Concrete Leveling
Concrete and its supporting soil settle and shift over time. If not treated properly, it can lead to expensive damage and potential safety hazards. At NCFI, we offer a suite of geotechnical polyurethanes that provide exceptional lift control and reliability for any concrete repair need.
Concrete Lifting and Stabilization
Concrete leveling — also called concrete lifting, slab jacking, or concrete raising — is a fast, minimally invasive alternative to tearing out and replacing a settled slab. Contractors inject polyurethane foam grout through small holes, typically 3/8" to 5/8". The foam expands to fill voids and densify the surface soils beneath the slab, generating the controlled lift that returns the concrete toward its original elevation. Holes are patched with non-shrink material, and most surfaces are ready for foot or vehicle traffic within about 20 minutes. NCFI formulates multiple geotechnical polyurethane foam systems for concrete leveling, each with its own reaction profile, expansion characteristics, moisture tolerance, and compressive strength. That range lets contractors match the leveling foam to the slab condition, load requirement, and site access on each project — from residential walkways and driveways to warehouse floors, pool decks, and transportation infrastructure. Selecting the right system is what keeps lift control predictable and keeps a repair from becoming a replacement.
Warning Signs of Concrete Settlement
Sinking Concrete Slabs
Sunken or uneven concrete surfaces often indicate soil settling or erosion beneath the slab, commonly caused by poor compaction or water intrusion.
Visible Cracks
Cracks—whether small hairlines or larger fissures—can signal movement or voids developing under the concrete surface.
Door and Window Misalignment
Doors or windows that stick, jam, or appear misaligned may be symptoms of foundation movement affecting the concrete slab.
Standing Water
Water pooling on or around concrete surfaces can be more than a nuisance; it often indicates low spots created by settled slabs or failing joints that allow moisture to seep underneath, further weakening the supporting soils.
Geotechnical Product Documents
Common Uses of Polyurethane for Concrete Leveling
Trip Hazard Repair
Trip hazards caused by sunken or raised concrete sections, exposed slab edges, or uneven joints present safety risks and potential legal liabilities, with the ADA defining any vertical change over ¼ inch as a hazard. Our polyurethane systems enable contractors to efficiently address uneven or cracked concrete surfaces by providing fast, reliable concrete leveling solutions that minimize disruption to properties or businesses, helping contractors deliver peace of mind to their clients.
Garage Floor Leveling
Settlement of garage floors often results from compaction or soil loss beneath the slab, creating voids and causing the slab to settle. Contractors can utilize our expanding polyurethane products to fill these voids and exert upward force, lifting garage slabs back to grade while reestablishing soil load-bearing capacity. With fast cure times and no need for excavation, our systems support contractors in delivering efficient, durable garage floor leveling solutions to their customers.
Driveway Leveling
Uneven driveways create trip and vehicle hazards and are among the most common residential jobs contractors take on. Driveway leveling foam lets a crew raise settled sections in a single visit — no excavation, no replacement pour, and the driveway is typically ready to drive on the same day. NCFI supplies contractors with polyurethane systems formulated for the lift control and cure speed these jobs demand.
Parking Lot Leveling
High-traffic concrete parking lots frequently experience settlement from poorly compacted soils or erosion, jeopardizing safety and usability. Our polyurethane solutions allow contractors to fill subsurface voids, compact loose soil, and lift slabs close to their original grade efficiently and cost-effectively. While asphalt can be more challenging, it can also be stabilized using these materials, helping contractors avoid costly full replacements and minimizing business interruption for their clients.
Rocking Concrete Slab Repair
Rocking slabs (those that shift or tilt under load) typically result from soil erosion or ground settling beneath the concrete. Using NCFI Geotechnical Polyurethanes, contractors can stabilize and realign these slabs by injecting material through the slab into the voids, restoring soil support and stopping movement. This approach safeguards high-traffic areas and equipment such as forklifts, delivering long-term slab stabilization.
Solutions for Any Project
Beyond the applications above, NCFI geotechnical polyurethane foam supports a wide range of concrete lifting and leveling work — porches, patios, sidewalks, pool decks, warehouse slabs, and foundation support among them. Tell us about the slab conditions and lift requirements on your next project and we will help identify the polyurethane system best suited to it.
- Porches and Patio Leveling
- Concrete Sidewalk Repair
- Pool Deck Leveling
- Warehouse Slab Lifting
- Concrete Foundation Repair and Leveling
The Advantages of Polyurethane in Concrete Leveling
Fast Cure Times
The quick cure times of our polyurethane systems ensure that projects can be completed quickly, reducing or eliminating downtime completely. Most projects can have foot or vehicle traffic flowing by the time the crew cleans up and is off site.
No Excavation
There’s no need to dig up or disrupt surrounding infrastructure, which reduces labor costs, project duration, and environmental impact.
Environmentally Inert
Our polyurethane systems are environmentally safe, with no leaching of harmful chemicals into soil or groundwater.
Weather Resistant
Freezing temperatures and moisture will not cause the polyurethane solution to erode or wash away.
Safety
Smooth and level walkways, driveways, and foundations are crucial in ensuring the safety and structural integrity of buildings and those who occupy them.
Made in America
NCFI polyurethane is proudly manufactured in the U.S., ensuring quality and reliability.
Real-World Results
NCFI's Geotechnical Polyurethane Systems
Our lines of mono- and multi-component polyurethane systems have a variety of densities and cure times to meet your application’s needs. Each batch meets strict testing and quality assurance standards, ensuring reliability in the field.
Dual-Component Systems
Dual-Component Polyurethane Systems by NCFI are uniquely formulated, dual component systems formulated for a variety of geotechnical applications.
Explore ProductLightweight Fill Systems
The Lightweight Fill product line is comprised of dual-component systems formulated for a variety of applications that require low exothermic heat generation for filling large voids and cavities, or building many layers quickly.
Explore ProductSingle-Component Systems
Single-Component Polyurethane Systems are a suite of permeation grouts formulated for soil stabilization, void filling, joint sealing, and soil compaction.
Explore ProductFrequently Asked Questions about Polyurethane Injection for Concrete Leveling
Polyurethane injection involves injecting expanding structural foam beneath sunken concrete slabs to lift and reestablish structural support. It offers a fast, non-invasive alternative to traditional concrete replacement.
Structures can typically bear weight within 15–30 minutes after injection. The rapid cure time makes polyurethane ideal for residential, commercial, and industrial settings requiring quick return to service.
NCFI’s polyurethane systems are used to level sidewalks, driveways, garage floors, patios, pool decks, warehouse slabs, and other load-bearing structures.
When injected properly, NCFI’s polyurethane provides a long-term solution. It is resistant to water, erosion, and environmental degradation.
NCFI formulates its polyurethane with field performance in mind. Each batch is subjected to strict quality assurance protocols and supported by decades of application data and training programs.
NCFI’s polyurethane injection offers a fast, clean, and minimally disruptive solution with precision lifting capabilities. It requires fewer crew members, less equipment, and smaller injection holes than traditional methods.
No. The injection process uses small, strategically placed holes and does not require demolition or heavy machinery, preserving landscaping and existing structures.
About Us
NCFI has been a global leader in polyurethane foam production since 1964. Seeing the ever-growing applications of polyurethane in the geotechnical stabilization market, NCFI opened the geotechnical division in 2008 in order to provide better service and products to our customers and contractors. Our foam systems are an adaptable, no-excavation solution for meeting geotechnical engineering challenges.
We Have Partnership Down to a Science
We understand the challenges you face, and we’re here to help. Reach out today, and let's work together to find the best solution tailored to your needs with the highest-quality polyurethane foam products available.