Cracked Driveway? How to Tell If It Needs Repair or a Full Replacement

Start With What Kind of Crack You're Looking At

Not every crack in a driveway means the whole slab has to come out. Hairline cracks that run in a fairly straight line, especially ones that follow a control joint or the edge of the driveway, are often just the concrete doing what concrete does as it shrinks and moves over the seasons. Chicago winters put a lot of freeze and thaw cycles into a slab every year, and hairline cracking is a normal response to that stress, not automatically a sign of structural failure underneath.

What matters more than the crack itself is what's happening on either side of it. Run your hand across the crack. If both sides sit level with each other, you're probably looking at a surface crack that can be sealed or patched and monitored going forward. If one side sits noticeably higher or lower than the other, that's a different conversation, because it usually means something underneath the slab has shifted or washed out.

Settling Is a Different Problem Than Cracking

Settling happens when the soil or fill under a section of driveway has washed out, compacted unevenly, or was never properly prepared before the concrete went in. You'll see it as a dip, a low corner, or a slab edge that's pulled away from the garage floor or the sidewalk next to it. A settled slab can sometimes be addressed on its own, but if the settling is spreading across more than one section, it's usually a sign the base under the whole driveway needs attention, not just the surface poured again on top of it.

This is also where a homeowner's instinct to just patch it can backfire. Patching a crack without fixing the soil movement underneath tends to give the same problem somewhere new to show up the following season, on the same driveway.

Spalling and Scaling: When the Surface Itself Is Failing

Spalling is when small chips, flakes, or chunks break off the top layer of the concrete, often leaving exposed aggregate or a pitted, crumbly texture behind. Scaling looks similar but reads more like a broad, shallow peeling across the surface. Both are usually the result of years of road salt and repeated freeze-thaw cycles working on the wearing layer of the slab. A driveway with light spalling confined to a small area can often be patched or resurfaced. A driveway where spalling covers large sections, or where coarse aggregate shows through across most of the surface, has lost its wearing layer and is generally past the point where patching holds up for long.

What to Look For, Section by Section

• Hairline cracks, level on both sides: usually fine to seal and keep an eye on
• One side of a crack sitting higher than the other: possible base movement, worth a look
• A corner or section that's visibly sunk: settling, likely needs base work
• Chipping, flaking or pitting in one small area: often repairable
• Chipping or pitting across most of the driveway: the wearing surface is gone
• Several different problems showing up at once, in different spots: usually the whole slab

When It's Worth Calling Someone Out

A lot of this comes down to experience reading concrete that's been through decades of Chicago winters. Carl Johanson & Son Construction has been pouring and repairing concrete on the North Side and North Shore since Carl Johanson Sr. started the business in 1909, and the company has been concrete only since Carl Johanson Jr. took it over and built what's now Carl Johanson & Son Construction Co. Inc. That's long enough to have seen most of the ways a driveway can go wrong, and to know which ones are a patch job and which ones genuinely need to come out.

The company offers free estimates, which is usually the fastest way to get a straight answer. Someone comes out, looks at the actual cracking, settling or spalling in front of them, and tells you honestly which one it is, a repair or a replacement. The company is licensed throughout the North Shore suburbs it serves, bonded and insured, with an A+ rating with the BBB. If your driveway has you wondering which side of that line you're on, call (847) 933-1709.