Polyjacking Lifts Concrete Without Tearing It Out
If your concrete is still in good enough condition to save, we may be able to level it instead of replacing it. Crawl Space Ninja uses polyurethane foam injection, commonly called polyjacking.
We create small access points in the concrete and inject polyurethane beneath the slab. As the material expands, it fills voids and allows us to carefully lift the concrete toward its proper elevation.
Polyjacking gives us several advantages:
- Controlled lifting: We can make careful adjustments to settled sections.
- Void filling: Polyurethane fills unsupported areas beneath the slab.
- Fast curing: The material cures quickly, reducing downtime.
- Less demolition: Structurally suitable concrete stays in place.
- Reduced waste: You avoid removing and disposing of an entire slab.
That can be particularly useful around established Knoxville properties where you don’t want a repair turning into a major demolition project. From older homes near Broadway and Central Street to properties around Cherokee Boulevard, saving usable concrete can keep the work much more contained.
Leveling Sunken and Uneven Driveways
Driveways are one of the first places homeowners notice concrete settlement. You may feel a bump every time you pull into the garage or see one slab sitting noticeably lower than the next. We can use concrete leveling to address:
- Uneven transitions between driveway sections
- Slabs that have dropped below adjoining concrete
- Low areas that affect how water drains
- Voids beneath otherwise usable driveway concrete
- Changes in elevation that create rough transitions
Knoxville’s sloped terrain makes drainage important. We check how rainwater moves around the driveway and whether it may be washing away support beneath the slab.
Sidewalk and Walkway Leveling
A sidewalk doesn’t have to sink very far before one edge sits higher than the next. That uneven transition can become a trip hazard and make an otherwise good walkway difficult to use.
Concrete leveling may help with:
- Sunken sidewalk sections
- Uneven joints between slabs
- Front walks that have settled
- Concrete approaching porch steps
- Walkways that no longer meet adjoining surfaces correctly
This is where Knoxville’s older neighborhoods give us a different type of job. Fourth & Gill and Old North Knoxville developed long before today’s automobile-centered subdivisions. Walkways, sidewalks, porches, alleys, and homes can sit relatively close together.
Rather than removing an entire section of otherwise usable concrete, polyjacking gives us a way to work beneath the slab and correct its elevation with less disruption to the surrounding property.
Patio and Porch Concrete Leveling
Patios and porch areas can settle too. Sometimes one corner drops. In other cases, a section moves enough to create an uneven transition or change the direction water travels.
We evaluate:
- Sunken patio slabs
- Uneven porch concrete
- Low sections near exterior doors
- Concrete pulling away from adjoining surfaces
- Areas where settlement has affected drainage
Around established neighborhoods like Island Home, porches and outdoor spaces are part of homes dating back generations. Newer Knoxville properties may have larger patios and different backyard layouts. Either way, we first determine whether the slab is structurally suitable for lifting.
Pool Deck Leveling
Uneven concrete around a pool deserves attention because small elevation changes can create noticeable walking hazards. Around Knoxville, pool decks may sit on sloped properties in areas such as Bearden, Sequoyah Hills, and Northshore Drive, where changing grades can affect how water moves around the pool. Heavy rain can also expose low spots, wash soil from beneath the slab, or leave one section sitting lower than the next.
Pool deck leveling can help correct:
- Settled sections around the pool
- Uneven transitions between concrete panels
- Voids underneath suitable slabs
- Low areas caused by concrete settlement
Properties farther west around Bearden, Northshore Drive, and the greater West Knoxville area can have very different grades from flatter lots closer to downtown. We look at those surrounding conditions when evaluating pool deck settlement, particularly when runoff or drainage may be affecting support beneath the concrete.
Our goal is to restore a more even surface while keeping as much of the existing pool deck intact as possible.
Basement Floors and Other Concrete Slabs
Polyjacking isn’t limited to exterior flatwork. Crawl Space Ninja can also evaluate basement floors, slab foundations, and other appropriate concrete surfaces. The process can be useful for:
- Settled basement floor sections
- Appropriate slab foundation applications
- Interior concrete with voids beneath it
- Larger slabs that qualify for polyurethane leveling
Knoxville’s underlying geology varies across the area and includes limestone, dolomite, shale, and sandstone. We don’t assume that regional geology explains why a particular slab moved. We inspect the actual conditions underneath and around your concrete before recommending a repair.
That matters whether we’re working near Holston Hills east of downtown or farther west along the Kingston Pike corridor.
Concrete Leveling Services in Knoxville, TN
Sunken concrete does not always need to be demolished and replaced. If the slab is still structurally sound, polyurethane leveling may provide a faster, less disruptive repair while reducing concrete waste and preserving the existing surface.
However, severely cracked or deteriorated concrete may require replacement. Crawl Space Ninja’s Knoxville team evaluates the slab, surrounding grade, drainage, and conditions beneath the concrete before recommending the right solution. Whether we’re inspecting a driveway in South Knoxville, a sidewalk near Broadway, a patio around Bearden, or settled concrete near Northshore Drive, we focus on understanding why the slab moved and determining whether it can be effectively leveled. Contact us online to schedule your concrete evaluation with our Knoxville team.
