Why Voids Under Your Concrete Are Dangerous and How Foam Injection Fixes Them

If you’ve noticed your concrete beginning to sink or crack, there’s a good chance a void has formed beneath the surface. These hidden gaps can compromise the stability of your slab and lead to costly structural damage if not addressed quickly.

At Airlift Concrete Experts, we specialize in identifying and filling voids under concrete slabs using advanced polyurethane foam injection. This process stabilizes the soil, supports the slab, and prevents future settlement—all without tearing out your concrete.

What Causes Voids Under Concrete?

Voids typically form when the soil beneath your slab shifts, erodes, or compacts unevenly. Over time, that creates empty spaces where the concrete loses support. Some common causes include:

• Erosion from rainwater or poor drainage washing away soil
• Soil shrinkage during dry weather or drought
• Poor compaction during construction
• Burrowing animals or decaying organic material underground
• Leaking plumbing or irrigation systems saturating and weakening soil

These issues can happen under any concrete surface—driveways, patios, pool decks, garage floors, or even interior slabs.

Why Voids Are a Serious Problem

At first, a small void may not look like much. But as it grows, the concrete above begins to settle unevenly. That leads to:

• Cracked or uneven slabs that worsen over time
• Tripping hazards on sidewalks or walkways
• Water pooling and drainage issues
• Stress on your foundation or attached structures
• Decreased property value and potential safety risks

If ignored, the void can expand to the point that the concrete fractures or collapses completely—leaving a much bigger and more expensive problem.

How Foam Injection Fixes Voids Under Concrete

Instead of removing and replacing your concrete, Airlift uses polyurethane foam injection, a fast, clean, and long-lasting solution.

Here’s how it works:

1. Inspection: We identify the affected areas and determine the size of the void.
2. Drill small holes: Tiny access holes (smaller than a dime) are drilled in the concrete surface.
3. Inject expanding foam: A two-part polyurethane foam is injected beneath the slab. As it expands, it fills the void completely, compresses weak soil, and lifts the slab back into place.
4. Finish and clean up: The holes are patched, and your surface is ready to use within hours.

This process not only fills the void but also stabilizes the ground beneath it, preventing future settlement.

Benefits of Foam Injection vs. Mudjacking or Replacement

• Lightweight: Won’t add extra stress to weak soil
• Waterproof: Won’t wash out or erode over time
• Fast results: Most projects are completed in a few hours
• Precise: Can lift concrete back to exact height
• Clean: No heavy equipment or demolition needed

Protect Your Property with Airlift Concrete Experts

Voids under concrete don’t fix themselves—and the longer they’re left untreated, the more damage they can cause. With Airlift Concrete Experts, you’ll get a permanent, professional fix using the latest polyurethane technology.

Whether it’s your driveway, sidewalk, foundation, or even a grain bin floor, our team can fill the voids, stabilize the soil, and restore your concrete quickly and safely.

Contact Airlift Concrete Experts today for a free inspection and estimate. We’ll help you identify what’s happening beneath your slab and provide a lasting solution before the damage gets worse.