Concrete repair has seen many innovations over the years, but none have proven as transformative as polyurethane foam. This material, once primarily used in insulation and packaging, is now leading the way in concrete leveling and slab repair. Its versatility, durability, and efficiency make it a game-changer for residential and commercial construction projects alike.
Unlike traditional repair methods, polyurethane foam offers a clean, fast, and long-lasting solution. Through a process known as foam injection, it is injected beneath sunken concrete slabs, where it expands and hardens, lifting the surface and stabilizing the ground underneath. The result? A level, stable slab without the need for demolition or messy concrete replacement.
What Is Polyurethane Foam and How Is It Made?
Polyurethane foam is a synthetic material made by mixing two main chemical components: a polyol and an isocyanate. When combined, these substances react and expand into a foam, which can vary in density and flexibility depending on its intended use. The version used in concrete repair is a high-density, closed-cell foam that’s designed to expand quickly, fill voids, and support heavy loads.
This chemical reaction happens on-site, often within seconds, making it ideal for construction environments where speed and precision matter.
What Is Polyurethane Foam Used For?
Polyurethane foam has a wide range of applications. In construction, it’s used for concrete lifting, insulation, waterproofing, and soundproofing. In the automotive and furniture industries, it provides padding and structural support. Its lightweight nature and strong compressive strength make it a top choice for soil stabilization and foundation repair, especially when working in areas with unstable subgrade.
When used in foam injection for concrete repair, the foam flows into gaps beneath the slab and expands, raising it back to its original position while also compacting the soil below.
Is Polyurethane Foam Safe or Toxic?
One of the most common questions is: Is polyurethane foam toxic? The answer depends on how it’s used. In its liquid form, the chemicals can be hazardous and should only be handled by professionals using proper safety gear. However, once the foam cures and hardens (usually within minutes), it becomes non-toxic, inert, and safe.
It doesn’t off-gas harmful fumes and is considered safe for both indoor and outdoor use when applied correctly. This makes it a practical choice for everything from driveway leveling to warehouse floor repair.
Is Polyurethane Foam Waterproof?
Yes, polyurethane foam is waterproof, especially the closed-cell variety used in concrete applications. Its water resistance is one of the key reasons it’s so effective in preventing soil erosion and avoiding water intrusion beneath concrete slabs. By sealing gaps and voids, it helps protect foundations and keeps moisture from weakening the ground.
This waterproof quality also makes it perfect for repairing slabs in wet environments like basements, patios, or regions prone to rain and frost.
Can You Wash Polyurethane Foam?
While polyurethane foam used in cushions or insulation can sometimes be washed gently, the high-density foam used in concrete repair doesn’t require cleaning nor should it be exposed to unnecessary abrasion or chemicals. Once it’s injected and cured under a slab, it remains untouched and stable for years. It’s maintenance-free and highly durable, which is exactly what makes it ideal for long-term structural support.
The Bottom Line
As construction continues to evolve, polyurethane foam is proving to be one of the most effective materials for concrete lifting, soil stabilization, and foundation repair. It’s fast-acting, safe when installed correctly, waterproof, and incredibly strong. Whether you’re repairing a sunken sidewalk or reinforcing a commercial floor, polyurethane foam delivers unmatched results making it the future of modern concrete repair.
Contact Kaplan Concrete for Advanced Foam Injection Services
At Kaplan Concrete, we use high-performance polyurethane foam injection to restore your concrete surfaces quickly and efficiently. Our experienced team works across Eagan and surrounding areas to provide long-lasting concrete solutions for homes and businesses alike.
Reach out today for an inspection or estimate. Let us show you how modern materials and expert techniques can transform your concrete problems into permanent solutions.
