Why Concrete Sinks

Understanding the real reason driveways and sidewalks settle.

Concrete Does Not Usually Fail — The Soil Beneath It Does

Concrete is extremely strong, but it relies on stable soil underneath to support it.

When the soil beneath a slab shifts or erodes, the concrete begins to settle into the empty space.

This is why homeowners often see:

• Uneven sidewalks
• Sunken driveways
• Garage floor separation
• Patio slabs that slope toward the house

Common Causes

The most common causes of sinking concrete include:

Soil erosion from rain or irrigation
Poor soil compaction when the home was built
Dry soil shrinking during drought
Freeze and thaw cycles
Water draining under the slab

How Concrete Lifting Works

Modern concrete lifting uses expanding polyurethane foam injected beneath the slab.

The foam fills empty spaces, stabilizes the soil, and lifts the concrete back to its original level.

This process is fast, clean, and far less expensive than replacing the concrete.