Uneven or Sunken Slabs
Uneven or sunken slabs are settling and maybe settling unevenly. If you have an uneven slab or a slab that is sinking into the ground, it’s important to repair it to prevent further sinking, cracking, or settling.

Do you have places around your home where some of your concrete has settled over time?

Do you have places around your home where some of your concrete has settled over time? This is common and, while normal, can create some issues for you. Concrete that is not level can create tripping hazards, making your home a dangerous place for people to walk, bike, and more. It can also look unsightly, especially when one piece of concrete is significantly lower than the ones around it.
Fortunately, there are ways to make your concrete level again. Contact us at KC Waterproofing and Foundation Repair and ask to talk to our concrete jacking and concrete leveling experts in Overland Park today.
Here are some of the common warning signs indicating concrete settlement:
Uneven or sunken slabs are settling and maybe settling unevenly. If you have an uneven slab or a slab that is sinking into the ground, it’s important to repair it to prevent further sinking, cracking, or settling.
If your concrete slab is settling unevenly, this will create cracks across the slab. Cracks, especially cracks that are growing, are a sign of uneven settling and should not be ignored.
Water pooling in the center or at one end of a concrete surface is an obvious sign of sinking concrete. When concrete settles unevenly, water may pool on the sinking concrete and cause more damage. If you notice pooling water on a concrete slab, it may be time to get it inspected.
Concrete slabs need proper support from the soil underneath them to remain stable. When the soil beneath the slab settles, it may create a visible void underneath the concrete slab. This sign of concrete settlement is usually visible around patios, driveways, and sidewalks.
Concrete leveling is exactly what it sounds like. It means bringing the pieces of concrete that have sunk back up to their original level so that everything is smooth and flat. Our Overland Park concrete lifting experts can level sidewalks, stairs, driveway slabs, and more.
There are a number of methods that we can use to bring your concrete back to level. We’ll choose the one that is best for your specific needs and the specifics of your concrete and the ground underneath it.
Polyjacking is a quick and minimally invasive repair solution for sinking concrete slabs. Whether you have concrete settlement issues on your patio, driveway, or sidewalk, polyjacking can efficiently lift and level them. This repair method involves injecting polyurethane foam to stabilize sinking concrete and restore it to its original position. Here is a closer look at how the polyjacking process is carried out:
Before beginning our repairs, we thoroughly assess the site to identify problematic areas and develop an effective repair plan for sinking concrete. Next, we remove any debris or obstacles so that we can work without interruption. Then, we gather all the tools and equipment needed for the repair.
We drill small holes in the sinking concrete surface. These strategically drilled holes act as entry points for the polyurethane foam. The diameter of each hole is usually less than 1 inch.
We inject polyurethane foam beneath sinking concrete. The foam passes through the drilled hole and fills the voids beneath the concrete. Since the foam hardens quickly, we inject a precise amount and carefully monitor the process to prevent damage. As the foam expands, it fills the empty space beneath the concrete. The hardened foam acts as a supporting structure for the concrete and can raise it back to its initial position.
Once the repair is complete, we remove the debris left behind during the repair process. We clean up any excess foam and fill the holes. Your concrete will be back to normal and ready to use within a few hours.
A free inspection. A written repair plan. The recommended work explained before you decide.
We inspect the concern and the conditions around it.
We explain our findings and prepare your written repair plan.
Our team completes the agreed work with care for your home.
We explain the completed work, care and written warranty.
4.9 / 5 from 1,004 Google reviews.
Great job on my steps and back concrete pad. They came out. Gave me an estimate. Took care of business. Very professional. Thank you
Excellent service and work! I’ve worked with KC Waterproofing and Foundation Repair twice now (for foundation work and most recently window well/waterproofing work). I have been satisfied with their work both times. Always easy to schedule and Recently Riley helped with a quote and was not pushy about moving forward; which was my experience a few years ago too. They don’t take up hours of time to give a quote which I appreciate. The team that did the recent work (main contact was Schuyler) were easy to work with and talk too, very kind. You can tell this group of people works together and works together well. They had a lot of hand digging and they did it very quickly. When an unexpected issue arose (removing some sidewalk) Schuyler laid out the what/why/how plainly in an easy to understand way. They did replace the sidewalk concrete. It was a big job and they got it done in a day and a half and were in high spirits throughout. They cleaned up a lot after the project too, which is appreciated. Schuyler did a final walk-through and answered any questions I had. Pricing was good too, I got another quote that was astronomical for pricing and the other company wasted 3 hours of my time to provide a quote. If I need anything in the future I won’t bother with a second quote as I’ve always had excellent experiences with KC Waterproofing. The support staff is very kind and helpful too, as well as prompt. Overall, excellent experiences; highly recommend!
We had a leak in what we thought was our foundation. Water coming in under our basement floor. Francis Heisinger came and checked it out for us. He could have recommended a French drain that would entail digging, pipes, removing and replacing concrete and lots of money. Being the honest man that he is, he gave us his opinion as to what the problem entailed. Thank you so very much. Should we ever need foundation work done, we will definitely use this company!
In the Olathe/Lenexa area, my wife and I needed some polyjacking done in our front porch as it had started cracking and lowering as well as a major gap filled underneath our back patio concrete slab. From the get-go, Matt and Rhonda were fantastic in communicating with us in regards to process, scheduling etc. Matt is super knowledgeable and was patient with all my questions and concerns. The crew, Vic and Donte were really great in being very personable and professional. As they worked they were clean, and did a great job in the work that we needed and were happy to walk me through the work once it had been done to make sure I was satisfied. We still have some work to have done with some french drains but this group made the experience great. Highly recommend and can't thank them enough for the thorough work.
We recently used KC Waterproofing and Foundation Repair to level our concrete driveway. We had extensive sinking on the driveway due to water intrusion, and we needed over three inches of lift on one side of the driveway. The KC Waterproofing team gave me a fair quote, matched the price of one of their competitors, and provided great service on the day of the project. We are very happy with the end result, and are confident that our driveway issues have been resolved.
Good crew, did a good job and we’ll use KC Waterproofing again if we ever have any other concrete related basement issues.
Vic did a super job with a couple of sunken concrete areas and a crack in our foundation wall. I have used KC Waterproofing several times including the installation of a pier system. I have been beyond impressed with the quality of their work and outstanding customer service!
The work crew that came out to work my basement were incredibly prompt and clean - very little concrete dust thrown up and around, they got all the "big" work done in one day, a little over 8 hours
The crew was timely, they were clear on what they would be doing, they communicated any issues they encountered. The worked to minimize dust from the concrete that had to be broken up. They were professional in every way and did nice work.
KC Waterproofing starts with a free inspection, recommendations for your property, and written promises behind the work. Serving Kansas City homeowners since 1985.
A free inspection. A plan built for your home.
Custom-engineered recommendations, a clear written estimate, and room to ask every question.
“Had an initial consultation with Camden. He was upfront, professional, honest, and very knowledgeable. We haven’t yet made a decision as to next steps, but our experience with the consult was top-notch.”
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We stand behind our work with a written money-back guarantee.
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Cost depends on the condition of your home, access and the work it needs. Your free inspection gives us the information to prepare a written estimate.
No sales tactics. No pressure to decide on the spot. Your written estimate explains the work and the price before you make a commitment.
Your money is never at risk.Our written money-back guarantee stands behind the work.
Before you decide
Answers about repair options, cost and next steps for your property.

Repair settlement, bowing walls and structural movement with a plan based on your home.
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Manage water intrusion with drainage, sump pumps and waterproofing designed around the source of the leak.
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Address moisture, humidity and damaged supports beneath your home.
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