Few things are more frustrating for a Salt Lake City homeowner than watching a section of their driveway, walkway, or patio gradually sink below its neighbors, creating an uneven surface, a tripping hazard, and an eyesore. Settlement of concrete slabs is common in the Salt Lake Valley — variable soils, irrigation water, and soil compaction over time all contribute. The question most homeowners face is: do I lift it or replace it? That’s the mudjacking vs. replacement question, and the answer depends on several factors specific to your situation.
Why Concrete Settles in Salt Lake City
Understanding why your slab settled helps determine whether lifting it will hold. The most common causes in the Salt Lake Valley include: soil erosion beneath the slab from water infiltration (a sprinkler line dripping, poor drainage from a downspout), compaction of poorly prepared fill soil over time, clay soil shrinkage during dry summers (common in parts of the valley), and root decay of trees near walkways or patios. If the underlying cause isn’t addressed, any repair — mudjacking or replacement — may ultimately fail again.
What Is Mudjacking?
Mudjacking (also called slab jacking or pressure grouting) is the process of injecting a slurry — typically a mixture of soil, water, and Portland cement — beneath a settled slab to fill voids and lift the concrete back to its original elevation. Holes are drilled through the slab at strategic locations, the slurry is pumped in under pressure, and the slab is lifted by the expanding material. Holes are then patched, and the job is complete in a few hours with the surface walkable the same day.
A newer variation — polyurethane foam lifting (sometimes called polyjacking) — uses expanding two-part foam instead of slurry. The foam is lighter, requires smaller holes, and sets faster. Several companies in the Salt Lake City area offer polyurethane lifting as an alternative to traditional mudjacking.
When Mudjacking Is the Right Choice
Mudjacking is typically the best option when: the slab is structurally sound (not cracked through or significantly spalled), the settlement is isolated to specific sections, the settlement height difference is 4 inches or less, the underlying cause of settlement can be identified and addressed, and budget is a consideration (mudjacking typically costs 25 to 50 percent less than replacement).
For Salt Lake City homeowners dealing with settled walkway sections, sunken patio corners, or misaligned driveway panels without significant cracking, mudjacking is usually an excellent solution that provides immediate results at reasonable cost.
When Replacement Is the Right Choice
Replacement makes more sense when: the slab is significantly cracked, broken, or spalled; settlement is extreme (more than 4 to 6 inches); the concrete is old and deteriorating beyond the settlement issue; multiple panels have settled and are in generally poor condition; or the underlying cause — such as a large tree root system or severely inadequate original base — makes relifting impractical.
Sometimes replacement is also the preference simply for appearance. Mudjacking patches are visible, and if your concrete is already showing its age, a fresh slab is a more satisfying long-term solution than lifting deteriorating concrete.
Cost Comparison in Salt Lake City
Mudjacking in the Salt Lake area typically runs $3 to $8 per square foot, depending on the severity of settlement and accessibility. A sunken walkway section of 50 square feet might cost $150 to $400 to lift. Concrete replacement for the same area would typically run $500 to $1,000 or more, including demolition and disposal. For larger areas, the cost difference becomes even more significant.
Polyurethane foam lifting costs slightly more than traditional mudjacking but offers the advantage of smaller holes, faster set time, and lighter fill material that won’t contribute to future settlement.
Questions to Ask Before Deciding
Before committing to either approach, ask: What caused the settlement? Is the slab itself in good condition, or does it have other issues? What is the realistic longevity of a mudjacking repair here — will it last 5 years or 15? Is there a drainage problem, tree root issue, or other underlying factor that needs to be addressed regardless of which repair approach is chosen?
Get assessments from both a mudjacking company and a concrete replacement contractor before deciding. Reputable companies in Salt Lake City will give honest recommendations even when the answer isn’t in their financial interest.
Final Thoughts
For settled but structurally sound concrete in Salt Lake City, mudjacking offers a cost-effective, fast solution that saves an otherwise good slab. For concrete that’s deteriorated beyond saving or where the settlement is severe, replacement is the appropriate investment. The right choice depends on the specific condition of your slab, the cause of settlement, and your long-term expectations for the surface. When in doubt, get two or three professional opinions before committing to either path.