How to Fix a Sinking Sidewalk
A sinking sidewalk is not only unsightly but also a safety hazard, increasing the chances of someone tripping on the uneven pavement. This issue arises because exterior concrete is constantly shifting due to natural factors like:
- Soil settling over time.
- Moisture fluctuations, causing soil to expand or shrink.
- Frost heave in colder climates, which lifts and disrupts concrete slabs.
The Problem with Full Replacement
Replacing a sidewalk or driveway involves tearing out, hauling away, and installing new concrete. This process is not only expensive but also harmful to the environment, as the old concrete typically ends up in a landfill.
However, if the concrete is in “pretty good shape”—meaning it consists of large, sturdy pieces and has a smooth, solid surface—you can skip the costly and destructive replacement process.
The Mudjacking Alternative
Mudjacking, or concrete leveling, is an efficient and cost-effective way to restore sunken pavement. This method costs about one-third of a full replacement and involves the following steps:
- Drilling Holes: The contractor drills small holes in the concrete slab.
- Pumping Slurry: A mixture, typically made of ground stone or cement slurry, is pumped under the slab.
- Re-leveling: The pressure raises the concrete back into position.
- Filling Voids: Additional holes are used to fill any remaining voids beneath the slab.
- Patching: A concrete mix is applied to patch the holes flush with the surface for a smooth finish.
