can't tell you why the concrete moved.

Possible contributors to displacement can include changes in the support beneath the slab, moisture, freeze and thaw cycles, settlement of the ground, and repeated loads such as vehicles. More than one of these can be involved, and appearance alone isn't enough to say which applies to a particular crack.

An uneven concrete driveway also doesn't automatically mean the driveway needs to be replaced. Many displaced sections are small and stable, and homeowners often start by watching them.

Displaced, wide, or both?

It helps to keep three patterns separate:

• Wide or open: the sides have separated, leaving a gap, but they sit at roughly the same height.
• Displaced: one side sits higher or lower than the other, whether or not there's a gap.
• Both: the crack has a visible gap and a step.

The height difference is what changes the situation. A wide crack with level sides is often a question of keeping water out of the gap. When one side has dropped or lifted, homeowners usually end up looking at different approaches, since filling a gap doesn't change the height of either side.

What to watch for over time

A single look can't tell you whether the movement has stopped. A few simple checks, repeated every few months, can:

1. Is the height difference increasing? Measure the step with a small ruler held against the higher edge (or another consistent reference), and photograph it from the same low angle each time.
2. Does water pool near the area? Check after rain to see whether water collects on the lower side or runs into the crack.
3. Is nearby concrete sinking? Look for dips, tilted sections, or new low spots around the crack.
4. Does the edge create a noticeable lip? Note whether the step has become something people catch their feet on.
5. Are new cracks appearing? Watch for cracks branching off it or forming nearby.

When driveway sinking, pooling water, or a trip edge matters more

A small step that stays the same is often simply monitored. These are reasons to look more closely:

• The step keeps getting taller from one season to the next
• The area around the crack seems to keep sinking
• Water regularly pools beside the crack or seems to run underneath the slab
• A gap is opening under the edge of a slab, or soil appears to be washing out
• The lip sits in a spot people walk across every day
• New cracks are appearing in the same area

None of these on its own tells you what is happening underneath. They do suggest the area is still changing, which is when many homeowners decide to get a closer look.

Driveway repair approaches homeowners commonly research

Because a height difference is what defines this pattern, driveway repair for an uneven crack often starts with a different question than simply filling a gap: whether the lower section might need leveling, and whether nearby drainage conditions are worth looking at first.

Approaches homeowners commonly research include:

• Slab leveling or lifting. Methods that raise a sunken section back toward the level of its neighbor, usually carried out by a concrete repair company.
• Crack sealing, where appropriate. Sealing helps keep water out of a crack. It's often considered after a section has been leveled, or for small offsets that have stayed stable, since sealing alone doesn't change the height of either side.
• Drainage and water questions. Where downspouts empty, how the ground slopes, and where water collects after rain are common things to look at when a slab has moved.
• Section replacement. In some cases, a badly uneven or broken section is removed and replaced, usually when other approaches aren't expected to hold.

Many homeowners have a concrete repair professional inspect the area before choosing an approach, since the right option depends on how much the slab has moved and whether it's still moving.

The short version

An uneven crack is defined by height, not width: one side sits higher or lower than the other. A photo can show that difference, but not why it happened. Tracking the step over the next few months, and noticing water and sinking nearby, is the best starting point for deciding whether to get a closer look.