Home / Foundation Repair / Foundation Cracks
Foundation Repair · Learning Center
Foundation Cracks in the Quad Cities
You spotted a crack in the basement wall and your stomach dropped. Here’s the honest truth: most cracks aren’t the emergency homeowners fear, but a few genuinely are.
Based on more than 1,200 written inspections and nearly 10,000 estimates across the Quad Cities in the last ten years.
Not Every Crack Is Structural
Let’s start with the truth that takes the pressure off: most of the cracks we’re called out to look at are not structural problems. Concrete and block move a little as they cure and as the ground shifts with the seasons, and in our expansive Quad Cities clay some hairline cracking is almost expected.
In particular, most vertical cracks in poured concrete walls are not structural. A leaking one should be sealed, but it usually isn’t a sign your foundation is failing.
Our Philosophy
Every crack is evaluated individually. We diagnose first, then recommend the repair that actually fits the problem, not the biggest one.
Behncke Construction · since 1948
What We Look For
When we evaluate a crack, we’re not reacting to its existence, we’re reading its details. Five things tell us almost everything:
- Width — a hairline is very different from a gap you can fit a coin into.
- Displacement — is one side pushed in, out, or sideways? That matters more than width alone.
- Direction — vertical, diagonal, or horizontal tells us what force is at work.
- Wall movement — is the wall itself bowing, or just cracked?
- Type of foundation — poured, block, or stone all behave differently.
Vertical vs. Horizontal: The Single Biggest Tell
If you remember nothing else, remember the direction of the crack, especially in a block wall.
Vertical cracks in poured walls are usually not structural. Worth sealing if they leak, but typically not a sign of failure.
Horizontal cracks in block are serious. They often mean soil pressure is pushing the wall inward. Our saturated clay expands against basement walls, and block is most vulnerable to that sideways force. Caught early it’s very manageable, often with steel I-beam reinforcement. Ignored for years, it gets more expensive.
The Fear vs. the Reality
Almost every homeowner who calls us about a crack assumes it means a huge repair bill. In our experience, that usually isn’t true. Many crack repairs are genuinely affordable, and plenty of cracks need nothing more than monitoring.
How to Monitor a Crack Yourself
If a crack isn’t an emergency but you want peace of mind, you can keep an eye on it yourself:
- Tape over the crack — a strip that tears tells you it’s moving.
- Draw dated reference lines so you can see if it widens or shifts.
- Photograph it periodically from the same spot to track changes.
A crack that’s stable for years is reassuring. One that’s steadily moving is telling you it’s time to act.
How We Repair Cracks, and Why Epoxy Alone Isn’t the Fix
When a crack does need repair, the method matters. Crack injection — epoxy or polyurethane — is one of our regular tools. It’s the right call for a stable crack that isn’t moving, and for structural re-bonding when an engineer specs it. What we don’t do is inject a crack while the wall is still moving or exterior water is still pushing in and call it fixed — we’ve been called back to plenty of injections that failed for exactly that reason.
More often, the better answer is to reinforce the wall so the underlying force is addressed. Our preferred reinforcement is steel I-beams. And when water is involved, sealing from the exterior beats patching inside. See our foundation repair overview for costs, or the repairs we don’t recommend.
Frequently Asked Questions
Are vertical cracks structural?
In poured walls, usually not. They should be sealed if they leak, but they’re typically not a sign your foundation is failing.
What does a horizontal crack in a block wall mean?
Usually that soil pressure is pushing the wall inward, common with our Quad Cities clay. Caught early it’s very manageable, often with steel I-beam reinforcement.
Is a foundation crack an emergency?
Most cracks are not. If you’re concerned, monitor it and get an honest second opinion before any major decision.
Do you use epoxy crack injection?
Yes — epoxy and polyurethane injection are in our toolkit, and injection is the right fix for a stable, non-moving crack. What we won’t do is rely on injection alone when movement or exterior water is the real cause. Then the source gets fixed first, and the crack gets sealed after.
Worried about a crack? Get an honest look.
We’ll tell you plainly whether it’s structural and recommend only what your home needs, written estimate, usually within one business day.
Found a Crack? Let’s Read It Together.
You don’t need to be an expert, just notice a few things. You observe; we interpret. We never ask a homeowner to diagnose their own repair.
Where this leads: Bowing Wall · Wall Bracing & Carbon Fiber · What It Costs · Get a Second Opinion
Straight answers, no sales pressure
Foundation crack questions we hear from Quad Cities homeowners
The questions we get most from Davenport, Bettendorf, Moline, Rock Island, and LeClaire, answered the same way we’d explain them at your house.
I have a crack in my foundation, should I be worried?
Not every crack is a problem, the pattern tells the story, so we read the crack before recommending anything. A thin, hairline crack that isn’t growing is often just something to monitor or seal. A stair-step or widening crack usually means water and soil pressure are pushing on the wall, poor drainage is the recurring culprit, whether it’s grading that slopes toward the house, a downspout dumping at the corner, or winter frost in wet soil, and that’s worth addressing before it moves further. The free evaluation tells you which kind you have, so you’re not lying awake guessing.
Cracks in my drywall and doors that stick, is it my foundation?
It can be. When drywall cracks (especially at the corners of doors and windows) show up alongside doors and windows that suddenly stick, it can mean the foundation has moved and the framing above is shifting with it, though humidity and normal settling cause some of it too. The way to know is to look at the foundation itself and see whether the movement lines up. We’ll tell you honestly whether it’s structural or cosmetic, and sometimes it’s a relief to hear it’s the latter.
There’s a crack with water coming in, can you repair it?
Yes. If the crack is stable, a crack injection seals it and stops the water. But we always check whether the crack is also moving, because if the wall is shifting, sealing alone won’t hold, that becomes a structural fix (brace it, then seal). And water at a crack sometimes has company: if it’s also welling up where the wall meets the floor, the crack isn’t the only path in. We find every path before we call it fixed.
Can you do crack injection on a poured foundation?
Yes, crack injection is a standard repair for poured concrete walls and one of the fixes in our regular toolkit. For a stable, non-structural crack it fills and seals the crack against water. If we find the crack is still moving, we’ll tell you injection alone won’t last and walk you through what actually would, no upsell, just the honest fix.
Related guides: Stair-Step Cracks: Minor or Structural? · Is My Foundation Crack Serious?