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3 Steps to Level a Concrete Floor

uneven concrete floor

A stable concrete floor is essential for a safe and functional home. Uneven concrete floors are a common problem that can lead to structural issues and safety hazards. Fortunately, several methods are available to level a concrete floor, each with its advantages and disadvantages. 

This page outlines three concrete lifting and leveling techniques, including polyurethane foam injection, mudjacking, and slab replacement, and helps you determine the best solution for your home.

What is Concrete Leveling?

polyrenewal concrete lifting tool and worker's boot

Concrete leveling restores stability to uneven or sinking concrete slabs, creating a smooth, level surface. This process involves filling the voids beneath the concrete, often caused by expansive soil or erosion, poor compaction, or moisture changes.

Concrete leveling prevents further settlement and ensures a safe, stable home foundation when it is part of a comprehensive solution that addresses the underlying causes of damage. A concrete professional can help determine your home’s best course of action.

Concrete Leveling Methods

crew member fixing concrete slab

There are three primary concrete leveling methods, each with its pros and cons: polyurethane foam injection, mudjacking, and slab replacement. The best choice for your home will depend on factors such as the extent of the damage, soil conditions, and your budget.

polyrenewal concrete lifting foam in soil

Polyurethane Foam Injection

Polyurethane foam injection is an innovative, minimally invasive technique injects expandable foam beneath a sunken concrete slab. The foam expands rapidly, filling voids and lifting the slab to a level position.

This repair method is quick, cost-effective, and causes minimal disruption to the property. Unlike other concrete leveling methods, polyurethane injections address cosmetic issues, like floor cracks, and the underlying causes of damage, like soil erosion, providing a comprehensive, long-term solution.

mudjacking slurry


Mudjacking, or slabjacking, is a traditional concrete leveling method that involves pumping a slurry mixture of cement, sand, and water beneath a sunken slab. As the slurry fills the voids, it lifts the slab to a level position.

While effective, mudjacking has limitations, such as adding weight to the soil and not addressing the underlying cause of settlement, which may require additional steps for a long-term solution.

crew member concrete bags wheelbarrow deck

Slab Replacement

Concrete slab replacement may be necessary for severe damage or when other leveling methods are not feasible. This process involves demolishing the existing concrete slab, addressing the underlying soil issues, and pouring a new, level slab. Slab replacement is the most invasive and expensive option, but it provides a long-lasting solution for severely compromised concrete floors.

3 Steps for Polyurethane Foam Leveling

PolyRenewal™ is a patented polyurethane foam injection that provides a quick, long-lasting solution for leveling concrete floors. The process requires about a day to complete and allows for same-day use of the treated area. Here are the three steps for leveling concrete floors using polyurethane foam:

  • Step 1: Penny-size holes are drilled into the sinking concrete, and injection ports are inserted.
  • Step 2: The two-part liquid polymer is mixed and injected into the holes. The polymer expands and fills the void beneath the slab, lifting it to a level position.
  • Step 3: The injection ports are removed, and the holes are sealed and smoothed for a seamless finish.

Why is Polyurethane Leveling Foam the Preferred Method?

Polyurethane foam injection, like the PolyRenewal™ system, offers several advantages over other concrete leveling methods:

polyrenewal concrete lifting tool
  • Lightweight: Polyurethane foam is lightweight compared to other repair methods.
  • Minimal Disruption: The installation process is quick and allows same-day use of treated areas.
  • Controlled Installation: Precise lift control ensures an even and level surface.
  • Resistant to Moisture: Polyurethane foam is water-resistant, making it suitable for indoor and outdoor concrete applications.
  • Cost-Effective: Polyurethane injection is a cost-effective solution, offering long-term results.

Concrete Lifting vs. Concrete Leveling: What’s the Difference?

uneven concrete slab

“Concrete lifting” and “concrete leveling” are often used interchangeably, but there is a subtle difference. Concrete lifting focuses on raising a sunken slab to a stable, structurally sound position, while concrete leveling works to create a smooth surface.

In outdoor applications, concrete leveling maintains a slight slope for proper drainage, while concrete lifting prioritizes raising the slab to a safe and stable position, regardless of perfect flatness. Understanding this difference can help you better communicate your floor repair needs to a concrete professional.

How Groundworks Repairs Concrete Floors

Groundworks work truck

Groundworks specializes in concrete floor solutions with our exclusive PolyRenewal™ system. With years of experience and a team of skilled professionals, we have completed numerous concrete leveling projects, ensuring the safety and stability of homes across Calgary and southern Alberta. 

If your home has uneven concrete floors, contact us for a free inspection. We’ll inspect your property and recommend a tailored solution, ensuring your home remains structurally sound for many years.

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    Shaye Glisson

    Shaye Glisson

    Shaye is an SEO Content Writer for Groundworks with over twelve years of experience creating helpful content across various industries, including home services and retail. She is a Gulf Coast native and writes from her firsthand knowledge of the area's hurricane and flood impacts on the local community. In her free time, Shaye enjoys exploring the local food and music scenes.