Solution
Polyjacking: Fast, Lightweight Slab Lifting with Polyurethane Foam
Small holes, quick cure, long-lasting lift — the modern alternative to traditional mud jacking.
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Polyurethane foam injection — called polyjacking or slab jacking — lifts settled concrete by injecting high-density expanding foam through 5/8-inch holes drilled in the slab. The foam expands to fill voids beneath the concrete and generates enough upward pressure to lift the slab back to grade, then cures rigid within minutes. It's the fastest and least invasive method for lifting sunken driveways, garage floors, pool decks, sidewalks, and interior slabs across Middle Tennessee. Because the foam is lightweight and water-resistant, it doesn't add load to the soil and won't wash out or compress over time the way soil-based fill can.
How It Works
Two-component polyurethane foam (an isocyanate and a polyol resin) is heated to the proper viscosity and injected through small holes in the slab using a proportioning pump and heated hose. When the two components contact each other at the injection tip beneath the slab, they react and expand rapidly — typically 20 to 30 times their liquid volume — filling voids and applying upward pressure. The technician controls injection volume and monitors slab movement at multiple points to achieve uniform lift without over-raising any section. Once the target elevation is reached, injection stops and the foam cures rigid within 15 to 30 minutes. The small injection holes are plugged with cement mortar and finished flush. The total process from drilling to cleanup is usually completed in a few hours.
Problems This Solves
"Polyjacking is the right answer for most residential slab lifting. The ports are tiny, the foam is in there and hard in under an hour, and you're not waiting a day to use your driveway. For driveways, sidewalks, and pool decks, it checks every box."
How It Works
What to expect from start to finish.
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Slab Assessment and Port Layout
We probe for voids, measure settlement with a level, and identify the slab's pivot points. Port locations are laid out to provide complete foam coverage beneath the sunken area — typically in a grid pattern with 2- to 4-foot spacing.
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5/8-Inch Port Drilling
Small 5/8-inch holes are drilled through the slab at the marked port locations using a rotary hammer. These holes are significantly smaller than mud jacking ports and leave a less visible patch afterward.
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Injection Tip Installation
A short injection tip (a small plastic or metal port) is inserted into each drilled hole to guide the foam beneath the slab and prevent blowback at the surface during injection.
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Controlled Foam Injection and Lift Monitoring
Starting at the lowest or most settled area, foam is injected port by port. The technician watches for slab movement at adjacent reference points and injects in short bursts, allowing the foam to expand and stabilize before adding more. This iterative approach prevents over-lifting.
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Foam Cure — 15 to 30 Minutes
Unlike mud jacking, which requires 24 hours before vehicle traffic, polyjacking foam cures rigid in 15 to 30 minutes. Once injection is complete at all ports, the foam is already setting while we move on to patching.
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Port Patching and Site Cleanup
Each 5/8-inch port is plugged with cement mortar and finished flush with the slab surface. Foam overspray at the slab edges is trimmed. The area is cleaned and returned to service — vehicle traffic permitted within the hour in most cases.
FAQ
Frequently Asked Questions
How is polyjacking different from mud jacking?
Polyjacking uses expanding polyurethane foam; mud jacking uses a cement-soil slurry. Foam cures in minutes versus 24 hours for slurry. Foam ports are 5/8 inch versus 1.5 to 2 inches for mud jacking, leaving smaller patches. Foam is also lighter — it adds almost no load to the soil beneath the slab. For most residential driveways and sidewalks, polyjacking is faster and cleaner. For very large voids or heavy commercial slabs, mud jacking or grouting may be more appropriate.
How quickly can I use my driveway after polyjacking?
Typically within 30 to 60 minutes of completion. The foam cures rigid fast, and there's no slurry-cure wait period. We'll confirm the exact return-to-service time based on the foam used and conditions on your project day.
Will the foam wash out or break down underground?
No. High-density polyurethane foam is moisture-resistant and does not biodegrade in the ground. It won't wash out in heavy rain events, compress under slab load, or shrink over time. This is one of the reasons polyjacking results tend to last longer than traditional mud jacking in areas with heavy seasonal rainfall.
Can polyjacking lift a pool deck that's settled?
Yes. Pool decks are a common polyjacking application. The lightweight foam is especially well-suited because it doesn't add soil load near the pool shell, and the small ports leave minimal damage to decorative concrete surfaces. We take care around pool equipment and bonding wires during the process.
What if my slab settles again after polyjacking?
Polyjacking addresses the void and restores the slab to grade — but it doesn't fix the condition that caused the void in the first place. Poor drainage, plumbing leaks, and soil erosion need to be corrected to prevent recurrence. We identify contributing factors during the inspection and recommend corrections alongside the lifting work.