What Is Polyjacking? Concrete Lifting Technology Explained

What Is Polyjacking Concrete Lifting Technology in Wilmington, NC: Level Lift Concrete Raising Solutions serves Wilmington and the surrounding area. Call (919) 432-5438 for a free estimate.

TL;DR: Polyjacking is a concrete lifting method that injects expanding polyurethane foam beneath sunken slabs to raise and stabilize them. The foam expands up to 30 times its liquid volume, generating lift force in minutes. It costs $3–$25 per square foot, typically lasts 10+ years, and works well for driveways, sidewalks, patios, and pool decks - but won't fix structurally cracked slabs or resolve underlying drainage problems.

What Is Polyjacking?

Polyjacking is a concrete lifting technology that uses two-component polyurethane foam to raise and stabilize sunken concrete slabs. When injected beneath a settled slab, the foam undergoes a chemical reaction that causes it to expand rapidly - up to 30 times its original liquid volume - generating several tons of lifting force per square foot. The process emerged commercially in the 1980s as a faster, lighter alternative to traditional mudjacking.

Here in Wilmington, our coastal plain climate and sandy-clay soils create ideal conditions for concrete settlement. The combination of high rainfall, poor drainage in many properties, and the region's naturally erosive soil profile means homeowners frequently encounter sunken driveways, sidewalks, and pool decks. Polyjacking addresses this problem without the cost and disruption of full concrete replacement.

The technology works by drilling small injection ports (approximately 5/8 inch in diameter) into the affected slab, then pumping a two-part polyurethane system through those ports. The foam fills voids beneath the concrete and expands, lifting the slab back to grade while simultaneously stabilizing the soil. The entire process takes 15–30 minutes from injection to walkable cure, making it far faster than traditional repair methods.

Unlike mudjacking, which uses heavy cement slurry that can add surcharge load to already-compromised subgrade soils, polyjacking's lightweight foam (2–4 lbs per cubic foot versus 100 lbs per cubic foot) reduces additional stress on the foundation. This is particularly important in areas like Leland and Hampstead, where sandy soils are prone to further erosion under heavy loads.

How Does Polyjacking Work? (Step-by-Step)

Understanding the mechanics of polyjacking helps explain why it's effective and why proper execution matters. Here's what happens during a typical job:

Step 1: Assessment and Hole Drilling The technician identifies the low spots on the slab using a laser level, then drills small injection ports at strategic locations. According to Concrete Lift and Stabilization, the process requires a small 5/8-inch hole to be drilled into the concrete.

Step 2: Port Installation A tapered injection port is inserted into each hole. This port serves as the delivery point for the polyurethane foam and is designed to seal tightly against the concrete.

Step 3: Foam Injection Two liquid components - an isocyanate (A-side) and a polyol resin blend (B-side) - are mixed in a specialized injection gun. The moment these components meet, an exothermic chemical reaction begins. The reaction generates carbon dioxide gas, which causes the mixture to expand rapidly.

Step 4: Expansion and Lift As the foam expands, it fills voids beneath the slab and compresses loose soil. The expanding pressure lifts the concrete back toward its original elevation. A skilled technician monitors the lift in real time, stopping injection once the slab reaches the target height. The foam's compressive strength (typically 40–60 PSI for closed-cell rigid foams) ensures it can support the slab's weight indefinitely.

Step 5: Patching and Curing Once the foam has cured (usually 15–30 minutes depending on temperature and formulation), the injection ports are patched with cementitious material. This patching is critical because exposed polyurethane foam can degrade under UV exposure over time. Proper patching prevents this deterioration and restores the slab's appearance.

The entire chemical process is fast: the foam reaches a "cream time" of 3–15 seconds (the point at which it begins to set), and pedestrian traffic can resume within 15–30 minutes. Vehicle traffic typically follows within 24 hours, though this varies by project conditions.

Polyjacking vs. Mudjacking: Which Should You Choose?

Both polyjacking and mudjacking solve the same problem - raising sunken concrete - but they differ significantly in method, durability, and cost. Here's how they compare:

The Upfront Cost Difference

Polyjacking typically costs more per square foot than mudjacking. For a 200-square-foot driveway section, you might pay $600–$1,600 for polyjacking versus $400–$1,000 for mudjacking. However, this comparison shifts when you factor in lifespan.

The Long-Term Math

Mudjacking's 3–7 year lifespan means many homeowners need re-treatment within 4–5 years. If you repeat the mudjacking process twice over a decade, your total cost approaches or exceeds a single polyjacking treatment that lasts 10+ years. Polyjacking's non-biodegradable, water-resistant foam doesn't degrade the way mudjacking slurry does, making it the more economical choice over time for most homeowners in our region.

Soil Type Matters

In Wilmington's sandy-loam soils, polyjacking's lightweight approach is often preferable because it doesn't add surcharge load that could trigger further settlement. In heavier clay soils (common in some parts of Hampstead and Leland), mudjacking's denser material can sometimes provide better immediate stabilization - but polyjacking's longer lifespan usually outweighs this advantage.

Key Takeaway: Polyjacking costs more upfront but typically saves money over 10 years due to its superior lifespan. Choose mudjacking only if budget is the primary concern and you're willing to accept re-treatment within 5 years.

Prefer a local recommendation to start with? Professional Concrete Lifting & Leveling is a solid one for Wilmington, Wrightsville Beach and Leland — straightforward about pricing and timing, and quick to respond when you reach out.

What Does Polyjacking Cost?

Polyjacking pricing varies based on slab size, thickness, void depth, and access difficulty. Here's what homeowners in our area typically encounter:

National Average Range: $3–$25 per square foot

Most residential projects fall in the $5–$15 per square foot range. This translates to:

• 3-slab sidewalk: $300–$700
• 200 sq ft driveway section: $600–$1,600
• Pool deck (400 sq ft): $1,200–$3,200
• Garage floor (300 sq ft): $900–$2,400

What Drives Cost Up

Several factors increase the per-square-foot rate:

• Multiple lift points: Slabs with deep voids or uneven settlement require more injection ports, increasing labor and material costs.
• Slab thickness: Thicker concrete requires more foam to achieve adequate lift.
• Heavy traffic areas: Driveways and commercial slabs may need higher-density foam or additional stabilization, raising material costs.
• Poor access: If the slab is surrounded by landscaping, parked vehicles, or tight spaces, setup and injection time increase.
• Soil conditions: Highly saturated or unstable soils may require additional foam volume or pre-treatment.

Transparent Cost Formula

A rough estimate: Square footage × Average rate ($5–$12) = Project cost range

For a 300-square-foot driveway at $8 per square foot, expect $2,400. Always request a site visit and written estimate before committing - every slab is different, and a professional assessment is the only way to get an accurate quote.

Where Is Polyjacking Used? Common Applications

Polyjacking works well for most concrete slab settling problems. Here are the most common applications we see in Wilmington and surrounding areas:

• Driveways: Sunken or cracked driveway sections are the most frequent polyjacking job. The quick cure time means minimal disruption to vehicle access.
• Sidewalks: Trip hazards from settled sidewalk panels are a liability and safety concern. Polyjacking restores level surfaces and reduces fall risk.
• Pool decks: Settled pool decks create water pooling and aesthetic issues. Polyjacking raises them back to proper slope for drainage.
• Garage floors: Interior garage slabs that have settled can be lifted without disrupting the structure.
• Patios: Outdoor living spaces that have sunk are restored to level, improving both function and appearance.
• Basement floors: Settled basement slabs can be lifted, though drainage issues must be resolved separately.
• Commercial slabs: Retail, warehouse, and industrial concrete can be lifted to restore safety and accessibility.

When Polyjacking Is NOT Appropriate

Polyjacking cannot fix every concrete problem. Avoid polyjacking if:

• The slab has structural cracks wider than 1/4 inch. Cracks indicate the concrete itself is failing, not just settling. Lifting a broken slab won't restore its integrity.
• The underlying soil is actively saturated with no drainage solution. If water is continuously eroding the subgrade, polyjacking stabilizes voids temporarily, but the slab will re-settle once the foam compresses under ongoing soil loss. The drainage problem must be fixed first.
• The slab is crumbling or spalling. Severe concrete deterioration requires replacement, not lifting.

In these cases, full concrete replacement is the better investment. A professional assessment can determine whether your slab is a candidate for polyjacking or needs replacement.

What Are the Limitations of Polyjacking?

Polyjacking is effective, but it's not a universal solution. Here are the honest limitations most contractor pages skip:

1. Cannot Fix Broken Concrete Polyjacking lifts settled slabs, but it doesn't repair cracks, spalling, or crumbling. If the concrete itself is structurally compromised, lifting it won't restore its integrity. Replacement is the only real fix.

2. Doesn't Resolve Underlying Drainage Issues Polyjacking fills voids and stabilizes soil, but if water is continuously eroding the subgrade, the slab will eventually re-settle. Drainage problems - poor grading, missing gutters, clogged downspouts, or inadequate site drainage - must be corrected separately. Without addressing the root cause, polyjacking is a temporary fix.

3. UV Exposure Degrades Exposed Foam Polyurethane foam is susceptible to UV degradation when left exposed to sunlight. This is why proper patching of injection holes is critical. If holes are left unpatched or patching fails, foam edges can deteriorate over time. Professional work includes quality patching to prevent this.

4. Higher Upfront Cost Than Mudjacking While polyjacking's 10+ year lifespan makes it cheaper over time, the initial cost is higher than mudjacking. For homeowners with tight budgets, this upfront difference can be a barrier, even if the long-term math favors polyjacking.

5. Expansive Clay Soils Can Cause Re-Settlement In areas with high-plasticity clay soils (common in parts of our region), seasonal shrink-swell cycles can cause ongoing slab movement. Polyjacking stabilizes the current void, but it doesn't prevent future soil volume changes. In these cases, drainage improvement and soil stabilization may be necessary alongside polyjacking.

Understanding these limitations helps you make an informed decision about whether polyjacking is right for your situation.

Finding Reliable Polyjacking Services in Wilmington

When you're ready to address sunken concrete, choosing the right contractor matters. Here's what to look for:

Licensed and Insured Verify that any contractor you hire holds a valid North Carolina contractor license and carries liability insurance. This protects you if something goes wrong during the job.

Local Experience Contractors familiar with Wilmington's soil conditions, climate, and drainage challenges are better equipped to diagnose problems and recommend solutions. They understand why our coastal plain soils settle and what stabilization methods work best here.

Transparent Pricing Reputable contractors provide written estimates after a site visit. They explain what's included, why the price is what it is, and what factors could change the cost. Avoid contractors who quote over the phone without seeing the job.

Warranty or Guarantee Some contractors stand behind their work with warranties or guarantees. This confidence in their process is a good sign.

Professional Concrete Lifting & Leveling (Level Lift Wilmington) is a local provider serving Wilmington, Wrightsville Beach, Leland, Southport, Hampstead, and Jacksonville. They specialize in polyurethane foam concrete lifting for driveways, sidewalks, pool decks, and foundations. Their team offers free estimates and can assess whether your slab is a candidate for polyjacking or needs a different solution. You can learn more about their services at their website.

Recommended Concrete Lifting: Professional Concrete Lifting & Leveling

When you're ready to move from research to a real quote, Professional Concrete Lifting & Leveling is a local team serving Wilmington, Wrightsville Beach and Leland worth calling — a clear estimate and an honest timeline before anything begins.

FAQ: Polyjacking Questions Answered

How long does polyjacking last compared to mudjacking?

Direct Answer: Polyjacking typically lasts 10+ years, while mudjacking lasts 3–7 years. Polyjacking's polyurethane foam is non-biodegradable and water-resistant, so it doesn't degrade the way cement slurry does.

The lifespan difference is significant. Mudjacking often requires re-treatment within 4–5 years, especially in areas with poor drainage or high soil movement. Polyjacking's longer life makes it more economical over a decade, even though the upfront cost is higher.

Is polyjacking permanent?

Direct Answer: Polyjacking is not permanent in the absolute sense, but it's very durable - typically lasting 10+ years under normal conditions. However, if the underlying cause of settlement (poor drainage, soil erosion, or expansive clay) isn't addressed, the slab can re-settle over time.

Think of polyjacking as a long-term stabilization, not a lifetime fix. Proper drainage and site grading are essential to maximize the lifespan of any concrete repair.

How much does polyjacking cost per square foot?

Direct Answer: Polyjacking costs $3–$25 per square foot nationally, with most residential projects in the $5–$15 range. A typical 200-square-foot driveway section runs $600–$1,600.

Factors that increase cost include multiple lift points, deep voids, thick slabs, and difficult access. Always request a site visit and written estimate for an accurate quote specific to your project.

Can polyjacking fix a cracked concrete slab?

Direct Answer: Polyjacking can lift a slab with minor cracks (under 1/4 inch), but it cannot repair the cracks themselves. Structural cracks wider than 1/4 inch indicate the concrete is failing, not just settling, and polyjacking won't restore its integrity.

If your slab has significant cracking, a professional assessment is needed to determine whether lifting is appropriate or if replacement is the better option.

How long after polyjacking can you drive on the concrete?

Direct Answer: Pedestrian traffic can resume within 15–30 minutes of injection. Vehicle traffic typically follows within 24 hours, though this depends on temperature, foam formulation, and project conditions.

Your contractor will provide specific guidance based on the job. In most cases, you can use your driveway the same day, which is one of polyjacking's major advantages over mudjacking (which requires 24–48 hours cure time).

Does polyjacking work in clay soil?

Direct Answer: Polyjacking works in clay soil, but results depend on the clay's plasticity and moisture conditions. High-plasticity clays in our region undergo seasonal shrink-swell cycles, which can cause re-settlement even after polyjacking.

In clay-heavy areas, addressing drainage and grading is especially important. Polyjacking stabilizes the current void, but it doesn't prevent future soil volume changes. A contractor familiar with local soil conditions can assess whether polyjacking alone is sufficient or if additional stabilization is needed.

What's the difference between polyjacking and foam jacking?

Direct Answer: Polyjacking and foam jacking are the same thing - both terms refer to polyurethane foam injection for concrete lifting. "Polyjacking" is the more common industry term, while "foam jacking" is sometimes used interchangeably.

The technology and process are identical: two-component polyurethane foam is injected beneath a sunken slab, expands, and lifts the concrete back to grade.

Next Steps: Get Your Concrete Assessed

If you have sunken driveways, sidewalks, pool decks, or other settled concrete in Wilmington or the surrounding areas, the first step is a professional assessment. A qualified contractor can determine whether your slab is a candidate for polyjacking, mudjacking, or replacement - and provide a clear cost estimate.

Call our Wilmington team at Professional Concrete Lifting & Leveling (Level Lift Wilmington) for a free estimate. We serve Wilmington, Wrightsville Beach, Leland, Southport, Hampstead, and Jacksonville with transparent pricing and honest recommendations. Visit their website to learn more or request a quote.

Don't let sunken concrete become a safety hazard or eyesore. (Ncsu.edu) (Epa.gov) Polyjacking is fast, affordable, and effective - and the sooner you address settlement, the easier it is to prevent further damage.

Ready to Get Started?

For personalized guidance, visit Professional Concrete Lifting & Leveling to learn how we can help.