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What Is Mudjacking and When Is It Used for Foundation?

Last updated October 26, 2026

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The short answer

How Mudjacking Works

Mudjacking starts with drilling small holes through the sunken concrete slab. Then a slurry mix of soil, cement, and water is pumped under pressure through those holes. The slurry fills voids and lifts the slab back to its original level. The holes are patched afterward, and the surface is left with only small marks.

The process is usually done from the outside, so you do not need to move furniture or tear up the slab. It takes a few hours for the pumping itself, but the slurry needs time to cure before you walk or drive on it. The pros will tell you how long to stay off the area.

  • Drill small holes in the slab
  • Pump slurry under pressure
  • Lift slab to level
  • Patch holes and allow cure

When Mudjacking Fits Your Home

Mudjacking is a good fit when a concrete slab has settled because the soil underneath has eroded or compacted. Common signs are a driveway that dips, a sidewalk that catches water, or a patio that slopes toward the house. If the slab is still intact and has no major cracks, mudjacking can often bring it back to level.

It is less suitable when the slab is severely cracked, broken, or has rebar exposed. It also does not fix foundation walls that are bowing or leaning. For those issues, you need a structural engineer or a foundation contractor to assess the problem. Mudjacking addresses surface settlement, not deep structural failure.

  • Driveway dips or puddles
  • Sidewalk uneven or tripping hazard
  • Patio slopes toward house
  • Garage floor settled at edges
  • Slab intact with few cracks
  • Not for cracked or bowing walls

What Causes Slabs to Settle

Slabs settle when the soil beneath them loses support. This can happen after heavy rain washes away fine soil, or when tree roots pull moisture from the ground and cause it to shrink. Poor compaction during original construction is another common cause. Over time, the void grows and the slab drops.

Water is often the trigger. A leaking pipe, poor drainage, or a downspout that dumps water next to the foundation can erode soil slowly. If you notice a slab settling, look for water problems nearby. Fixing the water source first prevents the same issue from returning after mudjacking.

  • Heavy rain erodes soil
  • Tree roots dry out ground
  • Poor compaction at build
  • Leaking pipes wash soil away
  • Downspouts direct water to foundation

Cost and What to Expect

Mudjacking costs often range from a few hundred to a couple thousand dollars, depending on the size of the slab, how far it has settled, and the accessibility of the site. The exact price depends on those specific factors, so you need a pro to look at the job and give you a number. It is generally less expensive than replacing the concrete entirely.

The work itself is messy but contained. The pros bring a truck with the slurry mix and hoses, drill holes, and pump until the slab lifts. You should clear the area of cars, furniture, or plants that might get in the way. Ask the pros how long the slurry needs to cure before you use the surface.

  • Cost depends on slab size and access
  • Clear the area beforehand
  • Slurry cures before use
  • Messy but contained process
  • Less expensive than replacement

Water Damage and Your Foundation

Mudjacking fixes the symptom of a settled slab, but it does not address the water problem that caused it. If water keeps pooling near your foundation, the soil will continue to erode and the slab may settle again. Check gutters, downspouts, and grading around the house to keep water moving away.

If you suspect a leaking pipe or water damage inside your home, handle that first. A slab that settles because of a hidden leak will only sink again after mudjacking if the leak remains. In Chapel Hill, keep your foundation dry by maintaining drainage. The pros can help with water damage cleanup if you find wet areas.

  • Check gutters and downspouts
  • Grade soil away from house
  • Fix leaks before mudjacking
  • Monitor for new settling
  • Address water damage promptly

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Frequently asked questions

How long does mudjacking last?

Mudjacking can last many years if the underlying cause is fixed. If water continues to erode soil, the slab may settle again. Regular drainage maintenance helps extend the life of the repair.

Can mudjacking fix a cracked foundation wall?

No. Mudjacking is for flat concrete slabs like driveways and patios. A cracked or bowing foundation wall needs a structural assessment and different repair methods, such as wall anchors or carbon fiber straps.

Do I need to leave my home during mudjacking?

Usually not. The work happens outside on the slab. You may need to stay off the repaired area until the slurry cures, but you can remain in the house. Ask the pros for specific cure times.

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