The Real Seal Basement Waterproofing and Foundation Repair offers concrete leveling services in Oak Park, Illinois using polyjacking to raise and level sinking concrete slabs, patios, pathways, and driveways. Expanding polyurethane foam is used in this method. Compared to other alternatives like mudjacking, it is a non-toxic concrete leveling method.

What Is Concrete Leveling?

Does your concrete have that sinking feeling? When concrete slabs settle, they sometimes need a lift. The Real Seal can provide that lift and get your concrete driveway, patio, sidewalk, or even a garage floor back into position again. We do work in Oak Park and throughout the surrounding area.

Concrete leveling is the process of raising concrete by injecting polyurethane foam below the slab. As the foam expands, it lifts the slab and will hold it in place for a lifetime.

Concrete Leveling In Oak Park, Illinois

Does Concrete Leveling Work?

When we have any job done, we want to make sure it is going to work properly. Since most people don’t have concrete leveling done at their home or business more than once, it is understandable that they would wonder if it worked, and how well it worked.

First of all, yes, concrete leveling works, and with the method we use (polyjacking), concrete leveling works extremely well. It is more effective than mudjacking and much less expensive than replacing the slab.

Best of all, once we lift the concrete back into place and make sure it is level, you won’t even be able to tell we were there. We will patch the small holes that were used to inject the polyurethane foam under the slab and clean up the entire site.

When Do You Need Concrete Leveling?

There are a few different reasons why someone would consider concrete leveling but the most obvious is if the concrete has settled. Due to less-than-ideal soil conditions, roots, poor drainage, and other issues, the soil may no longer hold the slab effectively.

As the concrete settles, it will create tripping hazards. This could be because one slab settles next to an adjacent slab that does not settle. Since concrete does not bend, it may also crack, leading to an unsightly issue and a tripping hazard.

As long as the concrete has not significantly deteriorated, we can use polyjacking to get it back into place once again. In many cases, any cracks will significantly disappear after we do the lift as well.

Concrete Leveling Methods

Like many different construction-related jobs, you have options when it comes to leveling concrete slabs. Some options are better than others, which is why we only use the top option, polyjacking.

It’s good to know about the different types of concrete leveling methods before making a choice. Here are the two primary options. The other choice is to remove the concrete and replace it with a new slab.

Mudjacking

Mudjacking was the industry standard for concrete leveling before the advent of polyjacking. It is still used by some concrete leveling companies but it is largely considered to be an unreliable and outdated slabjacking method.

Large holes are drilled in the concrete and a pump is used to force a slurry of sand, soil, and cement below the slab. The mixture pushes the concrete slab up and into place.

There are several issues associated with mudjacking, including the heavy weight of the material, excessive cleanup, and a short life span. It may be necessary to have the process completed again within 3-5 years.

Polyjacking

We only recommend and use polyjacking at The Real Seal. Polyurethane foam is a lightweight material (2lb per sq ft) and it will last for many years once it is in place. We can inject the polyfoam through small holes drilled in the concrete and cleanup is quick and easy.

You can compare polyjacking to mudjacking but there really isn’t a comparison. Since polyjacking became available, it has mostly replaced the old method of mudjacking. Once we inject the polyurethane foam under the concrete, the slab can be used normally within 15 minutes.

We Offer Concrete Leveling Using Polyjacking Near You in Oak Park, IL

Many Oak Park residents are familiar with settling concrete. Wet soil, nearby roots, poor drainage, and the freeze-thaw cycle can affect what is under the concrete, causing the slab to sink. The Real Seal can fix this problem quickly and permanently.

We have been working on concrete, basements, foundations, and more in the Oak Park area for many years. You can trust the experienced technicians to provide the best polyjacking services available and leave your property in great shape when we are done.

Types of Concrete Leveling The Real Seal Offer

Patios

Driveways

Pool Decks

Sidewalks

Foundations

Concrete Steps

Porches

Garage floors

Poly Jacking Process

Polyjacking is a multi-step process that is performed by an experienced concrete leveling technician. Each job is unique, but they often include the following steps in the process:

1. Drill Holes:

5/8″ holes are drilled in the concrete to allow us to inject the polyurethane foam under the slab. We then insert tapered injection ports so the foam can be injected properly.

2. Concrete Grinding (Optional):

There may be times when we grind the slab where it has sunk next to another slab or if the concrete has cracked where it settled. This is to allow the slab to move freely during the lift.

3. Manual Lifting (Optional):

A sidewalk jack is sometimes used to lift the slab slightly. This allows for a larger void under the slab where the polyurethane is injected. It also makes the entire process easier.

4. Foam Injection:

We use industry foam injection guns to inject the polyurethane foam under the slab. It goes under as a liquid and quickly begins expanding.

5. Expansion:

Once the liquid polyurethane mixture is under the slab, it begins to quickly expand to up to 50 times its original size. As the foam expands, it compresses any loose soil and, at the same time, pushes the slab upward.

6. Clean Up:

Any excess polyurethane foam scrapes away easily. We then fill the holes in the concrete and clean up the area where the work took place. The only evidence you will have of our being there is a level concrete slab.

The Benefits of Polyjacking

We only use polyjacking for our Oak Park customers. This is due to the many benefits that it provides. Below is a short list of those benefits you are sure to experience.

Weight

Polyurethane foam only weighs about 2 pounds per square foot. The lightweight nature keeps the foam from sinking over time.

Time

We can inject polyurethane foam quickly and easily with a minimal amount of equipment. You can get back to your life sooner with polyjacking.

Environment

Polyurethane foam is non-toxic and will not harm the environment once it is in place. There is also very little waste associated with polyjacking.

Control

The lift is very precise when it is done by a trained professional.

Water

Polyurethane is hydrophobic, so it can be used in the wettest conditions or even under water.

Long-Lasting

Some forms of slabjacking only last a few years but polyjacking is designed to last for a lifetime. As long as the soil under the slab is stable, it will likely even outlast the homeowner.

Customer Reviews

This is a great company to have work on any project within their scope. I had a really bad leak from one of my walls and couldn’t find the source. From the first phone call to completion of work the experience was seamless and easy. I called for an estimate, they came same day for the estimate, the next day they did the work, then they did such a great job that I requested them to do more work in other areas of my basement that I knew needed work that I had been holding off for some time. So far they performed well services, two foundation cracks in my basement, and a smile and professionalism throughout the entire process. Paying was easy using their online platform, the process of scheduling was great, and the work is beyond quality and every line item from that quote (and going above and beyond) was completed. No corners cut, no inferior products used, and everything George (my amazing technician) did was explained during the process. I used this company in my previous house and so far so good there have been no issues 4 years in. They did such a great job there that I called them when I moved into this house recently. I requested specially for George on the additional work because of his outstanding work, professionalism, punctuality, and courteous service. I don’t know what other type of service any other company would provide, but I’m going with the company that is true and tried from my own personal experience. If you don’t know much about foundation cracks there will be waterproofing companies that will take advantage of you. The required repairs in my previous house was a simple sealing of my foundation cracks but from another company quoted they told me I needed to repair my French drain, re-trench, take out part of the wall, for a total of $12,500 dollars. Really? These guys came out and fixed my problem there for less than 700 dollars and permanently solved my problems at the old house. Please be careful when you are shopping for quotes, there are companies that will quote you on additional things you do not need. Go with professionals like Real Seal!!!
Issues came up during a home inspection and I called Real Seal for a quote on repairs. Jeff came to do the estimate and he was extremely knowledgeable and thorough. He explained things to me so that I could understand the issues he identified. Jeff was honest and transparent about the repairs explaining that they were not nearly as extensive as previously believed. He emailed a detailed quote within a week.

In the end, we didn't need to do the repair as it wasn't deemed a true hazard. Even though we didn't wind up using their services, I was happy for the in-depth analysis from Jeff and the team.
Real Seal exceeded all expectations! From the moment I reached out, their team responded quickly and professionally. Their customer service was incredibly focused on making sure every question was answered and every concern was addressed with care. You can tell they genuinely care about their clients. The workmanship was excellent — precise, clean, and done right the first time. I highly recommend Real Seal to anyone looking for reliable, high-quality service. A top-tier experience from start to finish!
My 10' x 10' concrete patio slab settled 3-3/4" to 4-3/4" (10-3/4" to 11-3/4" below the tread of the bottom stair riser) and across the width of the 7' stoop. Adjoined to the patio slab is a 3' x 6' concrete pad for two A/C units. I am an architect by profession and I submitted a detailed drawing to The Real Seal for an estimate to saw cut the A/C pad from the patio, thus leaving it level, and to polyjack the patio slab at the stoop in order to regain a proper 7" stair riser. Uneven stair heights are dangerous and not building code compliant. Raising the patio slab at the stoop would also regain the proper slope away from it for drainage. The Real Seal's estimator, Jeff Kowalik, and I met on site, where we reviewed the details and the proposed remediation. Jeff was confident that the desired results were doable. Within days, he emailed a detailed and acceptably priced cost estimate. The work was scheduled within a week after my approving the estimate. The office and field crew provided timely correspondence. A two-man crew, led by Raymund Malvaez, arrived as scheduled, and the sawcutting and polyjacking were completed as designed without incident. They were meticulous in polyjacking the patio slab to the correct elevation across the entire width of the stoop while keeping the A/C slab level and at its existing grade elevation. The small drill holes required for polyjacking were patched and are virtually unnoticeable. A construction sealant was neatly applied between the patio slab and stoop. I couldn't be more satisfied with the overall project experience from start to finish. The Real Seal has my endorsement for professional service as well as outstanding concrete leveling and polyjacking workmanship.
Had a great experience with Real Seal. Jim was so kind and helpful identifying cracks in our basement and came up with a solution to seal them. His proposal was emailed a few hours later. Once we signed the contract, I got a call to schedule the sealing for the next day which was done by noon. I felt no pressure during the experience and walked away feeling great about the work they did. Highly recommend.
If you need basement waterproofing, stop searching and call The Real Seal. Jeff was my estimator, he was knowledgable and friendly. I was provided a quote in timely fashion. Work was scheduled and completed without issue. The guys (George and crew) did a nice job cleaning up. I left my basement wall open for April rains and no more leaking!!! Very pleased with my entire experience and wouldn't hesistate to use them again!
The Real Seal team did a phenomenal job on our project. We needed to lower our basement floor by a couple feet in order to put in a golf simulator. The crew worked tirelessly and went out of their way to protect our home from dust and debris from the process. They were very transparent and communicative, and patient will any questions that I had along the way. I give them my highest recommendation.
Real Seal did an outstanding job for us in replacing our window wells. Great communication and excellent work. We would definitely work with Real Seal again and we very highly recommend them.
Great experience with Real Seal. We moved into a remodel where a former contractor (not sure which company) sealed up a basement leak incorrectly leading to water in our basement months after moving in. Real Seal promptly came out to inspect and consult, quoted a fair price, and then repaired the crack; educating me along the way about what went wrong and how they would repair to ensure there would be no more water. I'm so thankful for their service and lifetime warranty.
Great to work with and clear in explaining how their process works. No pressure on the estimate. Arrived on time, answered our questions and were complete professionals. I would recommend this company. 💯
Sal and Omar arrived on-time and did an excellent job repairing the cracks in the foundation and installing the new piping for the crawlspace sump pump. Sal completed the exterior work in the dark nd cold and took the extra time to make sure it was just right ! The whole process from quote to completed job was what was promised.
Fantastic organization to do business with. The process was professionally handled from the initial call to the end of project. They quickly identified the issue, provided a solution, and quote in the same day. Our yard looks like it was never touched and there was a ton of digging performed. We went through the heavy rains the other day and no issues. Thank you to the entire team!
Fantastic service by Omar and Rob! Would definitely use The Real Seal again!
Our foundation had developed cracks, and the corner of our house was sinking by nearly 3/4 of an inch. After getting multiple quotes, Real Seal offered a competitive price and appeared to be highly knowledgeable. Their warranty was also the best among all the vendors. They scheduled the work for six weeks later and started on time. The project was set for three days, and they completed everything as planned. The crew was professional, respectful, and did an excellent job cleaning up the area afterward. Highly recommend them!
Quality materials, trained and experienced staff that made us feel confident thoroughly the process.... no new decisions were made until we has all options and safety concerns discussed... highly recommend The Real Seal!!!
We had a fantastic experience with Real Seal Basement Waterproofing & Foundation Repair! Rob, the structural engineer, came out first to inspect and assess the damage. He was extremely thorough, professional, and took the time to explain what he was seeing, which helped us feel confident in the next steps.

George, our technician, did an outstanding job with the repair. During the process, he discovered a 2x4 that had been bolted directly into the foundation wall—a possible cause of the cracking we were seeing. He explained how that kind of pressure can lead to long-term structural issues, which we never would have realized on our own. George not only fixed the problem, but also walked me through the repair process and what was being done to ensure the wall would be properly supported going forward.

Both Rob and George were professional, knowledgeable, and respectful throughout. It’s rare to find a company where both the inspection and the repair sides are this strong. I’d highly recommend Real Seal to anyone needing foundation repair or basement waterproofing. Their team brings both skill and great communication—exactly what you want for something as important as your home’s foundation.
Real Seal was professional throughout. Communication was clear, and they helped us seal cracks in our basement foundation while also offering helpful guidance on a few home improvements. Initially, their quote was a bit on the higher side, but they worked with us to resolve the issue at a very fair price. We’d definitely use them again.
Jesus and his team did amazing job to install french drain system in our basement. They were fast, efficient, organized and super clean at the site. Everyone in the company is great , very knowledgeable at their job. On top of that their price is very reasonable, highly recommend!
Very pleased with my experience. Hired to install foundation piers.
Real Seal came out and was able to provide a clear, well-thought out plan to address water issues in the basement. The installation of the drain tile system and sump pump was quick, the crew was great, and the system is running very well. Really wonderful job--thanks!
Great Company with excellent employees. Highly recommend !!!!!
I had such a great experience with the real seal. David and Susan were awesome and answered all of my questions when I started the process. The crew that came to install the liner was also amazing they were very respectful, kind, and helpful with any questions that I had. They came the day after a snow storm and the temps dropping and still got everything done.
Promot, efficient, knowledgeable, and reasonably priced. Would hire again.
Great work, super friendly service and very communicative.
Great communication with their team and excellent quality of work. Their specialist went the extra mile on site which we all appreciated. Would definitely rely on them again.
George Ledezma is a very hard worker! He pays attention to details, make sure the jobs are completed to customer satisfaction and is a leader. He deserves a promotion for his loyalty towards Real Seal.
the most dependable and thorough waterproofing company in the Chicagoland area. Been using them since we moved into our house in 2011. Austin and his team consistently crush it.
I can't recommend this company enough. Theirs is by far the best customer service I've ever experienced from any company regardless of the business they're in. There are a lot of choices for basement waterproofing, especially in Chicagoland, but Real Seal is a standout.
The crawlspace to basement conversion was great! The crew clearly knew what they were doing and paid close attention to detail. For such a large project, we had a lot of anxiety going in, but Real Seal went above and beyond to make sure the project went smoothly. Every contractor and inspector who stopped by was also impressed by their work!

If you have a crawlspace want to add square footage to your home (or have a nice new spot to wait out tornados), I highly recommend reaching out to Real Seal about a conversion.
I'm so grateful that I got The Real Seal to solve my basement water issues. They sealed several cracks and did drainage work outside to get the water away from my foundation. The guys that did the work were very friendly and knowledgeable.
I never used them personally but they respond to all the comments on their website and offer whatever help they can which is very helpful for DIYer’s like me. If they were in Philadelphia I would undoubtedly use them. Great people.
Great job RealSeal. This is my second sidewalk leveling project. Both have been performed very well.
Real seal has been very helpful with all the projects that I had completed this summer. I had foundation cracks repaired, two basement windows and wells replaced at a reasonable price. The work was completed as promised and area cleaned of the debris. They also referred me to a contractor who completed the foam spray for insulation in my crawl space who completed the work as I requested.
Did a great job of explaining whats needed, what's less important, and happy with results so far.

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