Void Filling
Stabilize Concrete from Below—No Excavation Required
Hidden voids beneath concrete are a common cause of sinking, cracking, and unstable slabs. These empty spaces often form when soil washes away due to water runoff, erosion, or poor drainage. Even when concrete looks intact on the surface, voids underneath can leave slabs unsupported and vulnerable to sudden settlement.
Poly Lift USA offers a fast, affordable way to fill voids beneath concrete before bigger problems develop. Using expanding polyurethane foam, we fill empty spaces, restore lost support, and help stabilize slabs—without digging, demolition, or replacement. Most projects are completed in hours instead of days with minimal disruption, helping homeowners save 50–75% compared to full concrete replacement.
In many cases, void filling is the missing step that helps concrete lifting last longer—or prevents the need for lifting altogether.
What Is Void Filling?
Void filling is the process of filling empty spaces beneath concrete slabs to restore proper support.
Instead of excavating soil or removing concrete, we inject high-density polyurethane foam beneath the slab. As the foam expands, it fills voids caused by erosion or washout and hardens into a strong, supportive base. This approach addresses the underlying issue beneath the concrete rather than just repairing surface damage.
Void filling is often performed before or alongside concrete leveling, slab lifting, or polyjacking to ensure long-term stability and prevent repeat settlement.
Common Signs You Need Void Filling
You may need void filling if you notice:
- Concrete that sounds hollow when tapped
- Sudden or uneven settlement with no visible cracking
- Gaps forming beneath slabs, steps, or sidewalks
- Soil washing out along slab edges
- Water pooling near concrete after rain
- Slabs that feel unstable or unsupported
- Concrete that has settled repeatedly in the same area
These signs often point to missing support beneath the slab.
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Why Voids Form Under Concrete
Voids beneath concrete typically form due to:
- Water washout and erosion from rain, poor drainage, or leaking pipes
- Downspouts or runoff directing water toward slabs
- Soil shrinkage from drying cycles
- Poorly compacted soil beneath the slab
- Utility trenches or storm drains allowing soil to move
- Organic material decay beneath concrete
Once a void forms, the slab above is no longer fully supported.
Problems Void Filling Helps Prevent
Filling voids helps prevent:
- Sudden slab settlement or collapse
- Cracking caused by unsupported concrete
- Trip hazards and uneven surfaces
- Ongoing erosion beneath slabs
- Drainage problems around concrete
- Structural stress on slabs and nearby foundations
- Costly concrete replacement
Addressing voids early can prevent much larger repairs later.
Why Homeowners and Property Managers Choose Void Filling
Void filling is a smart, preventative solution because it:
- Restores support beneath concrete slabs
- Helps prevent future settlement
- Requires no excavation or demolition
- Is fast and minimally disruptive
- Works alongside concrete leveling and slab lifting
- Costs less than full concrete replacement
It’s a proactive fix that stops problems before they get worse.
Where Void Filling Is Commonly Needed
Void filling is commonly used under:
- Driveways and approach slabs
- Sidewalks and walkways
- Patios, porches, and pool decks
- Garage floors and interior slabs
- Parking lots and drive lanes
- Warehouse and industrial floors
- Steps, stoops, and entry slabs
- Areas affected by erosion or washout
It’s especially effective in locations with water runoff or drainage issues.
Our Fix: Fast, Clean Void Filling with Poly Foam
Poly Lift USA fills voids beneath concrete using expanding polyurethane foam, a clean and effective alternative to excavation and soil replacement. This approach fills empty spaces, restores lost support, and helps stabilize concrete slabs—addressing the real cause of the problem.
Homeowners and property managers can restore support beneath concrete without tearing out slabs, digging up their property, or disrupting daily use.
Poly Lift USA is recognized across Florida, Georgia, Texas, Tennessee, and Alabama for dependable concrete leveling, void filling, and stabilization solutions. Our experience with soil erosion, washout, and unstable subgrade conditions allows a wide range of void-related issues to be addressed efficiently and effectively.
How Void Filling Works
The process is straightforward and efficient:
- Small 5/8-inch holes are drilled into targeted areas of the concrete
- Injection ports are placed into each opening
- High-density polyurethane foam is injected beneath the slab, where it expands to fill voids and restore support
- The foam hardens quickly, creating a strong, stable base beneath the concrete
- The ports are removed and the holes are cleaned and patched
In most cases, the area is ready for normal use the same day, with no excavation, no mess, and minimal disruption.
Why Poly Lift USA & The Benefits of FoamJection
Void Filling FAQs
Concrete driveways rest on subgrade, which is a fancy term for the earth below. When the subgrade begins to weaken and settle, the driveway loses its support. This can be caused by a variety of factors…weather, rain, leaks, excess weight to name a few. While the root causes may vary, the end result is always the same. Structural damage.
Over time, often in months, driveway slabs begin to stress, then crack and, eventually, break apart and sink. This leads to trip hazards, unsightly appearance and a reduction in property values. This damage is structural – not cosmetic. Neither patching nor a new surface will solve the problem.
At Poly Lift USA we offer customers an environmentally safe, affordable, long-term resolution.
Our Foamjection technology has enabled thousands of property owners in Florida, Georgia, Texas and Alabama to repair their damaged driveway and save thousands in replacement costs. Our typical repair is well under 50% less than cost of replacement.
Here’s how Foamjection technology works:
- Penny size holes are drilled through the damaged slab at 5-foot intervals.
- Specially formulated polyurethane foam is pumped through the slab reaching the subgrade underneath.
- The liquid foam fills voids and expands rapidly to compact the earth beneath the slab.
- As the foam hardens it locks the slab in place. We call this stabilization.
- When lift is required, additional foam is pumped using carefully calibrated pressure gauges until the slab is raised to the desired height.
- Drill holes are filled with sanded concrete.
All Poly Lift USA repairs come with a 10-year, transferable warranty.
If you live in Florida, Georgia or Texas and your driveway or parking area is starting to crack, settle or sink, please call Poly Lift today! (844-765-9872). See why 10,000 clients have repaired, instead of replaced their damaged driveway with Poly Lift USA.
We understand how important it is to secure your property investment and protect your family.
Please don’t wait for your driveway to become so damaged that repair is not possible. If cracked pieces become too fragmented (less than 3 feet square) repair will no longer be an option. (844-765-9872)
How It Works
Before & Afters
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WHERE WE SERVE Providing Expert Concrete Leveling Services Across Florida and Beyond
Expert Concrete Lifting in Florida
We proudly provide professional concrete leveling & repair services throughout Florida. Whether you’ve got a sinking driveway or void under your concrete, our team is here to help with all your concrete needs.
Concrete Raising in Georgia
From residential to commercial concrete lifting, our expert services are available across Georgia. We’re dedicated to restoring and leveling your concrete surfaces with precision and care.
Trusted Concrete Leveling in Texas
We bring top-notch concrete leveling services to communities all over Texas. Our experienced team is ready to tackle projects of any size to keep your concrete safe and stable.
Trusted Concrete Leveling in Tennessee
We now serve Tennessee with fast, reliable concrete leveling. Whether it’s a sunken driveway, uneven sidewalk, or settling patio, our team lifts it right the first time.
Trusted Concrete Leveling in Alabama
We now serve Alabama with fast, reliable concrete leveling. From driveways and sidewalks to patios and pool decks, our team lifts it right the first time.
