Uneven Concrete: Common Causes

If the ground under the slab compresses or shifts, the concrete follows. This is one of the most common reasons for uneven sections.

Soil shrinks and expands with moisture. Over years, that movement can leave slab sections at different heights.

Water washing base material out from under a slab creates voids. The slab either drops into them or cracks under its own weight.

Tree roots can lift sections of concrete, especially on walkways and edges of driveways.

Loads beyond what a slab was designed for can cause localized settlement.

Any fix that ignores the underlying cause tends to fail again. Drainage, base repair, or root management may all be part of a real solution.