Polyjacking (also known as polyurethane concrete raising, polyurethane concrete leveling, and foam lifting) is the process of fixing sinking concrete, by injecting polyurethane foam into the void underneath the slab.
This sinking concrete repair method uses the slab itself as a means of delivering polyurethane material that raises concrete, fill voids, and stabilize soils.
A small hole is drilled through the slab into the subgrade. A tapered delivery port is installed into the hole. Raising concrete with polyurethane foam is done with incremental injections. Lifting foam will fully expand within 10-15 seconds allowing you to monitor the raising and preventing over raising the slab. The injection gun delivers the polyurethane material through the port and slab. Expansion of the material occurs within seconds, compressing loose soils and raising concrete.
Residential and Commercial Applications
Repairing A Driveway
Polyjacking is more efficient, more economical, and faster to complete than other concrete raising methods. It is used in many applications including:
- Airport runway leveling
- Bridge approach void filling
- Concrete step repair
- Curb leveling
- Driveway leveling
- Garage floor leveling
- Heavy machinery stabilization
- Highway leveling
- Interior floor stabilization
- Pavement lifting
- Patio lifting
- Pool deck leveling
- Road leveling
- Sidewalk leveling
- Soil stabilization
- Void filling
- Warehouse floor leveling
When compared to concrete replacement, the process of raising concrete with polyurethane foam is inexpensive. Polyjacking is also exponentially faster than replacing concrete.
Polyjacking vs. Traditional Mudjacking
Mudjacking uses a grout based material infused with mud and cement. It involves drilling a series of 1” or bigger holes in a slab of concrete so the material can be pumped under the settled slab. It is hydraulically pumped under the slab to fill in voids and raise the concrete back to level.
Polyjacking uses a polyurethane foam material that is injected beneath the concrete. Foam jacking drills a nearly invisible 5/8” holes, requiring fewer holes than traditional mudjacking. When polyurethane material and water is mixed, it expands and fills in the voids underneath the slab. The polyurethane material’s density always remains intact.