What is the difference between Mudjacking and Polyurethane Concrete Raising?
Both methods achieve the same results: raise and support sunken or unstable concrete slabs by drilling holes and pumping material under the slab.
Settled concrete is commonly a result of poor soil conditions below a slab. Because of this, Polyurethane has become a popular repair method because the material is so lightweight it will not further burden the already weak soil.
Mudjacking uses a sand-based material that is infused with Portland cement. This slurry is hydraulically pumped under the slab to fill voids and raise the concrete. Mudjacking material weighs on average 100 lbs. per cubic foot.
Polyurethane Concrete Raising uses a foam material that is injected under the slab. When the components of this material are mixed, a reaction causes the material to expand. This expanded foam fills any voids and raises concrete. This material will never lose density. After it is installed, it is permanent and weighs about 2 lbs. per cubic foot.
After concrete has been raised, the holes are the only visible evidence that the slab has been repaired. For this reason, Polyurethane has gained HUGE popularity because of the nearly invisible 5/8″ holes that remain after the job is completed.
Mudjacking involves drilling a series of 1 5/8” holes in a slab of concrete so the material can be pumped under the settled slab.
Polyurethane concrete raising drills a nearly invisible 5/8" hole and the process calls for considerably fewer holes than traditional mudjacking.
All concrete raising is typically half the cost of replacement. When large voids are present this can increase the cost of the repair. Polyurethane material is more expensive than mudjacking material, but because of the small hole size, lighter material weight, and fewer injection holes, the cost difference is worth it!