Why Is My Concrete Slab Sinking In The Middle?

Discovering a dip in the middle of your concrete slab isn’t just an eyesore. It can lead to safety risks and structural concerns for your home.

If you’ve noticed this issue in your basement or other concrete slab areas, you’re not alone. Slab sinking is a common problem that can develop over time due to a range of factors. But what causes it to sink specifically in the middle, and what should you do about it?

At The Crack Guys, we specialize in fixing settled concrete and helping homeowners maintain safe, stable foundations. Let’s explore the main reasons your slab may be sinking in the middle — and how to address it.

Common Reasons For Sunken Slabs

A sinking slab is typically the result of unstable or shifting soil. Below, we’ve broken down some of the factors that can cause problems for your home.

Soil Erosion

One of the most common reasons for a sinking middle is soil erosion. If water drains poorly or there’s a hidden plumbing leak, water can wash away the soil under the center of the slab. This erosion weakens the soil’s ability to support the slab, causing it to sink specifically in that area. In basements, erosion issues from outdoor drainage can be a culprit.

Soil Settlement

The soil beneath a slab can settle unevenly over time, especially if it wasn’t properly compacted before the concrete was poured. While the edges of the slab might stay supported by more stable soil, the center can begin to sink. This issue creates a dip that needs addressing sooner rather than later.

Natural Soil Shifting

In areas with expansive soils like clay, the ground itself can shift with moisture changes. When soil expands and contracts due to wet or dry conditions, it can pull away from the slab, creating gaps and causing the middle to sag. This shifting is common in regions with seasonal weather changes or frequent rain.

Fixing Settled Concrete — How Our Team Can Help

If the concrete slab under your home has shifted or settled, you need the help of a professional. At The Crack Guys, we can perform services like polyjacking to fix your foundation! This is where we inject expanding polyurethane foam to fill gaps and lift the slab back into position.

This lightweight but durable option adds stability without putting extra pressure on the soil, making it a great choice for delicate areas. We can also help by adding piers for support. For severe cases, piers may be installed under the slab to add support to the middle area.

These piers stabilize the slab and prevent further sinking, especially in locations with ongoing soil movement. This approach is typically used in larger or heavier slabs needing strong support.

The Risks Of Ignoring A Sinking Slab

You might be tempted to ignore a small dip in your concrete slab, but the risks of waiting can add up quickly. It can result in the following and more:

• Damage to flooring — A sinking slab puts uneven pressure on the rest of the structure, often causing cracks or buckling in flooring materials.
• Decreased home value — If the damage goes unrepaired, the value of your home will decrease. Plus, repair costs will likely rise over time as the damage worsens.
• Safety hazards — When the middle of a slab sinks, it creates an uneven surface that can be a tripping hazard, especially if the area is frequently used.
• Foundation strain — The stress put on your home’s understructure can result in costly structural issues.

If you suspect foundation trouble, you need The Crack Guys! We understand the significance of ensuring your home is structurally sound, and we’ll work hard to deliver the results you need.

Is Your Basement Floor Sinking? Call The Crack Guys Today

The Crack Guys knows that a solid, stable foundation is essential to your home’s safety and value. Our team has the expertise to assess sinking slabs, identify the best solutions and help you keep your home safe.

If you’re seeing signs of the basement floor sinking or suspect an issue with your concrete, don’t wait. Reach out today to schedule an assessment and ensure that your foundation is strong for years to come.