Mudjacking generally uses a cementitious slurry to fill voids and lift some slabs. Polyurethane lifting injects expanding foam. Neither method should be selected from a marketing label alone; the condition, thickness and integrity of the concrete control suitability.
How slurry and foam lifting differ
Both lifting systems act through small injection points, but the injected materials have different behavior. Slurry-based systems place a cementitious material below the slab. Polyurethane expands after injection, and the operator must control lift rate and the amount introduced. Important differences include injection-hole size, material density and added weight, void geometry, water conditions, achievable lift control and when the treated surface can return to service. A contractor should explain which factor is driving the choice for the actual slab rather than imply one material always wins.
Which slabs can be lifted and which need replacing
Both methods act on support below an intact slab. An intact driveway panel beside a garage may be liftable if the geometry allows adjustment without cracking it. A slab fractured into unstable pieces generally needs replacement rather than lifting; neither method reconstructs severely fractured concrete.
If the low area formed because runoff eroded bedding, raising it without correcting the water path can leave a repeat problem. The evaluation should cover both support and drainage; neither procedure is a warranty against future soil movement.
Controlling the lift and protecting nearby joints
It is worth asking the contractor how the slab will be monitored during lifting. Both techniques can alter adjacent joints and sometimes expose cracks that were already stressed. The aim is a workable safe elevation, not a promise to make the entire driveway mathematically flat. If one corner needs more adjustment than another, the method and material placement should be described in the scope. Where nearby utilities, drains or fragile concrete edges exist, access and injection planning may influence the recommended method more than an advertised material characteristic.
Related repair services and reading
For the applicable offered service, see the parent service page. Related information includes Repair choices · Concrete repair · Asphalt repair · Driveway drainage. Use the condition assessment to organize the symptoms and request an estimate when a project needs evaluation.
Common questions about mudjacking vs polyurethane foam lifting
Which costs less, mudjacking or polyjacking?
It depends on the job rather than the method name. The size of the void, the number of slabs, access for equipment and how much lift is needed all change the price, and the two materials are priced differently. The fair comparison is two quotes for the same slabs, the same target elevation and the same drainage work.
A lower price that leaves the water problem untouched may cost more if the slab drops again.
Does foam lifting leave smaller holes in the driveway than mudjacking?
Generally yes. Polyurethane is injected through smaller holes than most slurry systems need, because the foam travels and expands after it is placed. Mudjacking pumps a heavier slurry and usually needs larger holes. Either way the holes are patched afterward, and patches on weathered concrete are often visible.
Ask how many holes are planned and how they will be filled before choosing.
How soon can I drive on a driveway slab after it has been lifted?
It varies by material. Polyurethane foam sets quickly, so a lifted slab can often return to use sooner, while a cementitious slurry needs time to harden before it carries a vehicle. Weather and the amount of material placed also matter. The contractor should give a specific return-to-use time for your slab in writing.
Keep heavy vehicles off the edges until the contractor clears them, whichever method is used.