Why Is My Concrete Sinking? 7 Causes Illinois Homeowners Should Know
If you’ve noticed your driveway, sidewalk, or patio starting to sink or become uneven, you’re not alone. Sinking concrete is one of the most common issues homeowners face, especially in areas like Illinois where soil movement and weather play a big role. The good news? You usually don’t need to replace it—you can often fix it with professional concrete lifting.
Before jumping into solutions, it’s important to understand why concrete sinks in the first place.
1. Poor Soil Compaction
One of the most common reasons concrete sinks is improper soil compaction during installation. If the ground underneath wasn’t tightly packed, it will settle over time. This creates empty spaces (voids) beneath the slab, causing the concrete to drop.
According to experts, soil that isn’t compacted correctly can shift and compress under weight, leading to uneven surfaces over time.
2. Water Erosion Under the Slab
Water is one of the biggest enemies of stable concrete. Rain, poor drainage, or leaking gutters can wash away the soil beneath your slab.
As the soil erodes, gaps form underneath the concrete. Without support, the slab begins to sink and crack.
If you’re seeing pooling water near your driveway or sidewalk, there’s a good chance erosion is already happening.
3. Natural Soil Settling Over Time
Even if everything was done correctly during installation, the ground naturally settles over time. This is especially common in areas with softer soils.
As the earth slowly shifts, the concrete above it can become uneven or sink in certain spots.
This is completely normal—but it still needs to be addressed before it gets worse.
4. Freeze-Thaw Cycles
Illinois weather plays a huge role in concrete problems. During winter, water seeps into the soil and freezes. When it freezes, it expands. When it thaws, it contracts.
This constant expansion and contraction weakens the soil structure and creates voids beneath your concrete.
Over time, this leads to noticeable sinking and uneven slabs.
5. Heavy Loads on the Surface
Concrete is strong—but it still depends on the soil underneath for support. If you regularly park heavy vehicles or place large loads on a slab, the soil beneath it can compress.
This added pressure speeds up settling and can cause sections of concrete to sink faster than others.
Driveways and garage floors are especially vulnerable to this issue.
6. Tree Roots and Organic Material
Tree roots can disrupt the soil under your concrete. As roots grow, they can shift the ground or leave gaps when they decay.
This creates uneven support, which can lead to lifting in some areas and sinking in others.
If you have trees near your concrete surfaces, this could be a contributing factor.
7. Voids Beneath the Concrete
At the core of almost every sinking concrete issue is one thing: voids.
A void is simply an empty space under the slab where soil has moved, washed away, or compacted unevenly. Without support, concrete cannot stay level.
This is exactly what slab jacking is designed to fix.
Slab jacking works by injecting material beneath the concrete to fill these voids and lift the slab back into place.
How to Fix Sinking Concrete
Now that you know the causes, let’s talk about the solution.
Instead of tearing out and replacing your concrete (which is expensive and time-consuming), most homeowners choose concrete lifting.
At Scritchlow Concrete Lifting and Slab Jacking, the process is simple and efficient. Small holes are drilled into the slab, and a specialized material is pumped underneath to raise it back to its original level. The holes are then patched, and the surface is ready for use—often within hours.
You can learn more about the process here:
https://scritchlowconcretelifting.com/
This method not only restores your concrete but also reinforces the ground beneath it to help prevent future sinking.
Why You Should Fix It Early
Ignoring sinking concrete can lead to bigger problems over time, including:
- Trip hazards and safety risks
- Water drainage issues
- Cracking and further structural damage
- Lower property value
The longer you wait, the more expensive the repair can become.
Final Thoughts
Sinking concrete is a common issue, but it’s not something you should ignore. Whether it’s caused by poor soil compaction, water erosion, or natural settling, the problem usually comes down to a lack of support beneath the slab.
The good news is that modern solutions like slab jacking can fix the issue quickly, affordably, and without the need for full replacement.
If you’ve noticed uneven concrete around your home, it’s worth getting it evaluated sooner rather than later.
Reference:
https://engineerfix.com/what-is-mudjacking-and-how-does-it-work/