Polyurethane Foam Injection in Troy, NC

Polyurethane foam injection is a non-invasive concrete leveling technique that involves injecting expanding foam beneath the slab to lift it back to its original position. The foam fills voids, hardens quickly, and provides a durable foundation for the concrete, preventing future settlement.

Common Causes of Sunken Concrete

• Soil Erosion and Settlement – Over time, water washes away supporting soil, causing the concrete to sink.
• Poor Soil Compaction – If the ground was not compacted correctly during construction, it may settle unevenly, leading to sinking concrete.
• Heavy Traffic and Load Weight – Continuous pressure from vehicles, machinery, or foot traffic accelerates slab settlement.
• Water Infiltration and Drainage Issues – Improper drainage can lead to voids forming beneath the slab.
• Tree Root Growth – Expanding tree roots disrupt the soil and create instability under concrete surfaces.

Polyurethane Foam Injection Process

1. Small Injection Holes Are Drilled – Tiny holes (about 5/8 inches) are drilled into the sunken concrete slab.
2. Foam Is Injected Beneath the Slab – Expanding polyurethane foam is pumped into the voids, lifting the slab.
3. The Foam Hardens and Strengthens the Soil – The foam expands, stabilizing the ground and preventing further settlement.
4. Injection Holes Are Sealed – The small holes are patched, and the surface is cleaned.
5. Final Inspection for Leveling Accuracy – The repaired slab is checked to ensure precise leveling.