Concrete Crack Repair vs. Replacement: How to Tell What You Actually Need

Most homeowners who call us about a cracked driveway or basement floor assume the worst. In our experience across Box Elder County, the majority of those cracks are repairable—and replacement is the more expensive answer to a question nobody asked.

Here is the framework we actually use on site.

Start with the width of the crack

Pull out a tape measure or slide a coin into the gap.

• Under 1/8 inch — almost always cosmetic shrinkage from the original cure. Seal it and move on.
• 1/8 to 1/4 inch — worth watching. We’ll mark the ends with a pencil and check in a few months.
• Over 1/4 inch, or offset vertically — this is structural movement, not shrinkage. Get it looked at.

That last category is the one that matters. A crack where one side sits higher than the other means the soil underneath is doing something, and sealing the surface will not stop it.

Then look at what’s around it

A single crack in an otherwise sound slab is a repair. What changes our recommendation is pattern:

• Cracks radiating from a corner usually mean settlement at that corner.
• A network of map-like cracking across a large area often means the mix or the cure was wrong.
• Cracks that reappear in the same spot after a previous repair mean the underlying cause was never addressed.

What repair actually involves

For structural cracks we use epoxy injection, which bonds the concrete back together and is genuinely stronger than the original slab at that joint. For cracks that still move seasonally we use polyurethane, which stays flexible.

Neither is a caulk-tube job. The injection has to fill the full depth of the crack, which is why surface patching from a hardware store tends to fail within a season or two of Utah freeze-thaw.

When we do recommend replacement

We’ll tell you to replace when:

1. The slab has settled more than an inch and creates a trip hazard or drainage problem.
2. Cracking is widespread enough that repair costs approach replacement cost.
3. The base underneath has washed out—patching the top of a slab with nothing under it just buys time.

The honest version

Repair is usually a fraction of replacement cost, and for most of the basements and driveways we see in Brigham City, repair is the right call. We would rather do the smaller job well and have you call us for your kitchen in three years.

If you’re not sure which category you’re in, send us a few photos with something for scale next to the crack. We can usually tell you over email whether it’s worth a visit.