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4 Reasons Why Your Concrete Sinks and Cracks

By Holly Richards-Purpura 6/4/24

Concrete is a tough material, which is why it is widely used in constructing many things, from sidewalks and driveways to home foundations and walls. But concrete is vulnerable to wear, tear, and damage. 

Exterior concrete is especially problematic. It can showcase its damage in many ways, including sinking and unevenness. When concrete slabs do not line up because they are sinking, this makes your property look bad and is a safety hazard. 

How does this happen? What can be done to fix it? This article explains why the concrete around your home may be sinking and how local concrete leveling experts at Ohio Basement Authority can help. 

uneven concrete slabs

Top 4 Causes of Sinking Concrete Slabs 

The concrete around your property might be failing and giving you clues through visible sinking and unevenness. While numerous causes are possible, here are the top three common causes of sinking concrete slabs: 


Improper Installation and Materials 

When noticing problems with concrete, some people may be quick to blame those who installed it. This is not as common, but issues can arise with the original installation of concrete and the materials used.

Concrete is a mixture of cement, water, and aggregates like sand or gravel. Problems can result if the wrong amounts are used, the concrete is not poured evenly, or it isn’t properly cured or cut. 

sunken concrete from improper preparation


Excess Weight 

Concrete is strong but to a point. If too much weight is consistently placed on concrete slabs, they can begin to give way and sink.

This is common in driveways and garages, especially if a heavy vehicle is parked there for an extended period of time. According to the Environmental Protection Agency, the average vehicle weighs more than 4,100 pounds. This could mean a lot of stress for your property’s concrete. 

uneven driveway from car weight



The most common cause at the heart of sinking concrete problems is the soil underneath the slabs.

Different soil types have different drainage properties. Soil that is too well-drained can easily wash away and erode. Others, like expansive clay, may hold onto water and constantly swell and shrink. Either way, the soil cannot properly support the slabs and will leave voids underneath them.

There is a variety of soil types throughout Ohio, and the official state soil is known as Miamian, a type of loam soil common to Columbus, Cincinnati, and Lima, that is made up of fair amounts of the three main soil ingredients—sand, clay, and silt. However, other areas are notorious for soil with significant clay content. 

loose soil


The Weather 

The weather also plays a significant role in the condition of your concrete and the underlying soil. Central and Southern Ohio areas commonly experience heavy rain in spring and fall. Summers also can be quite wet, and winters have decent snow that leads to saturating snowmelts. Droughts are rare, but dry spells can cause soil to dry out and shrink. 

Exterior concrete structures like sidewalks, driveways, and patios bear the brunt of Mother Nature’s wrath. Not only does excess water under and around the concrete impact its structural integrity, but water also can easily pool in areas with sinking, uneven slabs. 

heavy rain

Problems with Sinking Concrete Slabs 

As we’ve already mentioned, sinking slabs are unsightly and unsafe for your property. They impact your home’s curb appeal, which greatly matters when you are trying to sell your house.

But more than that, sinking and uneven concrete slabs are tripping hazards. Young children, the elderly, and those with mobility issues are at a greater risk of taking a spill on uneven concrete and sustaining injuries. And anyone walking over sinking concrete can easily catch their feet on raised edges.

Vehicular damage also could result the more your car having to negotiate bumps caused by uneven slabs. 

How to Fix Sinking Slabs 

Sinking concrete slabs can be complex, but they also have a simple solution. The earlier you notice this problem, the easier it is to fix it with a state-of-the-art repair method.

To get to the heart of the problem with your concrete slabs and properly support them, the best way to address them is concrete lifting with PolyRenewal™ polyurethane injections.

This lightweight yet durable foam is injected underneath the slabs through small holes that are drilled. Once the foam expands and hardens (typically within 30 minutes), it lifts the slabs back toward their original positions. 

concrete lifting installation

Trust Ohio Basement Authority for Concrete Leveling Near You!

Don’t let cracking, sinking concrete slabs continue to negatively impact your home. If your property’s concrete could benefit from our innovative repair solution, contact our team at Ohio Basement Authority to schedule a free inspection and repair estimate! We have been lifting and leveling concrete around Central and Southern Ohio for 15 years. Homeowners know they can count on us for unmatched customer service, customized repair solutions, and lasting results.

Holly Richards-Purpura

Holly Richards-Purpura

Content Writer

Holly is a Content Writer for Groundworks who has written and edited web content for the foundation services industry for almost 10 years. With a background in journalism, her passion for the written word runs deep. Holly lives in Columbus, OH, with her husband. Along with educating homeowners, she also has a big heart for the Big Apple.

Disclaimer: “Concrete leveling” means the process by which cracked, uneven concrete is stabilized, and in many cases lifted, by means of PolyRenewal™ polyurethane foam. Ohio Basement Authority does not guarantee that PolyRenewal™ can make your concrete perfectly level. 

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