Introduction of Polyjacking

Introduction of Polyjacking

Polyjacking is a relatively new technique in the construction industry that has been gaining significant attention in recent years. This process involves the use of specialized polyurethane foam to lift and level concrete slabs that have settled or sunk due to soil movement or other factors. With its numerous advantages over traditional methods, such as concrete replacement or mudjacking, polyjacking has proven to be a cost-effective and time-efficient solution for many construction projects. In this article, we will explore the basics of polyjacking, its applications, benefits, and limitations, providing a comprehensive overview of this innovative technique.

Polyjacking Cost

Polyjacking Cost

Polyjacking is a method used in the construction industry to repair sunken or uneven concrete surfaces. This technology involves injecting a high-density polyurethane foam into the underlying soil to lift and stabilize the concrete slab. Polyjacking not only provides a cost-effective and efficient approach to repairing concrete, but it also helps to extend the lifespan of the structure.

The cost of polyjacking varies depending on several factors, such as the size and condition of the project, the location, and the expertise of the contractor. In general, the cost of polyjacking is significantly lower than traditional methods of concrete repair, such as excavation and replacement.

The average cost of polyjacking ranges from $5 to $8 per square foot. However, this cost can vary based on the complexity of the project. For example, if the project requires multiple injections or additional work to fix underlying issues, the cost may increase.

The location of the project also plays a significant role in determining the cost of polyjacking. Projects in urban areas with high labor and material costs may be more expensive than those in rural areas.

The expertise and experience of the contractor are also crucial factors in determining the cost of polyjacking. Contractors with extensive experience and specialized training may charge higher fees for their services. However, choosing a reputable and experienced contractor can ensure the effectiveness and longevity of the repair, saving you money in the long run.

It is essential to note that while the initial cost of polyjacking may be higher than DIY methods, it can save you money in the long term by preventing further damage and the need for costly repairs in the future.

Moreover, the cost of polyjacking is also affected by any additional services that may be required, such as post-repair cleanup or post-project evaluation. These services add to the overall cost but are necessary for ensuring a successful repair.

In conclusion, the cost of polyjacking depends on various factors, and it is crucial to get a detailed estimate from a reputable contractor before starting the project. Investing in a quality polyjacking repair can provide long-lasting results and save you money in the long run.

Process of Polyjacking

Process of Polyjacking

Polyjacking, also known as polyurethane foam injection or slabjacking, is a process used to repair and lift sunken or uneven concrete surfaces. This technique is commonly used in the construction industry to restore the integrity of concrete slabs, sidewalks, driveways, and other structures.

The process of polyjacking involves injecting a specialized polymer foam mixture into the affected area below the concrete slab. The foam mixture expands and hardens, creating pressure that lifts the concrete to its original level.

The following are the steps involved in the process of polyjacking:

1. Site Preparation: Before starting the polyjacking process, the site must be prepared properly. This includes removing any debris or obstacles from the work area and ensuring that there are no underground utilities or pipes. The area also needs to be marked to indicate the areas where the foam will be injected.

2. Drilling Holes: Next, small holes are drilled into the concrete slab at strategic locations. These holes are typically 5/8 inch in diameter and are placed about 3 feet apart. The number of holes and their placement depends on the size and condition of the slab.

3. Creating the Foam Mixture: A specialized polyurethane foam is then mixed according to the manufacturer’s instructions. This mixture contains a two-part liquid component that reacts and expands when combined. The mixture is typically prepared in a mobile mixing unit or onsite using portable equipment.

4. Injecting the Foam: Once the foam mixture is ready, it is pumped through the previously drilled holes at a high pressure. The foam expands and fills any voids and gaps beneath the concrete slab, creating pressure that lifts the slab.

5. Monitoring and Adjusting: As the foam expands, the technician will continuously monitor the process and make adjustments as needed to ensure even lifting. Once the slab has reached the desired level, the foam is allowed to cure and harden for about 15 minutes.

6. Sealing Holes and Clean Up: After the foam has cured, the drilled holes are sealed with cement or grout. Any excess foam that may have leaked out during the process is removed and the area is cleaned up.

The entire process of polyjacking usually takes a few hours, depending on the size and condition of the concrete slab. Once complete, the repaired concrete is ready for use immediately.

In conclusion, polyjacking is an effective and efficient method for repairing sunken or uneven concrete surfaces. It is a less intrusive and more cost-effective solution compared to traditional methods such as replacing the slab. It is important to hire a professional and experienced polyjacking company to ensure the best results.

Advantages of Polyjacking

Advantages of Polyjacking

Polyjacking, also known as polyurethane concrete lifting, is a specialized technique used in civil engineering to repair and stabilize concrete structures. It involves injecting a specially formulated expanding polymer foam into the voids and void spaces beneath sunken, cracked or uneven concrete slabs. Here are some of the major advantages of using polyjacking in construction projects:

1. Quick and Efficient Repair: Polyjacking is known for its speed and efficiency. The process of injecting the polymer foam and lifting the concrete slab can be completed within a matter of hours, minimizing disruptions to traffic and business operations. This makes it an ideal solution for projects that have tight timelines or need to be completed quickly.

2. Cost-effective: Polyjacking is a cost-effective method compared to traditional concrete repair methods such as demolition and replacement. The materials used in polyjacking are relatively inexpensive and the process requires minimal labor, resulting in cost savings for the project.

3. Minimal Disruption: Traditional concrete repair methods involve a lot of heavy equipment, resulting in a lot of noise, dust and debris. Polyjacking, on the other hand, is a relatively quiet process with no demolition required. It causes minimal disruption to the surrounding area, making it a suitable method for repairs in busy urban areas or inside buildings.

4. Lightweight: The polymer foam used in polyjacking is lightweight, which means it exerts little to no pressure on the weak soils beneath the concrete slab. This eliminates the risk of further settlement or damage to the structure, making it a long-term solution.

5. Versatility: Polyjacking can be used to repair a wide range of concrete structures, from roads, bridges, and parking lots to sidewalks, driveways, and foundations. It is also suitable for both residential and commercial projects, making it a versatile solution for any type of concrete repair.

6. Environmentally Friendly: The polymer foam used in polyjacking is an environmentally friendly material. It is non-toxic, does not release harmful chemicals into the environment and is safe for use in any setting.

7. Minimal Maintenance: Once the repair is completed, the injected polymer foam hardens, forming a strong and stable base for the concrete slab. The foam is resistant to water, chemicals, and erosion, ensuring the long-term stability of the repaired structure without the need for regular maintenance.

In conclusion, polyjacking offers a wide range of benefits that make it a preferred method of concrete repair in civil engineering projects. Its speed, cost-effectiveness, and minimal disruption make it an attractive option for various construction projects. It is environmentally friendly, versatile, and requires minimal maintenance, making it a sustainable solution for repairing concrete structures.

Disadvantages of Polyjacking

Disadvantages of Polyjacking

Polyjacking, also known as polyurethane concrete lifting, is a method used to raise or stabilize sunken or uneven concrete surfaces by injecting expanding polyurethane foam underneath the concrete. While this technique has gained popularity in recent years, it also has some disadvantages that should be considered before using it.

1. Limited lifespan: Polyjacking is a temporary solution to the problem of sunken or uneven concrete. The polyurethane foam used in this process can break down or deteriorate over time, leading to the need for repeat applications. This can be a disadvantage when compared to other methods such as concrete replacement, which can last for decades.

2. Not suitable for all types of concrete: Polyjacking is most effective for raising and stabilizing concrete slabs such as driveways, sidewalks, and patios. It is not suitable for more complex structures like bridges, which require specialized methods for repair.

3. Potential for environmental hazards: The polyurethane foam used in the polyjacking process is a chemical mixture that can release toxic fumes when heated. It can also be harmful if it comes in contact with the skin or eyes. This poses potential environmental and health hazards for both the workers and the surrounding area.

4. Limited structural support: While polyjacking can help level out and raise sunken concrete, it does not provide the same structural support as a new concrete slab. This may be a concern in areas with heavy traffic or heavy equipment use.

5. Cost: Although polyjacking is generally less expensive than concrete replacement, it can still be a significant expense. Additionally, if the polyurethane foam fails after a few years, it may end up being a more costly solution in the long run.

6. Limited DIY options: Unlike some other methods of concrete repair, polyjacking requires specialized equipment and training, making it difficult for a DIY approach. This means that the repair must be done by a professional, which can add to the overall cost.

In conclusion, while polyjacking can be an effective method for repairing sunken or uneven concrete, it also comes with its share of disadvantages. It is important to carefully consider these factors before deciding on the best solution for your concrete repair needs. Consulting with a professional is always recommended to determine the most suitable and cost-effective option for your specific situation.

Difference Between Mudjacking and Polyjacking

Difference Between Mudjacking and Polyjacking

Mudjacking and polyjacking are two common methods used in civil engineering for repairing sunken or uneven concrete surfaces. Both techniques involve the injection of a material, either mud or polyurethane, underneath a slab of concrete to raise it back to its original position. While the goal of both methods is the same, there are significant differences in the process, materials, and results.


Mudjacking, also known as slabjacking or concrete lifting, involves drilling holes into the affected concrete slab and pumping a mixture of water, soil, and cement mixture (mud) through the holes. As the mixture fills any voids and compresses the soil, it lifts the concrete slab back to its original position. On the other hand, polyjacking uses polyurethane foam, a liquid polymer that expands when injected into the soil, lifting the concrete slab.


As mentioned earlier, mudjacking uses a mixture of water, soil, and cement to raise the sunken concrete, making it a less expensive option than polyjacking. However, the presence of water in the mixture can sometimes lead to erosion and further soil settlement, reducing the longevity of the repair. In contrast, polyjacking uses a high-density polyurethane foam, which is lighter and stronger than mud, reducing the stress on the soil and providing a more permanent solution.


Mudjacking and polyjacking can both effectively lift concrete slabs, but they differ in the speed and scope of the repair. Mudjacking is generally a quicker process, with the concrete surface usually ready for use within 24 hours. This method is more suitable for smaller, less complicated repair jobs. On the other hand, polyjacking may take longer to cure, but it provides a more thorough and precise result, making it a better option for larger or complex concrete repairs.

Environmental Impact:

The materials used in mudjacking and polyjacking have different environmental impacts. The use of cement in mudjacking results in carbon dioxide emissions, making it less environmentally friendly compared to polyjacking, which uses non-toxic, non-hazardous polyurethane foam.


Mudjacking is generally more cost-effective than polyjacking, making it a popular choice for smaller repair projects. However, the cost of polyjacking may be justified in the long run due to its more permanent and precise results.

In conclusion, while both mudjacking and polyjacking are effective methods for raising sunken or uneven concrete surfaces, they differ in the process, materials, results, environmental impact, and cost. It is essential to evaluate the specific needs of the project and consult a professional to determine the most suitable method for the repair.


In conclusion, the introduction of polyjacking has greatly revolutionized the field of foundation repair. With its numerous benefits such as cost-effectiveness, minimal disruption, and quick turnaround time, polyjacking is quickly becoming the preferred method for foundation stabilization and leveling. While traditional methods like mudjacking and concrete replacement have their own merits, the numerous advantages of polyjacking make it a clear choice for homeowners and contractors alike. As technology continues to advance, we can only expect further improvements and advancements in this innovative technique. Polyjacking is undoubtedly the future of foundation repair and it is exciting to see how it will continue to transform the construction industry in the years to come.

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