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Concrete Leveling2026-11-03T08:27:19-06:00

Concrete Leveling: PolyLevel® Polyurethane Foam Slab Lifting

Before replacing uneven concrete, find out whether lifting is an option instead. PolyLevel® lifts and restores settled driveways, sidewalks, patios, garage floors and other concrete slabs without the cost, mess or downtime of replacement.

What Is Concrete Leveling, Exactly?

Concrete leveling is the process of raising a sunken concrete slab back to its original elevation by filling the empty space beneath it. In most cases, the concrete is still structurally sound on its own—the actual problem is that shifting soil, erosion or poor drainage has opened up voids underneath. Here in VA, freeze-thaw cycles, heavy rainfall, shifting soils and changing moisture levels are common causes of settled concrete. Once the soil beneath a slab moves or erodes away, the concrete is left unsupported and begins to sink.

Unlike traditional mudjacking, PolyLevel® polyurethane foam concrete leveling restores support without adding significant weight below the slab. The expanding foam fills hidden voids, lifts the slab with precision and helps stabilize it for long-term performance.

Why PolyLevel® Stands Apart

Not all concrete lifting methods deliver the same long-term results. PolyLevel® was engineered specifically to raise and support load-bearing concrete slabs, from driveways and sidewalks to patios and garage floors. Its lightweight, closed-cell polyurethane foam won’t take on water or wash away, and it’s installed through small 5/8-inch injection ports that make for a cleaner finish than traditional mudjacking.

For homeowners throughout [Target Location], long-term results matter just as much as lifting concrete. When PolyLevel® is paired with NexusPro® joint sealant, joints are sealed off from water intrusion to help reduce future soil washout—and he result is a complete concrete repair system that protects your investment long after the slab has been leveled.

The Concrete Leveling & Protection System We Use

  • For raising and stabilizing sunken concrete slabs

    PolyLevel®

    PolyLevel® is our exclusive polyurethane foam concrete leveling system, engineered to precisely lift and stabilize settled concrete. Injected beneath the slab, the expanding foam fills the hidden voids, lifts the slab back toward its proper position and cures quickly so most surfaces are ready for normal use the same day.

    • Lightweight material adds virtually no weight to the supporting soil
    • Lifts and supports driveways, sidewalks, patios, garage floors and other concrete surfaces
    • Won’t wash out, shrink or degrade like traditional mudjacking materials
    • Installed through small 5/8-inch injection ports for a cleaner finish with minimal patching
    • No costly tear-out or unsightly patchwork that comes with concrete replacement
    • Quick-curing formula allows most concrete surfaces to be used the same day
    • Waterproof material won’t absorb water or break down over time
    • Eco-friendly, inert material won’t leach into surrounding soil
    • When paired with NexusPro®, helps reduce soil erosion and future concrete settlement
    • Backed by an industry-leading, transferable warranty

  • For sealing joints and protecting your concrete repair

    NexusPro®

    Once your concrete has been lifted with PolyLevel®, sealing open joints and cracks helps protect the repair from future water intrusion. NexusPro® is our professional-grade polyurethane sealant for joints that helps keep water from carrying away the supporting soil beneath your concrete, reducing the chance of future settlement.

    • Seals expansion joints and cracks after concrete leveling
    • Helps keep water from washing away the soil supporting your concrete
    • Helps reduce soil erosion and safeguard the PolyLevel® repair
    • Flexible polyurethane flexes with seasonal expansion and contraction
    • UV resistant to help prevent cracking and deterioration
    • Resistant to water and deicing salts
    • Covered by an industry-leading transferable warranty
How It Works

The PolyLevel® Leveling Process

Step 1

Your Free Inspection

Your Design Specialist evaluates the entire concrete surface, maps low areas, measures elevation changes and determines whether PolyLevel® is the right solution. You’ll receive a written repair recommendation and estimate before any work begins.

Step 2

Prep the Slab

Our crew maps strategic injection points and drills small 5/8-inch holes through the concrete—about the size of a penny. We also protect nearby landscaping, walkways and surrounding surfaces before the lift begins.

Step 3

Begin Lifting the Concrete

PolyLevel® polyurethane foam is injected beneath the slab, where it expands to fill the hidden voids beneath the slab before gently raising the concrete back toward its original position.

Step 4

Fine-Tune the Lift

During the entire process, our crew watches the slab’s elevation with specialized leveling equipment. Additional foam is injected as needed to achieve a smooth, even surface with precise results.

Step 5

Finish & Seal

Once the slab is level, the injection holes are patched, and expansion joints can be sealed with NexusPro® to help keep water from carrying away the supporting soil. Most concrete is ready for foot traffic in about 15 minutes and vehicle traffic within an hour.

When Is Concrete Leveling the Right Solution?

Most uneven concrete doesn’t need replacing at all. If the slab is structurally sound and the issue is caused by settling soil or erosion beneath it, PolyLevel® can bring the concrete back at a fraction of the cost and disruption of replacement.

If the concrete has extensive structural damage—including severe cracking, widespread spalling or a compromised base—replacement may make more sense in the long term. On your free inspection, your NV Waterproofing and Foundation Repair Design Specialist will determine whether concrete leveling or replacement is the right option for your property in [Target Location].

Common Applications Around the Home

  • Settled driveways
  • Settled sidewalks
  • Settled patios
  • Settled pool decks
  • Sinking garage floors
  • Settled steps and stoops
  • Uneven basement slabs
Benefits

Why work with NV Waterproofing and Foundation Repair for Concrete Leveling?

Concrete around homes across [Target Location] deals with changing soil conditions, heavy rainfall, freeze-thaw cycles and seasonal moisture swings year-round. Given enough time, those forces can leave driveways, sidewalks, patios and garage floors uneven or sunken.

At NV Waterproofing and Foundation Repair, our trained crews rely on the PolyLevel® system to restore settled concrete with precision—without the cost or mess of replacement. Every repair begins with a free inspection, includes a written recommendation and carries an industry-leading transferable warranty. When appropriate, we also seal joints with NexusPro® to help protect your repair from future soil erosion.

What To Expect

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An expert will inspect the problem area and surrounding conditions, including soil movement, drainage, structural integrity, and any related concerns.

Clear explanation
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We’ll walk you through what we’re seeing in easy-to-understand language so you know the root cause of the issue, not just the symptoms.

Review recommendations

If repairs are needed, we’ll outline your options, pricing, and timeline so you can make the best decision for your home.

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Customer Information

Don't just take our word for it

See what our customers have to say about our work.

NV Waterproofing was extremely responsive and 100% committed to identifying our water problem and designing a solution. Their work was excellent. The crew was on time and organized. They were very careful to protect the exterior landscaping and the interior of our home from dirt and debris. Even two years later, they responded to a sump problem at no additional charge. NV Waterproofing does the job right and stands behind its work.

Mike and Lynn F. | Columbia, MD

We bought a house in a state of disrepair, and so we've had to work with a number of contractors. I'd rank this company at the top of the list for their professionalism, knowledge, experience, and honesty. We had bowing of our basement walls that needed to be addressed. Michael came out to assess the situation, and gave us some options. After speaking with him, I felt very confident in their ability to buttress our walls. It was also a huge bonus that we were able to set up a payment plan for this job too. When the team showed up, Casey, Kevin, and Grant, they were super polite and professional. They took great care of our property, and if they had a question about anything, they asked. Also, if I had a question, Casey (the foreman), was very knowledgeable and quick to answer. They presented the work as they progressed through the job, and really, I was actually a little blown away by the scale of the project, and the speed at which they worked. What an impressive job they did! We're very confident in the work they did and will hire them again.

Ellen M.  | Takoma Park, MD

We were referred to NV Waterproofing from my brother-in-law who used them and was pleased. They came out and gave us an estimate - they were very prompt. We had the work done - it looked great and I am sure will do the job (only time will tell). We did have a miscommunication with the work (mostly on our part), but the owner had it fixed promptly and without additional cost. I would highly recommend them to anyone with water issues in their basement.

Susan C. | Washington DC, DC

NV stuck with me and made sure I was happy. Roberto Jr kept me calm as my problem persisted and kept working on a solution beyond the obvious. I highly recommend. Looking forward to a dry basement this summer.

Dean R. | Washington, DC

I am writing this letter to commend members of your organization for the waterproofing work performed on and around the foundation of my house. Despite situations beyond the control of both me and your associate, he always maintained professionalism and demonstrated why he is an outstanding representative of your organization. The crew obviously knew what had to be done and went about doing it. They were prompt in arriving at work each day, diligent in the performance of their duties (in spite of high heat and humidity), and took measures to ensure the safety around the excavated area (important because of children in the neighborhood). Unlike other construction sites I have seen, the crew maintained the area free of litter— no small measure these days! In addition, the crew always provided clear explanations of the work to be done each day, answering the questions with forthright and clear responses, never hurrying the discussion. As I was not on site while work was being done, they called me several times, taking those extra steps to keep me informed of the status of the work and aware of the tasks yet to be performed— something that is greatly appreciated. I would appreciate it if you would offer my heartfelt thanks to your able crew for the quality waterproofing work performed and the excellent communication and coordination exhibited by them.

Myra L. | Washington, DC

In my 12 years of having NV Waterproofing as a business partner, they have always proved reliable and trustworthy. They are a great value for me and my customers.

Darryl O. of Brookfield Homes, | Washington, DC

Great professional service and able to respond in timely manner to the project need.

Blake B. | Washington, DC

Brendan was very knowledgeable, professional and courteous. Highly recommend.

Cesar T. | Arlington, VA

A brief note to thank NV Waterproofing for extreme professionalism and courtesy in the manner in which my recent basement water seepage problem was addressed. From the initial contact with Jim, through the work with Roberto, Carlos and Jose, it was an overall pleasant experience – not to mention my contact with the owner and his responsiveness.

Ramesh T. | Arlington, VA

These guys were amazing. The initial visit was smooth, not pushy at all and he was even able to accommodate the relocation of a small drainage pipe. The demo to install the system was done beautifully, yes it was really good, you can tell they were precise and careful when doing so. Everything was clean, no stains on my carpet and they protected everything. No leak so far and I love it. Did I mention the price was excellent? I had 3 other companies to estimate thousands and even tried to sell extra unnecessary equipment. Thank you NV Waterproofing I have and will continue to recommend you.

Chelly Z. | Falls Church, VA

We appreciated NV Waterproofing's honesty and the men who worked tirelessly in uncomfortably cold weather. We've had one big storm since they finished and the basement walls are nice and dry. Nice work!

Peter V. | Falls Church, VA

Mauricio and Cristian were the initial sales reps who came to examine the issue and they took the time to test drainage that might have potentially been creating the water issue. They offered a reasonable solution (sealing the visible cracks and holes in the concrete) and I was contacted within a couple of days with an estimate and scheduling options. Sean was our tech and he did a fantastic job diagnosing the issue beyond just the cracks. He not only address all the holes and cracks in the concrete and mortar, he sealed up additional entry points above the foundation. He sourced additional materials to cover openings for cable lines. He went above and beyond and gave us measured information on how we should continue to monitor and treat this area as the house settles. He was thorough, informative, and provided excellent service in his work. I'm very glad that Sean was the technician sent to us and I would specifically request him for your projects.

Sara T. | Falls Church, VA

Before & after photos

Check out before and after photos from some of our completed projects.

  • Sunken Concrete Step Repair in Stephens City, VA

    This Stephens City, VA homeowner was dealing with a sunken concrete front step that had settled over time, creating an uneven entryway and a noticeable tripping hazard near the front door. Sunken concrete steps can make everyday foot traffic unsafe for homeowners, guests, and delivery drivers, while also taking away from the home’s curb appeal. Our concrete repair team lifted and leveled the front step back to its proper position, creating a safer, more stable walkway and entrance. This concrete step repair helped reduce the risk of falls, improved the look of the front entry, and gave the home a cleaner, more welcoming appearance. The homeowner was thrilled with the outcome — a big transformation that improved both safety and curb appeal!

  • Basement Waterproofing in Winchestor, VA

    A homeowner in Winchester, VA, was struggling with a failing sump pump that couldn’t keep up during heavy rainstorms, leaving their basement vulnerable to water intrusion. The lack of a reliable backup system also left them worried about potential flooding during power outages. Frustrated and seeking a dependable solution, they contacted NV Waterproofing and Foundation Repair, a trusted basement waterproofing company in Winchester, VA.

    After assessing the situation, we replaced their old sump pump with a state-of-the-art TripleSafe Sump Pump system. This advanced system includes three levels of protection: a primary pump, a secondary pump for heavy water flow, and a battery backup to ensure the basement stays dry even during power outages. The homeowner now has peace of mind knowing their basement is fully protected, no matter the weather.

  • Pool Deck Leveling in Manassas, VA

    A homeowner in Manassas, VA, quickly realized their dream backyard pool was at risk when the surrounding concrete pool deck began to show serious problems. Uneven and sunken slabs created tripping hazards and unsightly cracks, making both safety and aesthetics a challenge for anyone using the space. Additionally, water from rain and pool use was pooling in low spots, causing slippery surfaces and further soil erosion beneath the deck. These issues not only threatened the safety of family and guests but also compromised the value and enjoyment of the home.

    Seeking an effective solution, the homeowner reached out to our team for a professional assessment. We identified the main cause of settlement: soil erosion under the slabs—a common issue in Manassas due to its clay-rich ground and fluctuating moisture. To address both the immediate hazards and prevent future damage, we recommended our two-part approach: the cutting-edge PolyLevel® concrete leveling system and NexusPro® Joint Sealant.

    The repair process began with drilling small holes into the affected concrete slabs, allowing us to inject high-strength PolyLevel® polyurethane foam beneath the surface. As the foam expanded, it filled voids, stabilized the soil, and gently lifted the slabs back to their original positions. The process was quick, clean, and minimized disruption, giving the pool deck a level, safe surface once again. PolyLevel® foam is waterproof and lightweight, reducing the risk of future settling and ensuring long-term durability, even in a wet poolside environment.

    To provide further protection, we sealed all cracks and joints with NexusPro® Joint Sealant. This flexible, weather-resistant sealant prevents water from seeping beneath the slabs, protecting the soil and concrete from additional erosion. The result was a clean, finished appearance that not only improved the look of the deck but also safeguarded it for years to come.

    Thanks to modern concrete leveling technology, the homeowner’s pool deck was transformed from a liability into a safe and attractive outdoor gathering space. The project was completed in a single day, with minimal mess and immediate results, giving the homeowner peace of mind and renewed pride in their backyard. If you’re facing similar issues with your pool deck in Manassas, VA, the PolyLevel® system and NexusPro® Joint Sealant offer a fast, effective, and lasting

View all before & afters

Our service area

Proudly Serving Northern Virginia, D.C., and Suburban Maryland

Frequently Asked Questions

Why does concrete sink? 2026-10-05T15:06:35-05:00

Concrete usually sinks because the soil underneath it changes—not because the concrete itself wears out. In VA, heavy rainfall, poor drainage, soil erosion, freeze-thaw cycles and seasonal moisture changes can create voids beneath concrete slabs. PolyLevel® fills those voids and restores support without replacing the concrete. 

Can concrete be leveled instead of replaced? 2026-10-05T15:06:08-05:00

In plenty of cases, yes. If the concrete is structurally sound and settling soil is the cause rather than extensive damage, PolyLevel® can lift and stabilize the slab without demolition. At your free inspection, your NV Waterproofing and Foundation Repair Design Specialist will determine whether concrete leveling or replacement is the best long-term solution. 

Does concrete leveling last? 2026-10-05T15:04:57-05:00

Concrete leveling is engineered to provide a long-lasting repair. PolyLevel® is a waterproof, inert polyurethane foam that won’t wash out, shrink or break down over time. It’s engineered to permanently fill voids beneath concrete slabs and is backed by an industry-leading transferable warranty. 

Can PolyLevel® fix cracked concrete? 2026-10-05T15:01:26-05:00

It depends on what caused the crack. If uneven settlement is what cracked the slab, PolyLevel® can lift and stabilize the concrete before the crack is sealed with NexusPro®. Hairline or cosmetic cracks unrelated to settlement may only need sealing. At your free inspection, we’ll recommend the right repair for your concrete. 

Is PolyLevel® better than traditional mudjacking? 2026-10-05T15:00:39-05:00

For most homes across VA, yes. PolyLevel® uses a lightweight polyurethane foam that won’t add unnecessary weight to the soil below or absorb water like traditional mudjacking materials. It’s installed through small 5/8-inch holes, lifts with precision and is designed to deliver longer-lasting performance in areas with shifting soils and seasonal weather. 

How long does concrete leveling take? 2026-10-05T14:49:20-05:00

Most residential concrete leveling projects are completed in just a few hours, though larger repairs can sometimes take up to a day. Once the last PolyLevel® injection is complete, the concrete is typically ready for foot traffic in about 15 minutes and vehicle traffic within an hour—far sooner than the days required for new concrete to cure. 

How much does concrete leveling cost on average? 2026-10-05T14:48:20-05:00

Concrete leveling costs depend on the size of the slab, how far it has settled, accessibility and whether additional repairs like NexusPro® joint sealing are recommended. In many cases, PolyLevel® costs 30–50% less than replacing the concrete while delivering long-lasting results backed by a transferable warranty. Schedule a free inspection and we’ll provide a written estimate. 

Related pages

Service Areas

NV Waterproofing has locations throughout Northern Virginia, D.C., and Suburban Maryland.

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At NV Waterproofing, we pride ourselves on providing permanent solutions, and stand behind our work with industry-leading, fully transferable warranties and guarantnees.

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