Concrete Leveling in Austin

Why slabs settle in Austin

On the east side, settling usually comes from clay shrinking in drought and from water washing soil out under slab edges. On the west side, it more often comes from fill: yards leveled with loose soil over uneven rock settle unevenly over the years.

Near the house, backfill against the foundation is a common culprit. Porches, walkways and driveway sections next to the garage drop as that fill compacts, especially where roof water lands.

If the concrete is still in one piece or a few large pieces, it can often be raised instead of replaced.

Leveling over fill on the west side

On Hill Country lots, builders often leveled sloping yards by pushing soil over uneven rock. That fill can be deep in one corner and only a few inches thick in another, so a walkway or patio built on it settles unevenly over the years. Voids tend to open where the fill is deepest and where water runs off the rock beneath it.

Foam lifting suits these situations well because it adds very little weight to soft fill and can be injected precisely where the void is. Before lifting, the contractor should look at where runoff from the rock is going; if water keeps flowing under the slab along the rock surface, the void will reopen. A small drain or a redirected downspout is often part of the fix.

The process

Holes are drilled in a planned pattern, and material is injected gradually while the slab is watched against a level line. The goal is a slow, controlled lift.

When the slab is level, the holes are patched and the joints sealed. Most residential jobs are finished in a few hours.

The patches remain visible as small circles, especially on colored concrete.

How to decide between leveling and replacing

Leveling is usually the better choice when the slab is in one piece or a few large pieces, the surface is in good condition and the drop is a matter of inches rather than feet. It is faster, quieter and keeps the existing concrete out of the landfill.

Replacement wins when the slab is broken into many small pieces, the surface is crumbling, the slab was poured too thin or you want to change its size or layout anyway. If a contractor recommends replacement over leveling, ask which of these reasons applies, and if they recommend leveling, ask what they will do about the cause.