Mudjacking, also called slab jacking or concrete leveling, is the process of hydraulically pumping material below a sunken concrete slab to raise it back to it’s original level.  The material is a slurry of limestone or sand, cement and water.  Sometime soils are used to reduce costs, hence the name “mudjacking”. The ratio and type of material varies from each mudjacking contractor.


The raw materials are transported to the jobsite and mixed onsite.  Once the mixture has been made, it’s dumped into a cart which is then moved to the location that needs to get raised.  The process involves pumping the material into holes that are drilled into the slab.  After the concrete has been raised and leveled the holes are patched and the area gets washed to remove excess material.  Mudjacking is a low cost method to repair sunken slabs but it does have it’s draw backs, which are listed below:


Problems with Mudjacking

  • Ugly Holes:  In order to pump the thick slurry below the slab, many 1”- 2” pop can size holes are needed.  Many homeowners complain about the appearance of their concrete after it’s been mudjacked. 

  • Heavy Material: Weighing around 100lbs per cubic foot, the heavy slurry puts more burden on an already weak base which can cause further settling.

  • Shrinking and Washouts: The slurry is made of organic materials that can shrink and wash away overtime.

  • Messy and Cumbersome Process: Mudjacking is not an easy or clean process.  This makes it difficult for indoor work such as basements, office or warehouse floors.

  • 24 hour Cure Time:  Mudjacking requires at least 24 hours before it can be driven on.


Polyjacking Concrete Raising - The New Mudjacking Alternative

Using high-density polyurethane expanding foam to raise concrete was invented to achieve the same results without the problems associated with mudjacking.   Instead of hydraulic force, polyurethane concrete raising uses the expanding force of mixing two polymers to raise and level concrete. First introduced in the 80’s, it was specifically used for raising and stabilizing highways and bridges. The technology is similar to spray foam insulation systems used in homes, with modifications to the spray gun and polyurethane. As the material and equipment costs have lowered throughout the years, it is now an effective and viable alternative to mudjacking to raise and level concrete in the residential and commercial market because of the many aesthetic, performance and convenience benefits.  Learn More

Key Benefits to Polyjacking

  • Smaller Holes - 5/8" compared to 1"-2" with mudjacking
  • Less Holes - Since it's starts as a liquid it can cover more area below the slab when injected, which means it requires less holes to be drilled compared to mudjacking.
  • Lighter Material - Drastically lighter material means less force on base.
  • Long Lasting - High density polyeruthane does not hold moisture which means it will not shrink or wash away, unlike mudjacking.
  • Fast Cure Time - Only 15 minutes is needed before concrete can be used, mudjacking requires 24 hours.

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