Voids beneath concrete slabs are one of the most common causes of sinking or uneven concrete. When the soil under a slab erodes or washes away, empty spaces can form beneath the concrete surface.
These voids weaken the support structure beneath the slab, causing the concrete to crack, sink, or become unstable.
Northwest Concrete Leveling provides professional void filling and soil stabilization using advanced polyurethane foam injection. This process fills empty spaces beneath the concrete while strengthening the soil to prevent further settlement.
In many cases, void filling can stabilize concrete surfaces without the need for full slab replacement.
Voids can develop under concrete slabs for several reasons, often related to soil movement or water drainage.
Common causes include:
As soil shifts or washes away, empty spaces can form beneath the concrete slab.
Northwest Concrete Leveling uses a polyurethane foam injection process to fill voids and stabilize the soil beneath concrete slabs.
We inspect the concrete surface and surrounding area to identify voids and determine the cause of soil loss.
Small holes are drilled into the slab where the foam will be injected.
Structural polyurethane foam is injected beneath the slab where it expands to fill empty spaces and stabilize the soil.
The foam hardens quickly, providing strong support for the concrete above.
Polyurethane foam stabilization offers several advantages compared to traditional repair methods.
• Quickly fills empty spaces beneath slabs
• Lightweight but extremely strong material
• Long-lasting soil stabilization
• Minimal drilling and disruption
• Fast installation
• Ready for use shortly after repair
This method provides a reliable solution for stabilizing concrete surfaces and preventing future settlement.
Void filling can be used to stabilize many types of concrete surfaces, including:
• Driveways
• Sidewalks and walkways
• Garage floors
• Patios and pool decks
• Warehouse floors
• Commercial concrete pads
If the soil beneath these surfaces becomes unstable, void filling can restore support and prevent further damage.
Void filling is a process that fills empty spaces beneath concrete slabs to restore support and stabilize the structure.
Many commercial repairs can be completed within a few hours depending on the size of the project.
Yes. In many cases the expanding foam both fills the void and gently lifts the concrete slab back into position.
Yes. In most cases void filling is significantly less expensive than removing and replacing concrete slabs.
Contact Northwest Concrete Leveling today to schedule your free inspection and estimate.
Concrete Leveling & Polyurethane Foam Injection Services in Kennewick, Pasco, Richland, West Richland, and surrounding Tri-Cities communities.
© 2026 Northwest Concrete Leveling. All rights reserved.