A sunken slab is one of those problems you feel before you fully notice it. Your foot catches the edge, the trash bin wobbles, water starts pooling where it never used to, and suddenly the walkway looks “off.” In Cincinnati, soil movement and freeze-thaw cycles can make settling more common than homeowners expect. The good news is that you often have options besides tearing everything out, but the right fix depends on why the slab moved and how much damage is already present. A trustworthy concrete contractor will focus on the cause first, then match you with the best solution.
Why does concrete settle in the first place
Concrete is strong, but it is only as stable as what is underneath it.
Soil and moisture changes
Many properties deal with soil that expands when wet and shrinks when dry. Add poor drainage, downspouts dumping near the slab, or a low spot that holds water, and the base can wash out or soften over time. When the support disappears, panels drop.
Freeze-thaw and water under the slab
Water that sits below concrete can freeze and push, then thaw and leave voids. Over repeated seasons, that movement can create uneven joints and trip edges.
Poor compaction during the original install
If the base was not compacted well, the slab may settle gradually. This shows up often in older sidewalks, driveway approaches, and spots where soil was disturbed during utility work.
A concrete contractor should be able to explain which of these is most likely on your property, because the fix is different for each.
What “concrete leveling” actually means
Concrete leveling is the process of lifting a settled slab back toward its original position, usually by injecting material beneath it to fill voids and raise the panel. The goal is a safer surface, better drainage, and a smoother transition between sections.
Leveling can be a great fit for sidewalks, walkways, patios, and driveway panels, as long as the slab is still structurally sound. A skilled concrete contractor will check for cracks, edge breakdown, and underlying instability before recommending lifting.
Option 1: Mudjacking
Mudjacking, also called slab jacking, uses a cement-based slurry pumped under the slab through small holes. The pressure lifts the concrete as the material fills voids.
Pros of mudjacking
- Often more budget-friendly than other lifting methods
- Uses a heavier, cement-based material that can be very stable
- Can lift larger slabs when conditions are right
Cons of mudjacking
- The material is heavier, which can be a drawback on weak soils
- Injection holes are typically larger than the foam methods
- Results depend heavily on proper drilling pattern and compaction control
Mudjacking is often chosen when a homeowner wants a practical fix, and the site conditions support the weight of the slurry. A reliable concrete contractor will also look at drainage so the same void does not form again.
Option 2: Polyjacking
Polyjacking uses expanding polyurethane foam injected under the slab. The foam expands, fills voids, and can lift the concrete with less added weight.
Pros of polyjacking
- Lightweight material, helpful when soil support is questionable
- Smaller injection holes
- Often cures quickly, meaning faster return to use
- Good at filling voids and stabilizing surrounding areas
Cons of polyjacking
- Can be more expensive than mudjacking
- Requires precision; too much lift, too fast, can create misalignment
- Not every slab is a good candidate, especially if it is badly cracked
Polyjacking is popular for trip hazard repairs and areas where minimizing added weight matters. A concrete contractor who offers this should explain how they control the lift and how they verify the final slope for drainage.
Option 3: Full replacement
Sometimes replacement is simply the smarter long-term move.
When replacement makes more sense
- The slab is broken into multiple pieces or has major structural cracking
- Edges are crumbling, spalling, or flaking deeply
- The base is failing across a wide area, not just one panel
- The slope is wrong and needs a complete regrade
- You want a redesign, wider paths, a new layout, and new finishes
If you replace, you get the chance to rebuild the base correctly, set proper joint spacing, and correct drainage from the start. A good concrete contractor will be honest when lifting would only buy a short amount of time.
A simple way to choose the right option
If you are deciding between mudjacking, polyjacking, and replacement, focus on these questions.
Is the slab still in one solid piece?
If the slab is mostly intact with limited cracking, leveling can be a strong option. If it is heavily fractured, replacement usually wins.
Is the problem isolated or widespread?
One low panel is a different situation from an entire walkway that is sinking. The more widespread the movement, the more you should consider replacement and drainage correction.
Is water part of the problem
If downspouts dump near the slab, or water pools along edges, fix drainage first. Otherwise, any lifting method can be temporary. A practical concrete contractor will talk about water management as part of the plan.
How long do you need the fix to last
If this is a long-term home and you want a “done once” result, replacement may be worth it. If the slab is in good shape and you want a cost-effective improvement, leveling may be perfect.
What to ask before you hire
These questions help you avoid guesswork.
- What caused the settling, and how will we prevent it from returning
- Which method fits this slab, and why
- What results can I expect for slope and drainage after lifting
- Will there be visible holes, and how will they be patched
- What is the realistic lifespan of this fix for my situation
A clear answer here is a strong sign that you are working with the right concrete contractor.
Work with Cincinnati Concrete Custom
If you are dealing with uneven sidewalks, sunken patio panels, or a driveway section that no longer drains correctly, Cincinnati Concrete Custom can evaluate the slab, explain your options, and recommend the most sensible path forward. When you want a concrete contractor who prioritizes safety, clean transitions, and long-term stability, you can start by reviewing their concrete contractor services and requesting an estimate.
Next in the series
To loop back to the start of this silo, read Stamped Concrete Patios: Patterns, Colors, and Real Pros and Cons next, especially if you are planning a backyard upgrade and want the look to match the practicality.