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Sinking Concrete Slabs

Common in areas where the soil is slightly unstable, sinking concrete is an unpleasant sight that can be a warning sign to homeowners that they are suffering from problems with their concrete.

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A common concrete problem, sinking concrete slabs can make your sidewalk or patio look jagged and uneven. At Peak Structural, our experts are familiar with the area, and they’re equipped with the right tools to lift the concrete. Our free, no-obligation inspections ensure that we will locate and repair the problem.

Different Causes of Sunken Concrete Slabs

Soil Settlement

Over time, the soil underneath your concrete will start to shift. This is especially prevalent with the soils in Colorado, as they are expansive, meaning they react to dry weather by shrinking and wet weather by expanding. When your soil begins to settle, so does the concrete on top of it. While you cannot prevent soil settlement, certain repairs to your concrete can be done to ensure your concrete remains in its place, and it is free of cracks and voids. Knowing the type of soil that your concrete will rest on will help you determine what type of settlement you can expect.


Unfortunately for Colorado, the state frequently experiences periods of little to no moisture, also known as drought. These periods of no moisture can last anywhere from a couple of weeks to a few years. When the soil in Colorado dries out, it begins to shrink, causing the soil to crack. When the soil cracks, so can your concrete. In addition to cracking, voids will be created in the soil, which will cause your concrete slabs to sit unevenly. While you can’t stop a drought, there are certain concrete lifting solutions that help lift and repair your home’s sunken concrete slabs.

Poorly Compacted Soil

When your home’s foundation is being constructed, soil is removed from the area. Once the construction has been completed, some of the soil is added back around the foundation. This process can cause the soil around your home to become unstable, even if the soil has been well compacted. If you have concrete slabs incorporated in your foundation, this loose soil will cause shrinking concrete. This is even more likely to occur if there is also a drought. Keeping your home protected against unstable soil is extremely important for your foundation’s structural stability.


Concrete slabs will begin to sink into the soil over time. Things like soil impaction, type of soil, and even the setting of where the concrete slabs will lay all impact whether your concrete sinks. The climate and amount of pressure being placed upon the slabs will also cause them to sink. While it may be somewhat normal for concrete slabs to sink slightly into the soil, it is still something a homeowner should choose to lift and repair, especially if the problem is excessive.

At Peak Structural, one of the main methods we use to lift your sunken concrete is by adding a polyurethane solution beneath the concrete slabs themselves. The foam expands, filling cracks and voids. This process lifts the concrete, evening them out, and even repairing cracks. The polyurethane foam will continue to work even after the initial lift, as it stabilizes the above concrete and underlying soil. While this is not the only method, it is one of the simplest and most successful.

A method that used to be common – and is even still in use today – mudjacking is also used to lift and stabilize concrete. However, it is not as easy or effective as a polyurethane injection, and it is better suited for use when lifting mostly undamaged concrete. Additional cons of mudjacking include a longer time to dry, susceptibility to erosion, and a need for larger holes that are more difficult to patch. Polyurethane, on the other hand, cures in about 15 minutes, and it will not be washed out under the concrete.

Call Us For A Free Inspection 

Don’t suffer from sunken concrete slabs any longer! At Peak, our team is dedicated to repairing any foundation and concrete problems that may arise during your time in a home. If you suspect that you have an issue with your concrete, reach out to us. We will come out to perform a full inspection of your foundation at no cost or obligation to you. Our inspectors will determine what the problem is, how it should be repaired, and what we can do to repair it. Whether your concrete is sinking, cracking, or both, you should have the problem fixed before additional foundation problems arise.

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707 County Line Rd.
Palmer Lake, CO 80133

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2575 U.S. 6 & 50, Unit A, Grand Junction, CO 81501