Sunken driveways, tripping sidewalks, tilted patios, and settled garage slabs — lifted back to level with high-density polyurethane foam or traditional mudjacking. Cures in 15 minutes. Drive on it the same day.
A licensed local crew — usually out in 24 to 72 hours. Written scope, fixed price, no pressure.
Concrete lifting in Concord comes up two ways. The obvious way is an exterior slab problem — a driveway approach that has sunk two inches at the garage lip, a walkway that catches every foot in the winter, a patio that has settled toward the house and now runs water at the foundation wall every time it rains. The less obvious way is an interior partial-slab issue on the newer subdivisions along Poplar Tent Rd and Kannapolis Pkwy where the builder poured a monolithic slab under a garage or a bonus room but left a crawlspace under the main house — those transition points settle differently on Cabarrus red clay and you get cracked slabs, popped floor tiles, or a garage floor that is now sloping the wrong way. Either way the fix is polyurethane injection, done right, from a contractor who knows what is under the slab and how the soil moves.
Last October I did a driveway approach on a 1997 house in Christenbury off Poplar Tent Rd where the garage-slab-to-driveway transition had settled 2-3/4 inches over the previous decade. The homeowner had two teenagers backing cars over that lip every day and both had cracked a bumper cover on it. We drilled a 5/8-inch injection pattern along the failed edge, ran HMI TerraThane 24024 polyurethane through the ports, and lifted the slab back to within 1/8 inch of level in about ninety minutes. The homeowner drove over it that afternoon. Two years since and it has not moved. That is the polyurethane playbook — fast, targeted, drives on same day. Mudjacking is a dying technology in this market and we do not offer it.
What follows is what I actually do on Concord concrete lifting jobs, how the Cabarrus County red clay soil profile drives the material spec, and why the transitions between poured slab and crawlspace foundation on subdivision houses are the most common place we get called. Free on-site inspection anywhere in Concord, Harrisburg, Kannapolis, and out to Huntersville across the county line.
Every Concord concrete lifting job starts with a probe survey before I write a scope. I walk the slab, note the settled elevations relative to fixed reference points (garage lip, house threshold, existing sound sections), check the perimeter for visible voids where the slab has separated from the surrounding earth, and sound the slab with a hammer for hollow spots that indicate voids under the pour. On a typical Christenbury or Cox Mill driveway approach we find 2 to 4 inches of total settlement with the deepest point at the garage lip transition and progressive lift back toward the street side. The void under the slab is usually 1 to 3 inches at the low point and tapers to zero at the sound section.
Then we plan the injection pattern. Standard grid is 3-foot to 4-foot centers with tighter spacing at the perimeter of the settled section and at any visible crack. 5/8-inch injection ports drilled through the slab, spaced to allow uniform lift distribution without over-lifting any single point. Polyurethane injection is a controlled slow lift — the material expands over 30 to 90 seconds after injection and the technician monitors the slab elevation with a straight edge and a laser reference to hit the target lift without overshoot. HMI TerraThane 24024 is our default material for exterior slab work in this market because it cures fast enough for same-day drive-on and it does not react to the moisture in Cabarrus red clay the way some competitor polyurethanes do.
Interior partial-slab work on subdivision houses is a specialized subset. A 2000s Christenbury or Cox Mill house often has a monolithic slab under an attached garage or a bonus room with the rest of the house on crawlspace. The transition where the slab meets the crawl foundation wall is a differential settlement zone — the slab moves on the soil below it, the crawl foundation moves on its footings, and after 15 to 20 years the two do not agree. You see cracked floor tile on the garage-to-house step, or a bonus-room floor that has developed a subtle slope toward the exterior wall. The fix is the same polyurethane injection process but with careful attention to any interior finishes above the slab — we drill through carpet without damaging it, we drill through vinyl and LVP with a technique that lets the puncture close after the injection port is filled, and we drill through tile only when the homeowner has replacement tile on hand.
Cabarrus County does not require a permit for polyurethane slab injection on residential property. It is not a permitted trade in North Carolina. Where we do coordinate with the county is if the slab lift is going to affect exterior drainage or grading in a way that shifts water toward a neighbor's property — that comes up occasionally in Christenbury and Cox Mill where lots are close together and any grade change at a driveway apron affects the neighbor's yard drainage. We check that before the job and we plan around it.
Material is HMI TerraThane 24024 polyurethane for the vast majority of Concord jobs. It is a 4 to 5 pound density closed-cell polyurethane, hydrophobic (does not react with soil moisture), cures to structural load capacity within 15 to 30 minutes, and supports vehicle traffic within an hour. On heavier commercial-grade lift work or on interior slabs with unusual load requirements we spec TerraThane 25040 which is a higher-density material at 5 to 6 pounds. Both come in a two-part injection system that the technician mixes at the injection port, so there is no premixed pot life to work around and no waste.
Injection ports are 5/8-inch drilled through the slab with a rotary hammer, spaced on a 3-foot to 4-foot grid with tighter spacing at perimeter and crack locations. Ports get sealed after injection with a color-matched patch — gray on exterior driveways and walks, custom-matched on interior slabs where the finish will show. Equipment is a truck-mounted injection rig with heated hoses for material temperature control (polyurethane reaction chemistry is temperature-sensitive and cold weather requires preheating the material to hit the correct expansion profile).
Reference brands and materials we do not use: we do not mudjack. Mudjacking uses a portland-cement-and-sand slurry pumped through 1-1/2-inch ports and it works fine on paper but the slurry is 100-plus pounds per cubic foot which loads the underlying soil in the same way that caused the settlement in the first place. The concept is self-defeating on Cabarrus red clay. Polyurethane at 4 to 5 pounds per cubic foot loads the soil at a fraction of the original slab weight. That is the whole reason it holds. Long-term, mudjacked repairs in this market fail again within 5 to 10 years. Polyurethane holds indefinitely absent new soil movement.
Yes — Concord is a regular concrete lifting route. Free on-site inspection anywhere in Concord, fixed written quote before we touch anything.
Concord concrete lifting is dominated by driveway approach and garage-transition settlement on the 1990s-2010s subdivision belt (Christenbury, Moss Creek, Cox Mill, Robinson Church) where builder-grade lot preparation on Cabarrus red clay has moved after 20-plus years. Downtown historic properties see less slab work because most exterior walks and drives predate the poured-slab era, but the odd 1960s garage floor comes up periodically.
28025, 28027. All Cabarrus County addresses covered.
Yes. That is one of the most common calls we get in the Poplar Tent Rd subdivision belt. Standard fix is a polyurethane injection grid drilled through the settled section, HMI TerraThane 24024 material, controlled lift back to within 1/8 inch of the original elevation. Typical job is 60 to 120 minutes on site. You can drive over it an hour after the last injection. No permit required, no return trip. Fixed written quote after a free on-site inspection.
Because mudjacking loads the underlying soil at essentially the same weight as the original concrete slab. On Cabarrus red clay that caused the settlement in the first place. The concept is self-defeating in this market — the slurry-lifted slab sinks again within 5 to 10 years because the soil that could not hold the original slab weight cannot hold the added slurry weight either. Polyurethane at 4 to 5 pounds per cubic foot loads the soil at a fraction of the original slab. That is why it holds. We would rather quote you an honest polyurethane job that holds than a cheap mudjack job that fails inside a decade.
Depends on the finish. Carpet drills clean — we lift a small section, drill through the concrete, inject, patch the port, lay the carpet back. LVP and vinyl drill through cleanly with a technique that lets the puncture close over the port patch. Tile is the hardest — we can drill through it but you have to have replacement tile on hand because the tile at the port location is usually going to crack. Hardwood we work around by injecting from the exterior side or from an adjacent room where we can access the slab from underneath finished floor. Every job we plan the drill pattern with the homeowner walking through beforehand.
Not the process, but the material selection matters. Cabarrus red clay holds moisture in ways that can react with some cheaper polyurethanes and cause premature expansion during injection or moisture absorption post-cure. HMI TerraThane 24024 is hydrophobic and does not react with the clay moisture — that is why we spec it. Also, Cabarrus County sits closer to the Uwharrie fall line than central Mecklenburg, so you get more variable soil in a single subdivision. Christenbury and Cox Mill both have pockets where drainage patterns are unpredictable because the underlying grade transitions from clay to weathered granite within a single street. We do a soil probe on the inspection to confirm we are working with clay and not hitting rock at 18 inches.
Free on-site Concord inspection. Fixed written quote. Call (980) 227-1769 or book below.