Introduction of Polyjacking

Introduction of Polyjacking

Polyjacking, also known as polyurethane concrete lifting, is a relatively new method for repairing and stabilizing sunken or uneven concrete surfaces. This innovative technique has gained popularity in the construction industry due to its efficiency, affordability, and effectiveness. In this article, we will explore the basics of polyjacking, its process, benefits, and applications, providing a comprehensive understanding of how this emerging technology is transforming the way we approach concrete repairs. Whether you are a homeowner, contractor, or property manager, this article will serve as a useful guide to understanding the introduction and uses of polyjacking.

Polyjacking Cost

Polyjacking Cost

Polyjacking is a cost-effective solution for repairing sunken or cracked concrete slabs without having to completely replace them. It involves injecting a specialized polyurethane foam mixture into the voids underneath the concrete, which expands and stabilizes the area.

The cost of polyjacking can vary based on several factors, including the size and location of the project, the condition of the concrete, and the level of expertise of the contractor. On average, polyjacking can cost anywhere from $5 to $25 per square foot, with the national average being around $10 to $15 per square foot.

The cost of polyjacking is significantly lower compared to other methods of concrete repair, such as traditional mudjacking or complete slab replacement. This is because polyjacking requires less labor, equipment, and material, making it a more cost-effective option.

Another factor that can affect the cost of polyjacking is the size of the project. Generally, the larger the area that needs to be repaired, the lower the cost per square foot will be. This is because the equipment and materials used for polyjacking are typically priced based on the volume rather than the surface area.

The location of the project can also impact the cost of polyjacking. Projects that are in remote areas or have difficult access can incur higher costs due to the transportation of equipment and materials. Additionally, projects that require polyjacking in multiple areas or levels of a building can also result in increased costs.

The condition of the concrete is another important factor to consider when estimating the cost of polyjacking. If the concrete is severely damaged, cracked, or has significant voids, it may require more foam injection to stabilize and lift the slab, leading to higher costs.

The level of expertise of the contractor can also affect the cost of polyjacking. It is vital to hire a reputable and experienced contractor who has the necessary equipment and knowledge to perform the job correctly. A skilled contractor can ensure the proper amount of foam is injected and that the project is completed efficiently, potentially reducing overall costs.

In conclusion, while the cost of polyjacking may vary, it is generally considered a cost-effective solution for repairing sunken or cracked concrete. Its affordability, durability, and time-saving benefits make it a popular choice among homeowners and commercial property owners. It is essential to consider all the factors mentioned above and get multiple quotes from reputable contractors to get a better understanding of the final cost.

Process of Polyjacking

Process of Polyjacking

Polyjacking, also known as polyurethane concrete lifting or slabjacking, is a process used to raise and level sunken or uneven concrete surfaces. This method involves injecting polyurethane mixtures underneath the concrete slab, which then expands and lifts the slab back to its desired level. It has become a popular alternative to traditional mudjacking due to its efficiency and effectiveness.

The process of polyjacking involves several steps that are typically completed by a team of trained professionals.

1. Inspection and Preparation:
The first step in the polyjacking process is to inspect the damaged concrete surface and determine the cause of the settlement. This could be due to soil erosion, poor compaction, or water infiltration. Once the cause is identified, the affected area is prepared by cleaning it of any debris, dirt, or vegetation.

2. Drilling Holes:
Next, small holes are drilled into the concrete slab at strategic locations. These holes are typically 5/8 inches in diameter and can be drilled through any type of concrete, whether it be a driveway, sidewalk, patio, or garage floor. The location and number of holes depend on the size and shape of the slab being lifted.

3. Injecting Polyurethane:
Once the holes are drilled, a two-part polyurethane mixture is injected through them using specialized equipment. This mixture consists of a liquid polymer and a catalyst, which when combined, create a chemical reaction that causes the mixture to expand and harden. The mixture starts to fill the voids and gaps underneath the slab, lifting it in the process.

4. Monitoring and Leveling:
As the polyurethane mixture is injected, it is constantly monitored by the technicians to ensure it is reaching the desired areas and lifting the slab evenly. Through the use of pressure gauges and leveling equipment, the technicians can adjust the injection process to achieve the desired level and prevent any damage to the slab.

5. Filling the Holes:
Once the concrete slab has been lifted and leveled, the holes that were drilled are filled with grout. This helps to seal the holes and provide extra reinforcement to the concrete.

6. Cleanup:
Finally, after the polyjacking process is complete, the equipment and materials used are removed, and the work area is cleaned up. The excess polyurethane mixture, grout, and any debris are cleared, leaving a clean and level surface.

Overall, the process of polyjacking is a quick and non-invasive solution to repair sunken or uneven concrete surfaces. It can be completed in a matter of hours, unlike traditional methods that may take days. Additionally, the use of lightweight materials minimizes the load on the underlying soil, reducing the chances of future settlement. With proper installation, polyjacking can provide a long-lasting and cost-effective solution for uneven concrete surfaces.

Advantages of Polyjacking

Advantages of Polyjacking

Polyjacking, also known as polyurethane concrete lifting, is a method used to repair and stabilize concrete structures that have settled or cracked. It involves injecting expanding polymer foam beneath the concrete slab, which lifts and levels the structure. This technique has gained immense popularity in the construction industry due to its numerous advantages. Let’s discuss some of the key benefits of polyjacking.

1. Cost-effective: Polyjacking is a cost-effective solution for concrete repair. The materials used are relatively inexpensive compared to traditional methods such as replacing or grinding down the concrete slab. In addition, the process is less labor-intensive, which reduces the overall cost of the project.

2. Time-saving: Polyjacking is a quick process that takes only a few hours to complete, depending on the size of the project. This means that concrete structures can be repaired and put back into service immediately, minimizing downtime and inconvenience.

3. Minimal disruption: Unlike traditional concrete repair methods that involve heavy equipment and loud construction noises, polyjacking is a non-intrusive process. The equipment used is small and lightweight, causing minimal disruption to the surrounding area. This makes it an ideal choice for repairing structures in busy or occupied areas.

4. Long-lasting results: The expanding polymer foam used in polyjacking is waterproof and resistant to erosion, making it a durable solution for concrete repair. It creates a strong and stable base, preventing future settling or cracking of the structure. The results of polyjacking can last for many years, saving the owner from recurring repair costs.

5. Environmentally friendly: Polyjacking is an eco-friendly technique as it involves using only a small amount of material that can be easily recycled. The polymer foam used is non-toxic and does not emit any harmful substances into the environment, making it a safe and sustainable option for concrete repair.

6. Versatile: Polyjacking can be used to repair various types of concrete structures, including sidewalks, driveways, patios, parking lots, and even large industrial structures. It can also be used to level uneven floors and raise sunken foundations.

7. Precise and consistent: The foam used in polyjacking expands evenly, allowing for precise and consistent lifting of concrete structures. This ensures that the repaired structure is leveled accurately and eliminates the risk of creating new problems.

In conclusion, polyjacking offers numerous advantages over traditional concrete repair methods. It is cost-effective, time-saving, and environmentally friendly, with long-lasting results. Its versatility and precise results make it a popular choice for repairing concrete structures in various applications. As a civil engineer, it is important to stay updated on new and innovative techniques like polyjacking to provide effective and efficient solutions for concrete repair.

Disadvantages of Polyjacking

Disadvantages of Polyjacking

Polyjacking, also known as polyurethane concrete lifting, is a popular method used by civil engineers for lifting and stabilizing sunken and uneven concrete slabs. While it is a cost-effective and efficient solution, there are some disadvantages to using polyjacking that should be considered.

1. Temporary Fix: Polyjacking is considered a temporary solution as it only addresses the symptoms of the problem and not the root cause. It only lifts the concrete slab, but does not fix any underlying soil issues that may have caused the sinking in the first place.

2. Limited Applications: Polyjacking is only suitable for certain types of concrete structures, such as driveways, sidewalks, and patios. It cannot be used on larger structures like building foundations, which may require more extensive and permanent solutions like underpinning.

3. Environmental Concerns: The polyurethane foam used in polyjacking is made from non-biodegradable materials, making it harmful to the environment. In addition, the chemicals used in the foam may release harmful vapors into the air during the installation process.

4. Potential Damage: While polyjacking is a minimally invasive method compared to traditional concrete lifting methods, there is still a risk of damage to the concrete or surrounding structures during the process. This can lead to additional repair and replacement costs in the future.

5. Requires Professional Installation: Polyjacking should only be performed by trained professionals as improper installation can result in inadequate lifting or even further damage to the concrete. This adds to the overall cost of the project, as it cannot be done as a DIY solution.

6. Limited Aesthetics: Unlike traditional concrete lifting methods, polyjacking may not always result in a smooth and aesthetically pleasing finish. The foam may expand unevenly, leaving visible cracks on the surface of the concrete, which can be unsightly.

In conclusion, while polyjacking is a popular and cost-effective method for concrete lifting, it is important to consider its limitations and potential drawbacks. Engineers should carefully evaluate the specific needs of a project and consider all options before deciding on the best solution for their clients.

Difference Between Mudjacking and Polyjacking

Difference Between Mudjacking and Polyjacking

Mudjacking and polyjacking are two methods used in concrete lifting and leveling. Both techniques are used to address issues such as sunken or uneven concrete surfaces, but there are some key differences between them.

1. Material Used
The main difference between mudjacking and polyjacking lies in the material used. Mudjacking involves pumping a mixture of sand, cement, and water, commonly referred to as “slurry”, under the sunken concrete surface to lift it back to its original level. On the other hand, polyjacking uses a high-density polyurethane foam injected under the concrete to achieve the same results.

2. Installation Process
The installation process for mudjacking and polyjacking also differs. In mudjacking, holes are drilled into the concrete surface, and the slurry is pumped through these holes. The mixture fills any voids and lifts the slab back to its original position. The holes are then sealed, and the job is complete. For polyjacking, smaller and fewer holes are drilled, and the foam is injected through these holes. The foam expands, filling any gaps and compacting the soil underneath, resulting in the lifting of the concrete. The holes are also sealed once the process is completed.

3. Material Properties
One of the biggest differences between mudjacking and polyjacking is the properties of the materials used. The slurry used in mudjacking is heavier, which can cause additional stress on the already compromised soil underneath the concrete surface. This can result in future settling or sinking of the concrete. Polyjacking foam, on the other hand, is lightweight and does not exert additional pressure on the soil. It also has a faster curing time, which means that the concrete can be used sooner after the repair.

4. Effectiveness
Both techniques can be effective in lifting and leveling sunken concrete, but it depends on the severity of the issue and the underlying cause of the problem. For smaller and relatively shallow sunken areas, mudjacking can be a cost-effective solution. However, for larger and deeper voids, polyjacking is generally more effective as the foam is able to reach and fill a larger area.

5. Cost
The cost of mudjacking and polyjacking can vary depending on the size and complexity of the job. Mudjacking is generally less expensive, as the materials used are relatively cheaper. However, in the long run, polyjacking can be a more cost-effective solution as it is more durable and requires less maintenance.

In conclusion, both mudjacking and polyjacking have their strengths and are effective methods for concrete lifting and leveling. It is essential to evaluate each project’s specific needs and consult a professional to determine the best approach for a successful and long-lasting repair.


In conclusion, polyjacking is a revolutionary method for repairing sunken or cracked concrete surfaces. It offers numerous advantages over traditional methods such as mudjacking, including faster installation, longer-lasting results, and minimal disruption to the surrounding area. By injecting expanding polyurethane foam into the affected area, polyjacking provides a permanent and cost-effective solution that can improve the safety and aesthetics of any structure. Whether for residential, commercial, or industrial applications, polyjacking is a game-changing solution that is quickly gaining popularity in the construction industry. Consider using polyjacking for your next concrete repair project and experience the benefits firsthand.


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