You step onto your San Antonio driveway and feel that familiar tilt — one slab corner has dropped nearly an inch, water now pools against the foundation, and hairline cracks are spreading toward the garage. Two phrases keep surfacing in contractor quotes: mudjacking vs polyjacking.
Homeowners researching slab lifting in expansive-clay regions of South Texas often discover these methods produce dramatically different price tags, cure times, and longevity windows. Local concrete leveling specialists typically inject either a cement-based slurry or a high-density polyurethane foam beneath the sunken slab to raise it back to grade.
The right choice depends on soil conditions, slab thickness, load requirements, and how soon the surface needs to handle traffic. Get matched with vetted contractors through our to compare both approaches side-by-side before committing to a repair plan.
Quick Takeaways
- Mudjacking uses a cement slurry pumped through 1.5-inch holes and typically costs $3 to $7 per square foot in San Antonio, with a working life of 5 to 10 years.
- Polyjacking injects expanding polyurethane foam through dime-sized ports and runs $7 to $17 per square foot, lasting 20 years or more in stable soil.
- Slabs lifted with foam are ready for use within 15 minutes, while mudjacked surfaces generally require 24 to 72 hours of cure time before vehicles or heavy loads return.
- San Antonio's expansive clay soils shift seasonally, which often favors lightweight foam over heavier cement slurry on driveways, patios, and pool decks prone to repeated movement.
- Homeowners should request written soil assessments and verify warranty terms before hiring; matched contractors through this provide comparable scoped bids for informed decisions.
How Mudjacking and Polyjacking Lift Concrete Slabs Differently
Mudjacking and polyjacking both raise sunken concrete, but the lifting mechanism behind each method is fundamentally different. Mudjacking, sometimes called slabjacking, relies on a dense cement slurry pumped through 1.5- to 2-inch holes drilled into the affected concrete slab.
The thick mixture of cement, soil, sand, and water flows into voids beneath the slab, then physically pushes the concrete upward as more material is forced in.
Polyjacking takes a chemistry-driven approach instead. Contractors drill smaller holes — typically 5/8 inch — and inject two-part polyurethane foam that begins expanding within seconds. The foam reacts, hardens, and lifts the slab as it grows, reaching roughly 90 percent of its final strength in about 15 minutes.
Lifting Mechanism Side by Side
- Mudjacking: Hydraulic pressure from the pumped slurry does the lifting. The weight of the slurry itself (around 100 pounds per cubic foot) provides long-term support beneath the slab.
- Polyjacking: Chemical expansion does the lifting. The cured foam weighs only 2 to 4 pounds per cubic foot, putting far less load on the underlying soil.
- Drill footprint: Mudjacking holes are about three times larger and more visible after patching, while polyjacking holes are roughly the size of a penny.
- Cure window: Slurry needs 24 to 72 hours to fully set before heavy loads return; foam is drive-ready within minutes.
Local San Antonio homeowners often see both options offered for driveways, patios, pool decks, and garage floors. The right fit depends on slab thickness, void size, soil moisture, and how quickly the surface needs to return to service.
Homeowners can get matched with vetted slab repair contractors through our, and those professionals will assess which lifting mechanism suits the specific San Antonio property conditions before quoting the work.
Cost Comparison: Mudjacking vs Polyjacking in San Antonio
Mudjacking costs in the San Antonio market typically run $3 to $7 per square foot, while polyjacking costs range from $7 to $17 per square foot. The price gap reflects material expense — polyurethane foam is significantly more expensive than the cement slurry pumped through holes in traditional mudjacking work.
For a standard two-car driveway in San Antonio of about 600 square feet, homeowners should expect mudjacking quotes between $1,800 and $4,200. The same driveway repaired with polyjacking foam typically lands between $4,200 and $10,200.
A smaller patio of 200 square feet runs roughly $600 to $1,400 for mudjacking versus $1,400 to $3,400 for polyjacking.
Why San Antonio Pricing Varies
Several Texas-specific factors push the final cost per square foot up or down on any given slab. Local labor rates in San Antonio sit slightly below the national average, which generally favors mudjacking quotes.
However, the region's expansive clay soils sometimes require deeper injection points or additional lifting passes, which can add to total project costs regardless of method.
- Slab accessibility — backyard patios behind narrow gates often carry a 15 to 25 percent premium
- Lift severity — slabs settled more than two inches need more material
- Soil moisture conditions — wet seasons in central Texas can complicate injection work
- Minimum service fees — most San Antonio contractors set $500 to $800 minimums
Long-term value also factors into the comparison. Polyjacking carries a higher upfront price but typically lasts longer in shifting Texas soils. Mudjacking offers lower entry cost and works well for larger, less critical surfaces.
Get matched with vetted contractors through our to receive accurate quotes from local professionals familiar with San Antonio soil conditions and current material pricing.
Durability, Longevity, and Performance on San Antonio Soil
Longevity is where the two methods diverge most sharply on Bexar County's expansive clay soil. Mudjacking installations typically hold for 5 to 10 years before settling resumes, while polyjacking solutions often last 20 years or longer on comparable lots in San Antonio.
The difference comes down to material behavior under stress. Cement slurry is heavy, often adding 50 to 100 pounds per cubic foot of fill, which can accelerate re-settling on the same weak soils that caused the original problem.
Polyurethane foam weighs roughly 2 pounds per cubic foot, placing minimal additional load-bearing stress on already-stressed substrates.
How Each Method Handles Moisture and Soil Movement
San Antonio's clay soil swells when saturated and shrinks during summer drought, with seasonal vertical movement of up to 4 inches in some neighborhoods. This cyclical behavior punishes any repair material that cannot flex or resist water.
- Water resistance: Polyurethane foam is closed-cell and hydrophobic, meaning it does not absorb moisture or break down when groundwater rises after heavy rain.
- Cement slurry: The mudjacking mixture is porous and can erode over time as water moves through and around the fill material.
- Soil compatibility: The lighter foam reduces the chance of triggering further compression in soft clay layers below the slab.
- Load distribution: Foam expands to fill voids more completely, spreading weight evenly across the supporting soil column.
Local mold remediation and foundation contractors typically note that polyjacking performs better on properties with documented soil movement history. That said, mudjacking still delivers acceptable longevity on stable subgrades and remains a viable option for budget-conscious projects.
Homeowners can get matched with vetted slab repair contractors through our to evaluate which method aligns with their specific soil conditions and timeline expectations.
Pro Tip: Match the Method to the Slab's Future Load
When homeowners weigh mudjacking vs polyjacking in San Antonio, the smartest filter is not price — it is the slab's expected load over the next decade. Polyurethane foam handles driveways, garage floors, and pool decks better because it resists moisture cycling in Bexar County clay.
Cement slurry still wins for low-traffic patios and walkways where budget matters more than longevity. Get matched with vetted contractors through our for both methods on your specific slab.
When Mudjacking Wins vs When Polyjacking Wins
Choosing between the two methods often comes down to slab type, access, and load conditions. Local contractors typically recommend mudjacking for heavy-duty applications where weight and budget matter most. Polyjacking tends to win on slabs where weight sensitivity, speed, or tight access control the project.
When Mudjacking Is the Better Choice
Mudjacking generally outperforms on a sunken driveway where vehicle loads are heavy and the underlying soil is stable. The dense cement slurry handles compaction well beneath thick residential driveways and rural concrete pads.
Professional companies also favor mudjacking for large void fill jobs under barn floors, agricultural slabs, and oversized patios where material volume drives cost savings.
Other strong-fit scenarios include:
- Pool deck sections away from the waterline where weight is not a structural concern
- Exterior sidewalk panels in older neighborhoods with established, non-expansive subsoil
- Commercial parking aprons and loading zones with heavy point loads
When Polyjacking Is the Better Choice
Polyjacking shines on slabs where weight cannot be added to already-compromised soil. A settling garage floor over loose fill or expansive clay benefits from the foam's lightweight expansion, which lifts without further loading the substrate.
The same applies to any interior slab inside finished living space, where minimal-invasion injection holes and rapid cure times matter for homeowners.
Polyjacking also wins for:
- Pool deck coping and waterline panels where moisture-sensitive cement slurry is not ideal
- Narrow sidewalk trip-hazard repairs requiring precision lift adjustments
- Tight-access courtyards and rooftop slabs where pump trucks cannot reach
Homeowners weighing options in older neighborhoods can get matched with vetted contractors through our, who will assess slab condition, soil profile, and load expectations before recommending a method.
How to Choose the Right Slab Repair Method for Your Property
Choosing between mudjacking and polyjacking starts with a thorough slab inspection. Homeowners should look for visible signs like cracks wider than a quarter inch, doors that stick, uneven driveway panels, or pooling water near the foundation.
Local contractors in San Antonio typically perform a that includes elevation readings and void mapping beneath the slab.
Questions to Ask a San Antonio Slab Repair Contractor
Before signing any agreement, professional companies should be able to answer specific questions clearly. Get matched with vetted contractors through our to compare answers across multiple bids.
- Are you in Texas, with proof of general liability coverage?
- What is your written warranty, and does it cover settlement or just workmanship?
- How many similar projects have been completed on Bexar County clay soil?
- Will the written estimate itemize material costs, labor, and cleanup separately?
- What happens if the slab settles again within the warranty window?
Reputable contractors provide a detailed written estimate after inspecting the property in person, never over the phone. The document should specify the lifting method, expected cubic footage of fill material, total square footage covered, and a clear warranty term ranging from 2 to 10 years depending on the technique.
Red flags include door-to-door sales pressure, demands for full payment upfront, refusal to show licensing credentials, vague verbal warranties, and quotes that come in dramatically below market rates.
Homeowners in San Antonio should also be cautious of contractors who recommend the same method for every situation without evaluating soil conditions or slab type. Comparing at least three written bids protects the investment.
Mudjacking vs Polyjacking: Side-by-Side Comparison for San Antonio Slab Repair
| Factor | Mudjacking | Polyjacking | Best For |
|---|---|---|---|
| Cost per Square Foot | $3 to $7 | $5 to $17 | Mudjacking wins on tight budgets; polyjacking justifies the premium on long-term jobs |
| Material Weight | 100 to 150 pounds per cubic foot (cement slurry) | 2 to 4 pounds per cubic foot (polyurethane foam) | Polyjacking for weak or saturated San Antonio clay subgrades |
| Cure and Return-to-Service Time | 24 to 48 hours before full load use | 15 to 30 minutes before driving or walking | Polyjacking for driveways, commercial lots, and time-sensitive lifts |
| Injection Hole Size | 1 to 2 inches in diameter | 3/8 to 5/8 inch in diameter | Polyjacking for stamped, decorative, or visible interior slabs |
| Expected Lifespan on Bexar County Clay | 5 to 10 years before potential re-settlement | 20 plus years with stable performance through wet-dry cycles | Polyjacking for expansive clay zones with seasonal moisture swings |
| Water and Erosion Resistance | Susceptible to washout and re-saturation | Closed-cell, hydrophobic, and chemically inert | Polyjacking near downspouts, irrigation lines, and poor-drainage lots |
Frequently Asked Questions
How long do mudjacking and polyjacking repairs take to complete in San Antonio?
Most residential concrete lifting projects finish in a single day. Polyjacking on a typical driveway or patio takes two to four hours, with the slab ready for foot traffic in about 15 minutes. Mudjacking jobs run four to six hours and require a 24- to 48-hour cure before vehicle loads.
Larger commercial slabs may stretch into a second day.
Will either method damage my existing landscaping or hardscape?
Both methods are minimally invasive compared with full slab replacement. Polyjacking uses 5/8-inch injection ports, while mudjacking requires 1.5- to 2-inch holes drilled through the slab. Neither process disturbs surrounding soil, sod, or adjacent hardscape.
Professional companies in San Antonio typically protect nearby flower beds with tarps and clean residual slurry from joints before crews leave the property.
Can sunken concrete around a pool deck or pier be lifted safely?
Yes, but the chosen method matters. Polyurethane foam is the preferred option around pools, piers, and steps because it cures quickly, resists pool chemicals, and adds negligible weight to fragile substructures. Mudjacking works on heavier deck slabs but the cement slurry weight can stress already-compromised soil.
A qualified contractor should evaluate substrate stability before recommending an approach.
How do I know if my slab is a candidate for lifting instead of replacement?
Slabs with hairline to 1/2-inch cracks, intact rebar, and settlement under three inches are usually good candidates. Replacement is recommended when concrete shows spalling, severe spider cracking, or settlement greater than four inches.
Homeowners should request a written assessment that documents void depth, crack pattern, and soil conditions before approving either lifting method.
Are mudjacking and polyjacking covered by homeowners insurance?
Coverage depends on the cause of settlement. Sudden events like plumbing leaks or burst pipes are often covered, while gradual settlement from expansive clay soil or poor drainage is typically excluded. Policyholders should review their declarations page and request a contractor report citing the failure cause.
Get matched with vetted contractors through our to obtain documentation suitable for insurance claims.
Both mudjacking and polyjacking deliver proven results for sunken slabs, but the right choice depends on your specific soil conditions, slab type, and long-term plans for the property.
San Antonio homeowners weighing budget against longevity on expansive clay will find that one method usually pulls ahead once a professional inspection identifies the underlying cause.
Skip the guesswork and let qualified professionals assess your slab firsthand. Get matched with vetted Foundation Repair in San Antonio, TX via our -matching form and compare written estimates from local specialists.