Cracks spreading across a garage floor or driveway make any homeowner uneasy, and for good reason. Most slab foundation problems trace back to one cause: the slab sits directly on soil that shifts, moves, and breathes with the seasons. The good news is that not every crack signals a serious issue. Below, we walk through the cracks and warning signs we encounter most often and how we decide which ones truly need repair.
Common Slab Foundation Problems
Most of what we find falls into two buckets: routine settling and surface cracking. Both are normal for our area and rarely signal a failing foundation.
Settling and Surface Cracks
Over time, a slab settles, and the concrete can break up. That shows up as floor cracks and ground cracks on the surfaces you use every day:
- Driveways and sidewalks
- Garage and basement floors
- Back patios
Newer slabs are not immune. It is not uncommon to find cracks at 10 or 20 years old, and plenty of slabs in our area were poured in the 1950s, 60s, and 70s and have held up for 50, 60, or 70 years.
Why a Crack Does Not Always Mean Movement
A slab that breaks up has not necessarily shifted or moved. Many cracks are cosmetic and safe to live with. What matters is the severity, not the crack alone.
Key Takeaway: Not every crack is an emergency. A hairline floor crack is usually routine, but a crack that lifts into a tripping hazard deserves a closer look.
What Causes a Slab to Crack
The cause almost always comes back to the ground beneath the concrete. That is why these problems are so common where we live.
A Slab Sits On Soil, Not Footings
A slab is poured on grade, directly on the soil, with no deep footings underneath it. When the ground shifts, moves, and breathes, the slab moves along with it. This is simply the nature of the soil in our part of the country.
Drought, Rain, and Shifting Soil
Soil movement gets worse in drought-like conditions, which dry out and shrink the ground. Slabs, driveways, and sidewalks tend to shift more during the dry spells we have had lately. A sudden stretch of rain will not undo that damage or close cracks that have already formed.
Pro Tip: After a long drought, watch for new or widening cracks. The rain that follows will not reverse them, so an early assessment saves you money.
Need expert help with a cracked or buckling slab? Contact Olson Foundation Repair for a free consultation.
When Slab Damage Needs Repair
We base every repair decision on the severity of the damage. Some slabs only need monitoring. Others have reached the point of replacement.
When Slab Foundation Problems Turn Serious
A minor crack with a slight lip is usually fine to live with. It is time for a professional assessment when you notice:
- A large buckle or heave in the slab
- A crack that clips or trips you as you walk
- Sections that have dropped or risen noticeably
How We Assess and Repair Your Slab
We evaluate whether the slab can be salvaged or has been damaged beyond repair. In the worst cases, the right fix is a clean repair of that section of concrete. An honest, on-site assessment tells you which path makes sense.
Do not wait for a small crack to grow into a costly buckle. Contact Olson Foundation Repair today to schedule your free inspection and get a clear, honest plan for your slab foundation problems.
