What Is Concrete Leveling?

Concrete leveling is a repair method used to raise settled concrete slabs and, when appropriate, restore support beneath them without removing and replacing the entire slab. Over time, soil movement, erosion, poor compaction, water drainage, and changes in moisture conditions can contribute to settlement beneath concrete surfaces.

When the ground beneath a slab loses support or shifts, the concrete may sink, become uneven, or develop changes in elevation. These conditions can affect the appearance, usability, drainage, and safety of driveways, garage floors, patios, porches, walkways, and sidewalks.

Concrete leveling addresses settlement by injecting a lifting material beneath the existing slab. The material is introduced through strategically placed holes and used to fill accessible voids, improve support, and raise the concrete toward a more appropriate elevation.

What Methods Are Used to Level Concrete?

Two commonly used methods are mudjacking and polyurethane foam injection. Both methods involve injecting material beneath an existing concrete slab to raise it, but they use different materials, equipment, and installation techniques.

Mudjacking uses a pumpable grout slurry, typically containing soil or other mineral aggregates and cementitious material, to lift and support the slab. Polyurethane foam injection uses a formulated polymer that expands after injection to lift the concrete and occupy space beneath it.

Neither method is inherently better than the other in every situation. Both have advantages and limitations, and each serves a purpose depending on the project. The right choice depends on factors such as the condition and thickness of the concrete, underlying soil conditions, access requirements, desired results, and the specific materials and equipment being used.

At Oregon Concrete Leveling, LLC, we offer both traditional mudjacking and polyurethane foam injection. We believe offering both methods allows us to explain the differences, evaluate the conditions, and help customers choose an appropriate solution for their particular project rather than recommending a single method for every situation.

Mudjacking

Mudjacking: Earth-Based Concrete Lifting

Mudjacking is a traditional concrete leveling method that uses a pumpable grout slurry to raise settled concrete slabs and help restore support beneath them. At Oregon Concrete Leveling, LLC, we use a specialized system designed to lift existing concrete through approximately 1-inch-diameter injection holes—roughly the diameter of a U.S. quarter.

How Our Mudjacking System Works

The process begins by drilling strategically placed holes through the settled concrete. We then pump our grout mixture, consisting of sandy loam, sand, and cement, beneath the slab. As the material fills accessible voids and builds support beneath the concrete, controlled pumping allows us to raise the slab toward its intended elevation.

Once the lifting process is complete, the injection holes are filled with an appropriate patching material. This approach can restore the usability of many settled driveways, garage floors, patios, porches, walkways, and sidewalks without requiring the entire slab to be removed and replaced.

A Durable, Earth-Based Grout Mixture

Our system uses a mineral-based, cementitious grout rather than an expanding polyurethane foam. The mixture is designed to harden into a firm, rock-like material that helps support the concrete above it. It also lifts under hydraulic pressure so we can control the lift extremely well. 

Like any concrete repair method, long-term performance depends on the quality of the installation, the condition of the existing slab, the supporting soil, and site drainage. When properly installed under suitable conditions, grout-based lifting can provide durable, long-lasting support.

Does Mudjacking Add Too Much Weight?

A common concern is that the weight of the injected material will cause the concrete to settle again. Although grout adds weight beneath the slab, that fact alone does not determine whether a repair will succeed. The relevant considerations include the soil’s load-bearing capacity, the volume and density of the grout, the slab’s condition, and the underlying cause of settlement.

Mudjacking systems have been used in heavy-duty applications, including airport pavement stabilization and lifting. However, the suitability of any particular grout system depends on its engineering design and the conditions at the project site. Our approach is to evaluate the application rather than assume that grout weight automatically makes mudjacking unsuitable.

Our Experience With Long-Term Performance

Our experience with traditional mudjacking comes from years of hands-on concrete lifting work. Across my work and the experience shared with my mentors over approximately 15 years, we have found this method to be a durable solution for suitable concrete leveling projects.

We have not received warranty callbacks on the jobs covered by that experience. While individual results vary and no repair method can guarantee that concrete will never move again, this track record has reinforced our confidence in the method when it is properly applied.

An Alternative to Polyurethane Foam Injection

Mudjacking and polyurethane foam injection use different materials and serve different purposes depending on the project. Our mudjacking system uses a sandy loam, sand, and cement grout, while polyurethane systems use formulated polymer materials that expand after injection.

For property owners who prefer a mineral-based, cementitious lifting material, mudjacking offers an alternative worth considering. As with any construction work, wet grout must be handled properly and kept away from pets, plants, waterways, and unintended areas until it is safely contained and the worksite is ready for use.

At Oregon Concrete Leveling, LLC, we offer both mudjacking and polyurethane foam injection. We can explain the differences and help you determine which method is appropriate for your concrete, soil conditions, and project requirements.

Polyfoam

Polyurethane Foam Injection: A Specialized Concrete Leveling Solution

Polyurethane foam injection is a modern concrete leveling method that uses an expanding, two-component chemical system to lift and support settled concrete. The material is injected through small holes, typically around 5/8 inch in diameter, and expands beneath the slab to fill voids and raise the concrete. Once the material cures, it forms a lightweight support beneath the surface.

Where Polyurethane Foam Works Well

Polyurethane foam has important advantages in the right applications. Its lightweight properties can be beneficial where adding substantial weight beneath a slab is a concern. Depending on the product and site conditions, it can also be useful for filling certain voids, stabilizing concrete, and addressing specialized structural support needs.

For projects involving slab-on-grade foundations or other structural applications, the appropriate repair method should be determined by the specific conditions and, when necessary, a qualified structural engineer. Not every foam product or concrete leveling contractor is suited to every structural repair.

Understanding the Limitations

Although polyurethane foam can be durable and effective, it is not the best solution for every concrete leveling project.

• Chemical handling and curing: Polyurethane systems commonly use isocyanate-containing components. Uncured chemicals can pose significant health risks through skin or eye contact and inhalation. Proper protective equipment, ventilation, installation procedures, and manufacturer-specified curing precautions are important. Occupants and pets should be kept away from the work area as directed by the product manufacturer.
• Expansion control: The foam expands through a chemical reaction. Experienced installers must carefully manage injection placement, pressure, and material volume to reduce the risk of over-lifting or unintended movement. The process requires skill and judgment.
• Concrete staining and residue: Foam or its chemical components can leave difficult-to-remove residue and may discolor or damage some surfaces, depending on the product and circumstances. Careful application is important because cured polyurethane can be extremely difficult to remove from concrete.
• Cost: Polyurethane foam injection is often more expensive than traditional mudjacking, although the actual price depends on the project, materials, access, and site conditions.

Closing statement 

The Right Method Depends on the Job

At Oregon Concrete Leveling, we recognize that polyurethane foam has a legitimate place in the concrete repair industry. Its low weight, expansion characteristics, and ability to address certain voids make it a useful option for specific applications.

However, we do not believe it should automatically be selected for every settled driveway, patio, walkway, or garage slab. Mudjacking and polyurethane foam injection each have advantages and limitations. The best choice depends on the slab, underlying soil, void conditions, intended use, budget, and the requirements of the repair.

Because we offer both mudjacking and polyurethane foam injection, we can evaluate the project and help customers compare the available methods rather than assuming one solution is right for every situation.

Our Commitment: The Right Solution for Your Concrete

At Oregon Concrete Leveling, our priority is finding the right solution for your concrete—not selling you a product you don’t need. We would much rather work with you to evaluate your project, explain your options, and make an honest, professional recommendation than push a particular method simply because it is available. Choosing the wrong approach can lead to unnecessary expense or complications both now and down the road.

Because we offer both traditional mudjacking and polyurethane foam injection, we can help you compare the advantages, limitations, and costs of each method and determine which is most appropriate for your situation.

Our work is backed by a warranty, and we stand behind the work we do. We believe in honest recommendations, quality workmanship, and treating every customer’s property as if it were our own. Our goal is to leave you confident that you made the right decision—not wondering whether you were sold something you didn’t need.