Polyjacking: Leveling Uneven Concrete With Lightweight Foam
A clean, fast way to raise settled slabs across North and South Carolina, restoring a level surface without tearing out and repouring the concrete.
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What to Know About Polyjacking
A settled slab has empty space underneath it, and polyjacking fills that space with an expanding foam that carries the load, supporting the slab and pushing it back up. Our crew drills small holes through the concrete, smaller than the holes mud jacking uses for its cement slurry, and sets injection ports in them. A polyurethane mixed from two parts is pumped through the ports and reacts beneath the slab into a rigid foam.
The foam raises the concrete in small increments while the crew monitors elevation in real time, so the slab reaches its target height without lifting too far or cracking. That also removes the raised lip at a joint. Polyjacking does not change the soil or drainage that let the slab settle, so diagnosis comes first.
Foam suits many Carolina slabs for practical reasons:
- It is lightweight, so it does not add significant load to loose or washed out soil
- It cures fast, which limits downtime on a walkway or patio
- The cured foam is made to hold up in damp conditions
The symptoms that usually lead to polyjacking are on the concrete leveling problem signs page, alongside the other signs that point to the same underlying cause.
How We Lift Concrete With Polyjacking
- Step 01
Inspection and Diagnosis
We start by evaluating the slab and why it settled. We check the degree and direction of settlement, look for voids beneath the concrete, and assess the soil and drainage conditions around the slab. In Piedmont clay, Sandhills sand, or saturated coastal soils, the cause of the settlement shapes the recommendation, and we will tell you plainly if polyjacking is not the right fit for your slab.
- Step 02
Confirm Candidacy and Explain the Plan
Polyjacking suits many flatwork slabs, from sidewalks and walkways to garage floors, but it is not appropriate for every situation. We confirm whether your slab is a good candidate, walk you through what the lift will involve, and explain any conditions around the slab that the plan has to account for. You get a clear picture, and a quote, before any work begins.
- Step 03
Drill Small Injection Holes
Our crew drills a pattern of small holes through the surface of the slab in the areas that need lifting. The hole pattern is planned around where the voids are and how the slab needs to rise, so the concrete comes up evenly.
- Step 04
Inject the Foam and Lift the Slab
A polyurethane mixed from two parts is pumped through the injection ports. The two parts react beneath the slab and expand into a rigid foam that fills the voids and raises the concrete in small, monitored increments back toward its original height. The crew watches elevation in real time so the lift stays even and the slab does not rise too far or crack.
- Step 05
Patch, Clean up, and Review
Because the foam cures quickly, the slab is usually ready to bear weight again soon after the lift. We patch the small injection holes, clean the work area, and review the finished result with you. Where joints are open, joint sealing after the lift helps limit water working beneath the slab.
How Does Polyurethane Foam Lift a Sunken Slab?
Our crew drills small holes through the slab and injects a polyurethane mixed from two parts. The foam expands beneath the concrete, fills the empty space and raises the slab in small, controlled increments, and the existing slab stays in place.
Care and Expertise From a Team Serving the Carolinas Since 2017
When the fix is polyjacking, our own crews do the work. HydroHelp911 handles concrete leveling and related structural and moisture work across North and South Carolina.
An inspector looks at your home, finds the source of the problem, and explains each finding in plain language. There is no obligation.
We are headquartered in Dallas, North Carolina, with eight offices across North and South Carolina.
Foundation repair, crawl space repair and encapsulation, basement waterproofing, framing repair, and concrete leveling are the whole focus of the team.
We have 1,300+ verified Google reviews (4.9 stars) from homeowners across the Carolinas and are BBB A+ Accredited.
For example, helical and push piers carry a lifetime warranty that no additional settlement will occur in the area of installed piers, once the final invoice is paid in full. Read the warranty terms.
Ask your inspector about financing when you get your written estimate. See financing options.
Common Questions About Polyjacking
Don't see your question here? Call or fill out our quick online form, and our team will help.
Both methods level a settled slab by filling the voids underneath it, but they use different materials. Mud jacking pumps a heavy slurry made with cement through larger holes. Polyjacking injects a lightweight expanding polyurethane foam through smaller holes, cures faster, and adds far less weight to the soil. Neither method is automatically better for every slab. HydroHelp911 lifts slabs with polyurethane foam injection, and this comparison explains how mud jacking differs. During your inspection we explain how the foam lift fits your slab and the soil beneath it.
Which Concrete Leveling Problem Signs Can Polyjacking Help With?
A sign can trace to more than one cause. These are the concrete leveling signs that can point to a cause this method addresses; the inspection shows which cause is at work in your home.
Uneven Concrete Slabs
When a driveway, patio, walkway, or garage floor sits uneven, the soil under it has usually moved.
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Cracked Concrete
Cracks in a driveway, garage floor, patio, or interior slab can be harmless curing cracks, or they can be the concrete responding to drainage and soil movement below it.
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Broken Sidewalk
When a sidewalk cracks, drops, or lifts into a raised edge, the soil under it has usually moved, or a root has pushed up against it.
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Tripping Hazards
A raised or sunken slab edge along a walkway, driveway, or patio usually starts when the soil under the slab moves and the concrete follows it.
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Cracked Garage Floor
A garage floor is a concrete slab poured directly on soil, so it relies on the ground beneath it to stay flat and supported.
Learn MoreOther Concrete Leveling Solutions We Install
Each solution fits a different cause. The inspection shows which one your home needs.
Concrete Joint & Crack Sealing
A focused way to seal control joints and surface cracks in walkways, garage floors, and patios, paired with a look at what opened them.
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Concrete Patching
A targeted repair for cracked, chipped, and spalled concrete, used to close out surface damage and remove tripping hazards once a slab is supported and sitting where it should.
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Concrete Void Filling
Filling the empty space under your concrete to restore stability, remove trip hazards, and improve the look of uneven slabs.
Learn MorePolyurethane Foam Injection
A clean, fast, lightweight way to raise and level settled slabs, without tearing out and repouring the concrete.
Learn More
Get the Free Concrete Leveling Guide
A free guide for homes in North and South Carolina: why walkways, patios, steps and garage floors sink, what to look for, and what polyurethane foam lifting is, in plain language.
- A checklist to take on a walk around your walkways, patio, steps, pool deck and garage floor
- Why concrete settles in Piedmont clay, on slopes and in coastal sand
- What polyurethane foam lifting is, and how it compares with mudjacking and replacement
- Questions worth asking any contractor, including us
1,300+ Verified Google Reviews (4.9 Stars)
Before you choose a contractor for polyjacking, read how homeowners across North Carolina and South Carolina rate our work.
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