Voids form when soil beneath concrete washes out, erodes, or settles unevenly. These hidden gaps can exist for months or years before visible damage appears. Over time, voids weaken slab support and often lead to sinking concrete, cracking, and drainage issues.
Foamjection addresses these problems with targeted void filling. By injecting high-density polyurethane foam beneath the slab, we fill empty space, displace trapped water, and stabilize weak soil — all without removing concrete or disturbing the surface above.
Void filling is often used as a preventative repair or combined with concrete leveling to help ensure long-term stability.
Eco-friendy, fast, effective, affordable.
Voids develop over time due to changes below the surface. Common causes include:
Left untreated, voids grow larger and increase the risk of sudden slab failure.
Void filling is effective under many concrete surfaces, including:
Void filling can also be performed as a standalone service or combined with slab lifting when needed.
Foamjection stabilizes concrete by filling hidden voids beneath the slab with high-density polyurethane foam. Instead of removing concrete, the foam is injected below the surface where it expands to fill empty space, restore soil support, and prevent further settlement. When needed, the process can also provide controlled lifting.
Most void filling projects are completed efficiently, and in many cases, the concrete is ready for use the same day.
Uneven concrete poses substantial hazards that can result in serious injuries. Addressing and repairing uneven concrete promptly is essential to ensure safety and mitigate potential risks.
Concrete lifting creates a smooth, level surface by filling low spots, offering a quick and eco-friendly solution that reduces risks and saves money.
You may have voids under your concrete if you notice:
Addressing voids early helps prevent larger and more costly repairs.
Polyurethane foam is designed to perform below the surface. Key advantages include:
Unlike traditional fill materials, the foam does not wash out or break down in wet conditions.
Void filling is a process that fills empty space beneath concrete using polyurethane foam. It restores support under the slab and helps prevent sinking or cracking.
Voids form when soil washes away due to water flow, poor drainage, soil movement, or plumbing leaks. Water flowing beneath a slab slowly carries soil away, leaving empty space behind. Over time, this loss of support causes concrete to settle.Â
The foam is injected beneath the concrete where empty space exists. As it expands, it fills the void and creates firm support under the slab.
Void filling focuses on stabilizing the soil and filling empty space. In some cases, minor lift may occur, but the primary goal is to restore support and prevent future movement. If lifting is needed, void filling is often combined with concrete leveling.
No. Polyurethane foam is water-resistant and does not dissolve or wash away once it cures.
Most void filling projects are completed quickly, often within a few hours depending on the size of the voids. Treated areas are stable immediately after installation.
Yes. Once cured, the foam becomes a stable material beneath the slab. It is waterproof, does not leach into soil, and is designed for long-term underground use.
No. The process uses small access points drilled through the concrete or soil. There is no excavation, heavy equipment, or removal of surrounding soil, which helps protect nearby landscaping and structures.
Void filling is used under driveways, sidewalks, patios, garage floors, interior slabs, and commercial concrete surfaces.
Signs include hollow sounds, visible gaps under slab edges, sudden settling, or water draining under concrete. An inspection helps confirm if voids are present.
Foamjection helps homeowners with expert foam concrete leveling throughout.
Foamjection is the nationwide leader in polyurethane concrete lifting—powered by HMI. Backed by 50+ years of expertise, 20,000+ customers served, and a proven national system, we help homeowners across the U.S. fix sinking concrete using advanced foam injection for long-term stabilization. From uneven walkways and driveways to patios and garage floors, our process delivers reliable concrete repair while helping homeowners save up to 70% compared to replacement.
Looking for a fast, affordable alternative to tearing out concrete?
