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.
A call last April off Ridgelake Dr in Lake Forest Preserve, full-brick two-story finished in 2009, three-car side-load garage, and the reason the owner called had nothing to do with concrete. He wanted a price on a dehumidifier. His crawl had been running in the high eighties all summer, his inspector had written it up, and somebody had already told him what unit to buy.
I looked at the crawl and then I went back outside and looked at the driveway, which is where the answer was. The apron at the garage doors and the two panels behind it had gone over. So I set the rotary laser on the garage slab, aimed the run out toward Ridgelake, and walked the receiver down it. The apron was down an inch and five eighths. The panel behind it about an inch and an eighth. The last ninety feet out at the street had not moved a hair since the day it was poured. Everything that landed on roughly six hundred square feet of driveway was now running back at the stem wall and standing there.
Then the soil probe, which is the test that actually settles it. Down by the street it stopped cold at roughly thirty inches, red clay grading into weathered rock exactly the way that profile is supposed to read. Along the house it dropped past five feet with almost nothing pushing back. That is the over-dig. When the excavator cut the hole for that foundation he cut it wider than the footprint, because you have to in order to form and strip the wall, and then he pushed the spoil back into the trench outside the footing and left it. Nobody compacts that in lifts on a production schedule. Four months later the flatwork crew poured a driveway over the top of it. The half sitting on undisturbed ground has not moved in sixteen years. The half sitting on backfill has been consolidating the entire time.
We lifted it on a Wednesday. He got his crawl humidity back into the fifties without buying anything that plugs into a wall, and I told him to spend the dehumidifier money on gutters for his shop.
That is the thesis and I am putting it up front: out here, lifting concrete is drainage work. On a one-to-three-acre lot in a town with no curb, no gutter and no storm sewer anywhere in it, a tipped slab is not a cosmetic problem. It is a funnel with a target, and the target is your foundation.
Now the second pattern, because this town hands you a mechanism most markets do not. Two months later I was on a three-hundred-foot asphalt-to-concrete drive off Beulah Church Rd, and the settlement was a band. Not a corner, not an edge, a strip about four feet wide running clean across the drive at an angle, with good concrete on both sides of it. That is never consolidation and it is never soil. That is a trench. Out here the candidates are short: the water line running from the wellhead to the house, the sewer line running from the house to the septic tank, the electrical feed to the barn, or a propane line. Every one of those was cut through undisturbed clay, sleeved, and backfilled by hand. The probe found it in about four minutes. On that particular job the line under it was also weeping, which meant lifting the concrete first would have been the wrong order of operations, and I said so.
And there is a third mechanism that catches people, which is that a slab out here can move without anything being wrong. Clay out here does not hold still. It drinks through a wet Piedmont spring and swells, then dries down through August and shrinks back, and on its way down it lets go of footings and pier bases. Union County has a real drought history, restrictions and all, and the dry year followed by the wet year is exactly the cycle that cracks piers and walks porch slabs away from houses. I have shot a farmhouse porch slab on Potter Rd in September, shot it again the following April, and found half the drop had come back on its own. On a borderline case I would rather read it twice across seasons than sell you a lift that the weather was going to undo.
Everything else on the list is the ordinary catalog, only on a larger scale out here. An apron parted from the stem wall with a shadow line under the door seal that has no business being there. A front walk heaved up by a hundred-year-old oak. Farmhouse porch slabs from the thirties set down on bare graded clay with not one shovel of stone beneath them. Patios pitched back toward the house instead of away. Pool decks working against their coping. Equipment pads leaning at angles no compressor was ever designed to run on. Hangar and pole-barn aprons pouring their runoff back toward the dwelling. One mechanism underneath all of it: concrete that used to bear on dirt is now bearing on nothing.
The reason it reads as a Weddington problem in particular comes down to the parcel. Long private drives, big flatwork areas, foundations over-dug on hillside pads, utility trenches running everywhere because there is no municipal line at the street to tap, a permitted drainfield you cannot drive equipment across, a wellhead with a setback, and clay that will not take water. What follows is the mechanics of the lift, the way this polymer behaves in Piedmont ground, a neighborhood-by-neighborhood read on where the settlement actually runs, the real permit and right-of-way picture, and the section almost nobody else publishes, which is the list of slabs I will tell you to replace or simply leave alone. Turning a job down is cheaper for both of us than driving back out.
In Weddington a settled slab is almost always a drainage problem, an over-dig backfill problem, or a utility-trench problem — never a cosmetic one. On a one-to-three-acre parcel with no curb, no gutter and no storm sewer, tilted concrete is a funnel with a target, and the target is your foundation or your septic reserve area. The list below is the mechanism pattern I actually see on 28104 and 28173 parcels.
Highgate driveway apron settled an inch and a half into the over-dig wedge beside the stem wall, now sheeting rain water back at the crawl foundation and the perimeter grade.
Aero Plantation hangar apron off Eagle Rd or Skytop Rd dropped at the door and pushing runoff back under the barn or hangar toward the crawl and the wellhead setback zone.
Beulah Church Rd farmhouse porch slab set on graded clay in the 1930s with no stone bed, riding shrink-swell every drought-to-wet cycle and pulling away from the sill.
Long private drive off Twelve Mile Creek Rd with a four-foot settlement band running clean across at an angle — a well-line, septic-lateral or barn-feed trench never compacted in lifts.
Pool deck in Lake Forest Preserve or Providence Downs South working against the coping on Helena clay, sealant joint at the shell parted after two wet-dry cycles.
AC condenser pad or barn equipment pad tilted on unamended Cecil clay near the drainfield, where lifting equipment cannot cross the mapped reserve area without ending the system.
Out here a slab that has dropped is rarely just an eyesore, and more often than people realize it is the reason the crawl underneath the house will not dry out. Precipitation runs the mid-forties in inches and it is not spread evenly, with the heavy stretch landing May through August, which is exactly when summer dew points sit in the sixties and seventies and a vented crawl is already losing. Flip the pitch on an apron and every one of those storms gets pointed at the block during the exact stretch of calendar when the crawl can least afford it. The water reaches the wall, works in beneath the vent line, and before long a salesman is writing you a number for machinery. Sometimes you genuinely need the equipment. But if the driveway is pointed at the stem wall, that dehumidifier is running against a tap nobody turned off.
The scale of it is what people underestimate here. A three-hundred-foot private drive plus a turnaround plus a parking apron is a serious collection area, bigger than the roof on plenty of houses, and unlike a roof it has no gutters. Add a detached shop or a barn with its own slab and apron and you are managing several thousand square feet of hard surface on a parcel where every drop has to be dealt with on your own land. There is no curb line to carry it away and no inlet to drop it into. Whatever the concrete sheds, your dirt has to accept.
Toe-catchers arrive sooner than people think. A quarter of an inch of offset between two walk panels is the number usually cited as the point where a walking surface turns into a hazard, and that is not much drop at all. Out on private acreage nobody mails you a citation about it. You are simply the person standing there when a delivery driver goes down on a walk that cannot be seen from the road. It matters more than it sounds like it does on parcels where the mail, the propane truck, the well service and the septic pumper all walk the same path.
The problem also grows on a timetable. A panel that drops takes the shared edge support out from under its neighbors, which had been spreading load across that joint, and the neighbors respond by cracking along it. One bad section turns into three over two or three winters. Freeze-thaw drives that, and here is a genuinely local wrinkle: Weddington has no urban heat island. Open pasture, tree lines and one-to-three-acre setbacks radiate hard on a clear winter night, so overnight lows on these lots regularly run colder than the same night a few miles up the road inside the metro. That means more radiational frost events and more shallow freeze-thaw on exposed pier bases, porch footings and step footings than the built-up areas ever see. Minimum footing depth for this region under Table R301.2(1) of the 2018 residential code is twelve inches below finished grade, and on pier retrofits out here I go deeper than the minimum, because those piers are bearing on shrink-swell clay rather than on rock.
Layered on top of all of that is the annual shrink and swell. Spring rain, and the clay bulks up and pushes on whatever it touches. Late summer, and it pulls back and leaves that same thing unsupported. The uplands are Cecil, Appling, Pacolet and Wedowee, all slow, and the low spots and drainageways are Helena and Iredell, which are slower still and higher in shrink-swell. Concrete resting on those soils goes through every step of that cycle with them. In an ordinary year it finishes close to its starting elevation. In an unusual one it does not, and whatever is left over stays left over.
Then the failure modes that are not about the house. A pool deck that has gone out of level starts working against the coping and pulls the sealant joint at the shell apart, and there is no shortage of pools on these lots. Tip a condenser more than a couple of degrees and the compressor is running outside the range its oil was designed for, which shortens its life considerably, and good luck getting a warranty claim honored on a unit that failed while sitting on an obviously crooked pad. A barn apron or a hangar slab that has dropped at the door stops draining and starts pushing water back under the building, and on a horse barn that means a wash rack draining the wrong direction into a stall row. Equipment loads matter too: a loaded horse trailer, a fuel delivery truck or a septic pumper on a drive that is already hollow underneath is how a hairline crack becomes a broken panel.
And a settled slab is information, which is the part I care most about. On a cut-and-fill pad in one of the 1995-2015 custom neighborhoods it is telling you where the over-dig backfill sits. On a straight band across a long drive it is telling you a utility trench is under there, and out here that trench is a well line, a sewer line to the tank, a barn feed or a propane run, any of which can be leaking. On a 1930s farmhouse porch it is telling you the slab was poured on graded clay with no stone and has been riding the seasons ever since. On ground near a drainfield it may be telling you the field is saturated and the soil under the concrete has lost its bearing. Raise the slab without listening to what it told you and you will be paying somebody to raise it a second time. I would rather get it right on the first visit.
One more that only applies in a town like this: compaction. Equipment does not cross a drainfield or a mapped repair area, ever. A drainfield works because the soil around the trenches is porous, and driving a loaded truck over it can end that system permanently. That constraint decides where I stage, where I run hose, and sometimes whether a particular slab can be reached at all without a longer hose run and a slower day. It goes in the plan before it becomes a problem.
Same steps every job. No shortcuts.
I pull the parcel identification number off the county GIS layer to confirm which county actually has jurisdiction, because the northern edge of 28104 crosses the county line and USPS commonly reads that ZIP as a different town on the envelope. Where the driveway apron meets a state-maintained road, an NCDOT encroachment agreement governs any work behind the pavement edge; inside the gated communities off Twelve Mile Creek Rd, Marvin School Rd and Antioch Church Rd the road is association-owned, so the declaration decides.
On slow Piedmont clay a slab that keeps dropping usually has a live source underneath: a weeping well line, a leaking sewer run to the septic tank, a downspout dumping under the edge, or a saturated drainfield that has lost bearing. I probe, pressure-check where warranted, and refuse to lift over ground that is still washing away. Erosion strips material out from under whatever I put there and buys you a delay, not a repair.
Equipment does not cross the drainfield or the mapped reserve area, ever, and does not park on the tank lid. Locations are pinned on the plot from the septic permit before the day of the lift. Where the only route to the concrete would cross a permitted system, we take the long way with extra hose and accept the slower schedule. On the far parcels toward Mineral Springs and Unionville I bring a generator and my own water rather than counting on hitting a spigot and a receptacle where I need them.
Raising a slab back to its original elevation adds no load and no footprint, so it typically sits outside the Union County building permit process. What crosses that line is (a) exterior regrading, swale cutting or french-drain work, which trips a land-disturbing Notice of Intent and a Certificate of Coverage under NCG01 before the Town of Weddington issues the zoning permit, and (b) any structural rebuild of a porch, stoop or pier, which is a Union County Building Code Enforcement permit out of 500 N Main St in Monroe with inspections behind it.
On the tall-crawl and hybrid crawl-to-basement customs from 1995 through 2015, the wedge of uncompacted spoil outside the foundation runs four to seven feet deep, and a shallow lift alone will call me back. Small probes are driven down and structural polymer placed from the bottom upward to tighten the loose column. Where a settled porch or stoop is tied to a moved pier or foundation element, the lift is only half the story, and the support fix is a separate permitted scope.
Union County maintains water-supply watershed overlays over the Twelve Mile Creek and Six Mile Creek basins, plus mapped 100-year floodplain the county has been revising. Built-upon-area limits and stream buffer setbacks apply. Anything downslope of Twelve Mile Creek Rd or North Twelve Mile Creek Rd gets the county GIS layer pulled up on my phone before we lay out even a short french drain, because lifting existing concrete adds zero impervious surface while replacement pours do not.
There are two ways to put a slab back where it belongs, and on residential parcels in this part of the county I reach for one of them almost every time. Polyurethane injection, which people also call polyjacking, works through holes about the diameter of a pencil eraser. A diamond bit cuts them, the gun threads into the hole, and a two-part expanding polymer goes in and reacts in the ground beneath the concrete. I set those holes in a pattern rather than a line, closer together out where the drop is worst and along the slab edges, further apart across the middle where the concrete still has dirt under it. A two-car apron usually takes somewhere in the neighborhood of four to eight dozen. Diamond cutting leaves a crisp round edge instead of a chipped crater, and each hole gets capped with a rapid-set patch tinted to the concrete before I leave.
The workhorse material for drives, walks and patios is TerraThane 24024 from HMI, a four-pound lifting polymer. It is closed-cell, it sheds water instead of absorbing it, and once it has cured it does not care about soil pH, tree roots growing against it, or the freeze cycles this open country delivers, all of which matter when the ground it sits in swings as far as this clay does. When a slab is long and I need the material to run farther under it before it starts to rise, I switch to PolyLevel PL-400, which kicks more slowly. Denser formulations get pulled out for slabs carrying real weight or sitting in wet ground, so garage floors, pool decks and barn or hangar aprons, and anything down in the Helena and Iredell pockets along the drainageways or below a creek bottom.
What makes this a controllable process rather than a hope is knowing how the stuff behaves once it is out of the gun. The two parts combine at the tip, generate their own heat, and grow to many times the volume they went in as, all inside a few seconds. Here is the useful part: the polymer runs wherever it is easiest to run, so it seeks and stuffs the empty space first. Nothing above it moves while there is still air to fill. Only once that space is packed solid does the concrete begin to travel, and by then the movement is gradual enough that I can stop it whenever I want. My receiver stays clamped to the edge of the panel the entire time, and I take the lift in small increments spread across many holes instead of leaning on any one of them. That is also why a panel already broken into loose fragments is a poor candidate. Fragments do not share a common elevation, so there is nothing to hold steady.
Getting back on the concrete is where the polymer pays for itself on a working property. It is at something like nine-tenths of its strength a quarter hour after it goes in, and it will take a vehicle within the hour. The older approach, mudjacking, pushes a limestone-screenings slurry through holes several times larger, and the slab is off limits for the better part of a day while that slurry sets. I am not here to tell you mudjacking is dead. On a big interior shop or equipment-building floor where nobody cares what the patches look like and the cavity underneath is measured in cubic yards, it is still a sensible choice, and there is no shortage of those buildings on these parcels. The problems out here are three. The slurry has real mass, and you are asking the same failed backfill or the same shrink-swell clay to hold it up. The holes are the size of a coffee mug lid and read that way on a visible driveway forever. And a slurry can compress under years of loading and let the panel drift back down, which on a drive that regularly carries a loaded horse trailer or a fuel delivery is a practical concern rather than a theoretical one.
Filling a cavity is not the same product as raising a slab, and it gets priced on its own line. Plenty of concrete out here is still sitting at the right elevation with nothing but air holding station underneath it. You hear it before you see it, a hollow report under the hammer where the neighboring panel rings solid, and you feel it when a truck goes across and the panel flexes. That flex is what eventually splits it. In that situation the polymer goes in slow and light with no elevation target at all, just enough resistance coming back through the gun to tell me the space is full and the concrete has continuous bearing again. Attached garage floors in the 2000s and 2010s houses are the version of this I see most, perfectly flat at the door with a cavity underneath, because the fill inside the stem wall kept settling while the slab spanned it.
Deep injection is the technique that matters most on Weddington parcels. Instead of treating only the inch or two immediately under the concrete, small probes are driven down several feet and structural polymer is placed from the bottom upward, tightening an entire loose column of soil. That is the honest answer to an over-dig wedge outside a foundation wall, and on the tall crawls and the hybrid crawl-to-basement foundations common here that wedge can run four to seven feet deep. Put a shallow lift on top of a deep uncompacted wedge and you will see me again. If the probe readings show me that is the situation, you hear it at the assessment, not on the follow-up call.
Cleanup means every hole capped in a matching tint, then the movement joints and control joints re-sealed, generally with SikaFlex-1a and occasionally with Titebond WeatherMaster where the joint geometry favors it. If a settled porch or stoop is tied to a pier or a foundation element that has moved on its own, then the flatwork is only half the story and I will say so out loud. Holding that support back up is a different scope, done with something like a Tiger Foundation SmartJack or a Grip-Tite adjustable post bearing on a proper footing, and unlike a lift it does come with a permit path.
Site logistics, which on acreage like this take up half the planning. The rig stays off the drainfield and off the mapped repair and reserve area without exception. Those trenches work because the dirt around them stays open and porous, and one pass with a loaded truck can end a septic system permanently. The tank lid gets the same treatment; it is not somewhere to park. So the first thing that happens on the day is locating the tank, the field, the reserve area and the wellhead, and when the only route to the concrete runs across one of them, we take the long way with extra hose and accept the slower day. On a drive three hundred feet from the road, that hose distance is a scheduling fact, not a detail. Out on the far parcels toward Pleasant Grove Rd, Lee Massey Rd and the Unionville farm roads, the buildings sit far enough from each other that I bring a generator and my own water rather than counting on finding a spigot and an outlet where I need them. Behind the gates off Twelve Mile Creek Rd and Marvin School Rd, entry gets arranged with the association days ahead, because sorting it out at the callbox burns a morning.
Two more things I run into constantly on these properties. Where a concrete drive meets gravel, the gravel has been bladed and topped up a dozen times over the years and now stands proud of the concrete, so the last panel is holding back a stone dam that keeps water sitting against it. Raise that panel without cutting the gravel back and you have accomplished nothing. And the culvert under the drive at the road gets looked at on every visit, because when it silts up or crushes, the ditch backs up and the water goes underneath the first stretch of your driveway.
Right-of-way is a question with an answer, and it gets answered first. Before a bit touches a panel near the street I find out whose ground that is. A lot of the through-roads in this area are state-maintained, which puts the shoulder and a strip behind it in public right-of-way where an encroachment agreement governs any work. Inside the gated neighborhoods the pavement usually belongs to the association instead. On unplatted acreage, the apron where your drive meets the road can sit partly inside a public easement even if your family has mowed and plowed it for two decades. Sorting that out beforehand costs a phone call. Sorting it out afterward costs considerably more.
The slabs I turn down, said plainly. Concrete that has come apart into loose pieces goes up in loose pieces and the cracks between them get wider, not narrower. A surface that is spalling and delaminating will keep shedding regardless of how solid the bearing underneath becomes. A slab being pushed by a live root will get pushed again, so either the root is addressed first or the lift is a rental and you will hear me call it that. And nothing gets lifted over ground that is still washing away, whether the culprit is a weeping well line, a failing sewer run to the tank, a downspout dropping water under the edge of the concrete, or a drainfield so saturated it has taken the bearing out of the soil. Erosion keeps stripping material out from under whatever I put there, and the only thing you would have purchased is a delay.
On material and dates: lifting polymer is not stocked anywhere in this county. Drums arrive by truck out of a supply house north of the county line, which is why I put a little slack at the front of the schedule instead of promising a start date on material that is still in transit. Builders FirstSource over on Airport Rd in Monroe handles treated posts, beam stock and framing when something structural rides along with the concrete work. Consumables, patch material and sealant come from the pro desks in Indian Trail and Waxhaw.
Start with the permit question, because it gets answered wrong constantly and the honest answer is simple. Raising a slab on your own residential property usually falls outside the building permit process entirely. Nothing structural is being added, no load is being added, no footprint is changing. No load is added, no framing is touched, and the footprint is unchanged, so restoring a slab to the height it started at simply is not an activity the building code reaches, and I am not going to inflate it to sound impressive.
What matters is knowing where the line is, because around here the scope can walk across it fast. Three things do it. First, exterior grading and drainage. If correcting the water means cutting a swale, running a french drain, or reshaping a slope, that is land-disturbing work, and this town has a specific sequence for it. Zoning is the only permit the Town of Weddington hands out; building permits are not part of what Town Hall does. And when the work disturbs soil, the Town will not release even that zoning approval until an electronic Notice of Intent has been filed and a Certificate of Coverage under the state NCG01 permit has come back. Miss that order and the calendar goes sideways. Second, structure. If a settled porch slab turns out to be a settled porch foundation, or a stoop needs rebuilding, or a pier needs replacing under the load, that is a Union County building permit out of Building Code Enforcement at 500 N Main St in Monroe, with Union County inspections behind it. Third, anything that touches the wastewater system. Union County Environmental Health at 500 N Main St, Suite 47, requires an existing-system inspection before it will permit additions, decks, porches, pools and detached buildings, so a project that starts as a tilted patio and becomes a rebuilt porch or a new pad for a shop has that office in the path.
Built-upon area is the constraint people in this county do not see coming, and it is the one that most favors lifting. Union County maintains water-supply watershed layers over the Twelve Mile Creek and Six Mile Creek basins, plus mapped FEMA floodplain that the county and FEMA have been revising. Those overlays carry built-upon-area limits and stream buffer setbacks. Raising concrete you already own adds exactly zero impervious surface, which means a lift stays clear of that math entirely. Tearing the same slab out and pouring a wider one does not. Neither does adding a turnaround, a parking pad, a court or a new barn apron. So on a parcel already near its limit, or inside a stream buffer along Twelve Mile Creek or Six Mile Creek, lifting is not just the cheaper path in labor terms, it is frequently the only path that does not require a conversation with the county. Any parcel sitting below Twelve Mile Creek Rd or North Twelve Mile Creek Rd gets pulled up on the county GIS layer and read for floodplain and buffer before I lay out one foot of drainage.
Right-of-way and who owns the apron. A driveway apron is the most commonly disputed twelve feet of concrete on any property. Ownership there is a records question rather than a common-sense one. I pull the parcel on the Union County GIS layer, read the recorded plat where one exists, and where the road is state-maintained I treat everything from the pavement edge back through the NCDOT right-of-way as somebody else's concrete until the map says otherwise. Inside the gates it is the association's declaration that decides, and those declarations are not interchangeable from one community to the next. On the older acreage there is frequently no plat at all, just a deed description and a road that got widened at some point nobody living remembers. That research happens before a drill touches a street-side panel rather than after, because an encroachment problem discovered mid-job stops the job where it stands.
Jurisdiction, and why the mailing address will not tell you. The northern edge of the 28104 boundary crosses the county line, so a sliver of 28104 and parts of Stallings sit in the next county over, with an entirely different building department behind them. On top of that, the USPS-preferred city name on 28104 is frequently Matthews rather than Weddington, which means a parcel lookup done by mailing address will regularly land you on the wrong desk and occasionally on the wrong county. I pull the parcel before I quote a path. Around the ring, Marvin, Wesley Chapel, Waxhaw, Stallings, Indian Trail, Lake Park, Hemby Bridge, Mineral Springs and Unionville each run their own zoning desk with Union County handling building and environmental health behind them, while Monroe operates its own inspections department, and unincorporated county parcels are county for all three.
Covenants and gates, which are the real scheduling constraint. Lake Providence runs an architectural review board and cares about anything visible outside. Skyecroft off Twelve Mile Creek Rd and Providence Downs South off Marvin School Rd are gated with active associations, so access and staging get arranged in advance. Active associations govern The Falls at Weddington, Lake Forest Preserve, Highgate, Hunter Oaks, Weddington Trace and Cureton as well. Then the opposite: the acreage along Beulah Church Rd, Deal Rd, Potter Rd, and nearly all of Unionville and rural Mineral Springs, is unplatted with no covenants at all, which makes the work simpler and also means there is no association to coordinate with when your uphill neighbor's drive is delivering water to your slab.
Now the ground itself, because it explains most of what you are looking at. The uplands here are Cecil, Appling, Pacolet and Wedowee, kaolinitic red clay subsoils over weathered rock. That is why a probe hits refusal at thirty inches on one side of a driveway and drops five feet on the other: one side is undisturbed profile and the other is backfill. The problem series are Helena, which sits along the drainageways and in shallow depressions with a high-clay subsoil, slow permeability and high shrink-swell, and Iredell, which shows up poorly drained in the same low spots. On a two-acre parcel you can have perfectly serviceable bearing at the house pad and a depression a hundred and fifty feet away that holds water from December to March.
Drainage sorts into two basins. Twelve Mile Creek and its tributaries drain nearly all of this township, and Six Mile Creek drains the far northwestern corner. Both carry mapped one-hundred-year floodplain. Which one your lot sheds toward determines where a corrected discharge can legally daylight, and on a parcel with a well, a drainfield and a mapped reserve area already claiming the good ground, that is a short list. There is no storm sewer to fall back on. Everything the concrete rejects has to be absorbed or conveyed on the property, and on ground that will not perc that is a design problem rather than a shovel problem.
Last, the elevation and the cycle. This is high ground for the region at roughly six hundred sixty-six feet with no urban heat island over it, so the frost behavior on shallow bearing is more aggressive here than the regional averages suggest. And the county has a documented drought history, including a stretch severe enough to force restrictions and a rate restructure, followed by wet years. Dry shrinks the clay away from footings, wet swells it back, and the slab on top of it records every round.
Concrete settlement in this part of Union County sorts into seven patterns, and I can predict most of a job from the address plus one question about the parcel. Here is how they actually run.
One. Long private drives on the 1995-2015 custom belt, where the story is over-dig and cut-and-fill. This is the bulk of my work. Former pasture cut into one-to-three-acre lots, big houses set well back, and two to four hundred feet of drive between the road and the garage. Lake Forest Preserve off Weddington Rd and Cox Rd is the clean example: roughly two hundred eleven full-brick and craftsman homes on Lake Forest Dr, Ridgelake Dr, Twin Lakes Dr and Weddington Lake Dr, several of them hybrid crawl-to-basement foundations on the sloped lots, which means the excavation was deep and the backfill wedge outside the wall is deep with it. The garage end of the drive goes down while the roadside end stays exactly where it was poured. The earlier iteration of the same thing is Lake Providence, sitting off Beulah Church Rd and North Twelve Mile Creek Rd, platted in the late 1980s and finished through the mid 2000s on lots running one to three acres, with the low side of Lake Point Dr and the ground near the dam sitting on slow-perc clay that holds bearing water all winter, and an architectural review board that wants to see anything visible before it happens. Highgate off Providence Rd and Hemby Rd, with Highclere Dr, Grantham Pl, Wicklow Hall Dr and Blickling Dr, adds a specific detail worth naming: those estate houses pair a crawl under the main block with slab-on-grade garage wings, and the transition between them is where both the water and the differential movement show up, so a settled apron there is frequently sitting on the same backfill that is loading the crawl. Hunter Oaks off Rea Rd and Weddington Trace off Cuthbertson Rd are the tighter-lot versions of the same mechanism, with the added constraint at Weddington Trace that some lots do not have enough side yard to route a corrected discharge without crossing a neighbor or the septic reserve area.
Two. The utility-trench band, which is a well-and-septic signature. When settlement runs as a narrow strip across a drive rather than as a corner or an edge, something was trenched under there. In a town with no municipal water and no sewer in the residential districts, every house has a supply line from a wellhead to the building and a sewer line from the building to a tank, and on parcels with a shop or a barn there is a power feed and often a propane run as well. Hand-backfilled trench spoil never gets back to the density of the ground it came out of, and it keeps consolidating for years afterward. This turns up everywhere but it is most common on the acreage parcels along Beulah Church Rd, Deal Rd, Potter Rd, Antioch Church Rd, New Town Rd and Hemby Rd, and out along Will Plyler Rd and Lester Davis Rd on the Wesley Chapel side, where the drives are long, the outbuildings are numerous, and the trench count per parcel is high. The reason it matters is that a trench band can mean a leaking line, and lifting concrete over a leak is doing the work in the wrong order.
Three. Outbuilding flatwork, which is its own trade out here. Aero Plantation is the most unusual parcel pattern in the county and the clearest case: a fly-in community off Twelve Mile Creek Rd with lots starting at two acres, homes spanning 1969 to 2004 along Eagle Rd, Baron Rd and Skytop Rd, a lighted private airstrip, three fishing lakes, and a plane port, hangar or oversized outbuilding on most properties. Hangar slabs sit adjacent to the house foundations and shed straight back toward them, water sits high in the low ground beside the runway and at the north end toward the lakes, and a hangar apron that has dropped at the door stops draining and starts pushing water under the building. Mineral Springs is the equestrian version, with three-to-ten-acre tracts along Pleasant Grove Rd, Lee Massey Rd, Western Union School Rd and Billy Howey Rd carrying horse barns, riding rings and equipment buildings, where a wash rack draining the wrong way into a stall row is a real call. Unionville is the working-farm version along Morgan Mill Rd, Sikes Mill Rd and Poplin Rd, with equipment sheds and grain structures on the same parcels and long unpaved drives feeding them. Hemby Bridge along Faith Church Rd, Mill Grove Rd and Woody Grove Rd has detached shops and pole barns that are frequently the origin of the sheet flow reaching the house. On all of these, remember that a permit for a detached building goes through a county existing-system inspection first, so if a settled apron turns into a new pad, the schedule changes.
Four. Farmstead porch slabs and steps, poured on clay with nothing under them. The 1900-1950 layer along Beulah Church Rd, Twelve Mile Creek Rd, Potter Rd, Deal Rd and the older stretches of Weddington Rd, plus most of Unionville, the rural Mineral Springs parcels, plus the century-old houses on the Broome St and Main St blocks of downtown Waxhaw. These houses sit on rubble stone or hand-laid brick pier, often with no continuous perimeter, and the porch slab, the steps and the walk were poured decades later straight onto graded clay with no stone base. They ride the shrink-swell cycle every year and they pull away from the house a little more each round, and the tell is a slab that has rotated away from the building rather than simply dropped. On these I check whether the movement is the slab or the pier under the stoop, because if the pier moved, lifting the concrete is treating a symptom. Freeze-thaw does more here than the regional numbers suggest, because these are open lots with no heat island over them and the footings under an exposed porch are shallow to begin with.
Five. The 2017-and-newer builds, where the fill is still working. Off Antioch Church Rd, The Falls at Weddington takes in Boswell Way and Lakehurst Crossing, and it was put together by four separate builders across two hundred twenty-seven lots on something like two hundred eighty-seven acres, and it is the one significant piece of this town on county water and sewer, which simplifies discharge routing considerably. Behind the gate at Skyecroft, off Twelve Mile Creek Rd near Lester Davis Rd, you have north of a hundred and thirty estate houses spread across wooded lots of one to three acres, tall foundations set into deep cut-and-fill work with most of the canopy left in place. Estates at Weddington, Morris Farm, Weddington Grove and Beckingham read the same. Heavy clay fill placed fast around new foundations consolidates for years after the certificate of occupancy, so the first drive and apron settlement in these neighborhoods tends to show up between years three and eight. The right answer here is frequently deep injection into the fill wedge rather than a shallow lift that comes back, and I will tell you which one your probe readings support.
Six. Pool decks and hardscape, where several systems compete for the same clay. Providence Downs South off Marvin School Rd, gated, started in 2004 and still building, with thoroughbred street names on Aristides Dr, Smarty Jones Dr, Riva Ridge Ln, Funny Cide Dr and Venetian Way Dr, is the concentration: pools and outdoor kitchens on most lots, which means buried irrigation, pool backwash and hardscape drainage all discharging into ground that already drains slowly. Once a pool deck loses level it starts loading the coping unevenly and opening the sealant joint at the shell, which is a problem worth catching before it becomes a structural one. Marvin generally belongs here too, taking in Firethorne on New Town Rd and The Club at Longview right at the town line, where golf-course-adjacent lots take irrigation overspray against foundations and flatwork year-round. That ground was pasture, and the topsoil-to-clay interface still carries water laterally toward whatever is sitting on it.
Seven. The tight-lot ring, where the aprons are small and the access is the problem. Nowhere else in this coverage area has subdivision housing as old as Stallings does, ranches and split-levels out of the seventies and eighties lining Old Monroe Rd, Stallings Rd, Idlewild Rd and Stevens Mill Rd, with short aprons and half a century of grading that has gone flat, plus the pond and golf-adjacent sections at Emerald Lake, Shannamara and Callonwood sitting low. Parts of Stallings cross the county line, so jurisdiction gets checked before anything near the road is touched. Indian Trail is the volume-builder side, with near-identical driveways repeated across hundreds of houses in Brandon Oaks, Taylor Glenn, Bonterra Village and Crismark along Chestnut Pkwy, Stevens Mill Rd and Indian Trail Fairview Rd, small flat lots graded to the minimum so water sits against the perimeter after every storm. Lake Park is the hardest access anywhere in this area, a tightly platted neo-traditional village laid out along Trevor Simpson Dr, Mayhurst Dr, Meeting St and Courtland St, where frontages are narrow, garages load from the rear, and there is not enough side yard to route anything through. The town governs it instead of a single association covering the whole village, which means covenants have to be verified block by block. Cureton in Waxhaw, along Chasbury Park Dr, Sturminster Dr, Whitehawk Hill Rd and Carindale Rd, is genuinely pedestrian-scale with alley-loaded and zero-lot-line sections, and there one neighbor's downspout discharge really does become the next slab's subgrade problem. In all four, the lifts are smaller and the logistics take longer than the work does.
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Everything I need rides on a trailer and the polymer goes wherever the trailer goes, so coverage comes down to how far I can drive, not to what I can haul. What changes as you move around this corner of the county is who owns the pavement, which zoning desk you start at, and which creek basin the lot sheds into. Those three answers decide the job more than the mileage does.
Town of Weddington. You start at Town Hall on Weddington Rd for the zoning permit, filed through the Town's own online portal, and if soil is moving, the e-NOI and the NCG01 Certificate of Coverage have to clear first. Union County sits behind all of it for building and for environmental health. The flatwork here is long private drives, big turnarounds, detached garage and shop aprons, and porch slabs on two housing layers eighty years apart sitting on the same roads. Almost all of it sheds to Twelve Mile Creek, with the far northwestern corner going to Six Mile Creek.
Village of Marvin. Southwest along Marvin Rd, Marvin School Rd, Waxhaw Marvin Rd, Providence Rd South, Bonds Grove Church Rd, Tom Short Rd and Therrell Farms Rd, with Marvin Efird Park and the Marvin Ridge schools at the center. Same acreage and the same well-and-septic reality as Weddington. Firethorne off New Town Rd and The Club at Longview at the town line are the two gated golf communities, and golf-adjacent flatwork here takes irrigation year-round rather than only during storms, which keeps subgrade wet in months when everyone else's is drying. The older farm parcels along Bonds Grove Church Rd and Tom Short Rd still carry pier-built houses and equipment barns with the flatwork to match.
Village of Wesley Chapel. Head east and the road names become Wesley Chapel Rd, Weddington Rd, New Town Rd, Potter Rd, Cuthbertson Rd, Antioch Church Rd, Wesley Chapel Stouts Rd, Will Plyler Rd and Lester Davis Rd. One-acre zoning has been the rule here since the 1998 incorporation, and private wells and septic tanks serve nearly every address. The characteristic problem out here is the long gravel or asphalt drive that sheds straight at the house on the flatter parcels, plus shallow depressions along the drainageways holding water into spring. Ellington Downs, Wesley Landing, Hunters Point, Manor Stone and Pilgrim Forest each have an association behind them, while the working farm parcels answer to nobody.
Town of Waxhaw. South and west, and the only place in this coverage area with a genuine historic downtown. The Broome St and Main St grid is turn-of-the-century housing with walks, steps and porch slabs added long after the houses, on ground that has been regraded by street and sidewalk work more than once, which is why so much of that concrete now pitches toward the buildings. Downtown parcels are the only ones around here on municipal utilities; past Waxhaw Pkwy it goes back to well and septic. Millbridge, Lawson, Kensington, Providence Downs and Anklin Forrest along Providence Rd South, Kensington Dr, Millbridge Pkwy and Rehobeth Rd are the 2000s and 2010s subdivision side. Floodplain off Cane Creek and Twelve Mile Creek reaches into the southern and eastern edges.
Town of Stallings. Off to the northeast, built out along Old Monroe Rd, Stallings Rd, Idlewild Rd, Stevens Mill Rd, Matthews Weddington Rd and Union West Blvd, anchored by Stallings Municipal Park and Emerald Lake Golf Club. Short aprons, mature grading that has gone flat, and the low pond-adjacent sections around Emerald Lake and Shannamara. Jurisdiction here is the least predictable of anywhere I work, since the town's boundary rides the county line out at Idlewild Rd, and the right-of-way question on a street-side panel there deserves a real answer before anybody drills.
Town of Indian Trail. Farther east again, spread across Old Monroe Rd, Indian Trail Fairview Rd, Matthews-Indian Trail Rd, Chestnut Pkwy, Brandon Oaks Pkwy, Secrest Short Cut Rd and Sardis Church Rd. High-volume 1990s through 2010s growth in Brandon Oaks, Bonterra Village, Taylor Glenn, Crismark and Sun Valley Farms, with small flat lots graded to the minimum and driveway settlement that repeats house to house because the construction sequence repeated house to house. Some sections are on county sewer and some are still septic, so the parcel constraints get confirmed rather than assumed. Older farm parcels on Secrest Short Cut Rd and Sardis Church Rd are a different animal entirely.
Village of Lake Park and Town of Hemby Bridge. Lake Park packs a lot of house into a little frontage, so the slabs are modest and the real work is figuring out where to put the truck; the town rather than a single association holds the governing authority, which means covenants get confirmed one street at a time. Its neighbor Hemby Bridge is rural residential and small acreage strung along Faith Church Rd, Lawyers Rd, Mill Grove Rd and Woody Grove Rd, where detached shops and pole barns and the flatwork serving them are the common call, and the Crooked Creek bottoms on the north side keeping the water table high enough that saturated subgrade is a real spec consideration.
Town of Unionville. This is the farming end of the coverage area, up the northeast side on Unionville Church Rd, Unionville Indian Trail Rd, Morgan Mill Rd, New Salem Rd, Sikes Mill Rd, Poplin Rd, Baucom Deese Rd and Love Mill Rd, with Piedmont High School sitting on Sikes Mill Rd. Parcels here carry working barns, equipment sheds and grain structures alongside the house, reached by long unpaved drives, and cattle-worn ground sheds straight at the buildings. The Rocky River bottoms on the north side are flood-prone. Almost no covenants anywhere in town, which simplifies the work and removes any mechanism for coordinating drainage between neighbors.
Town of Mineral Springs. Down south of Waxhaw you find the biggest average lot and the thinnest density anywhere in this area, on Waxhaw Hwy, Potter Rd South, Pleasant Grove Rd, Western Union School Rd, Lee Massey Rd, McNeely Rd, Grover Rogers Rd and Billy Howey Rd, with McNeely Farms, Charlton Oaks and Sierra Chase as the platted exceptions. Horse barns, riding rings and equipment buildings on three-to-ten-acre tracts, Cane Creek drainage on the west side, and shallow depressions along Pleasant Grove Rd and Lee Massey Rd holding water through winter. Distances between houses are long enough here that power and water get planned into the job rather than assumed.
City of Monroe and the eastern towns. Monroe stands apart from every other place named here because inspections are run by the city itself, which means a job inside city limits never touches the Union County route the surrounding towns use. Its 28110 and 28112 halves stretch out toward the Unionville and Fairview countryside, with Marshville in 28103 and Wingate in 28174 continuing east along the same corridor. Monroe is also where the closest full lumber and building-supply yard sits, on Airport Rd, along with the nearest HVAC wholesale counter.
Unincorporated Union County. Plenty of the properties on my calendar sit outside every municipal boundary, and on those the county is the zoning authority in addition to being the building and environmental health authority. That is a shorter route, not an unregulated one: the water-supply watershed layers over the Twelve Mile Creek and Six Mile Creek basins and the mapped floodplain apply regardless of whose zoning desk you started at, and built-upon-area limits do not care whether you are in a town.
Over the county line. Part of 28104, plus sections of Stallings, lands in Mecklenburg County, and once you cross that line the entire route changes over to Mecklenburg zoning, Mecklenburg building and Mecklenburg environmental health. Matthews is the town on that side of the boundary. Since the postal service frequently prefers Matthews as the city name on 28104, a great many properties receiving mail addressed to Matthews are in fact Weddington land answering to Union County. That confusion turns up in parcel lookups and right-of-way questions constantly. Charlotte is up that way as well, and it is where lifting polymer and specialty material actually come from, since none of it is stocked in Monroe, which is why lead time goes in the schedule rather than in an apology later.
Wherever the address falls, the same pair of questions gets settled before I put scope on paper: who owns the ground the concrete sits on, and where is this parcel legally allowed to put the water once the slab starts draining the right direction again.
Nothing gets quoted from the seat of a truck. The visit is free, it is an evaluation rather than a pitch, and I arrive with a rotary laser and receiver, a hammer, a probe rod and a tape. The first thing I do is shoot the entire run, not just the section that prompted the call. Across three hundred feet of private drive, that means covering it end to end and chalking every drop right on the surface, so the numbers are legible to you without my having to narrate them. The panel people think is the problem is regularly not the panel that moved. What moved is usually the one that stopped draining.
Then comes the hammer. A panel with dirt beneath it answers with a dull, tight report; a panel spanning a cavity answers hollow, and the pitch of that hollow tells me roughly how deep the space runs. Next the rod goes down along the slab edges, and that is the measurement that actually decides the job. How far does it go before refusal, and does it go the same distance on both sides of the slab. On a cut-and-fill pad the difference finds the fill line in about five minutes. Along a foundation it finds the over-dig trench. Across a long drive, if there is a narrow band of drop, the probe tells me whether I am standing over a utility trench, and out here that trench is a well line, a sewer line running to the tank, a barn feed or a propane run. Which one it is changes the order of operations, because a leaking line under concrete gets repaired before anything gets lifted.
Then I walk the water, which is the step that decides whether the repair lasts. Gutters on the house, and gutters on the outbuildings, which out here is where the real omission usually is: a shop or barn roof with no gutter is a stormwater collector nobody has ever counted. Where the downspouts actually terminate versus where somebody meant them to. Grade upstream of the slab and whether builder grading from 2004 has flattened or reversed. The gravel-to-concrete transition and whether re-grading has built a stone berm damming water against the last panel. The driveway culvert at the road, because a silted culvert backs the ditch line up under the first thirty feet of your drive. And which way the parcel sheds, toward Twelve Mile Creek or Six Mile Creek, because that determines what a corrected discharge is allowed to do.
Then the parcel constraints, which nobody else on your driveway is going to bother with. I locate the wellhead, the septic tank lid, the drainfield and the mapped repair and reserve area, both because equipment does not cross any of them and because a saturated field can be the reason the soil under a slab lost bearing in the first place. I check right-of-way ownership on anything near the road. If the property is in a gated community or under an architectural review board, I sort out access and any exterior approval before we talk about a date rather than after.
Last, the disqualifiers, and I go looking for them rather than hoping they are absent. Free-floating broken pieces. Severe surface spalling. Root heave, because foam cannot push back against a growing root. A subgrade that is still actively eroding. Seasonal shrink-swell movement that is going to reverse on its own, which on a borderline case I would rather confirm by shooting the same slab twice across seasons than by lifting something the weather was going to put back. If what you have is a tear-out or a wait-and-watch instead of a lift, you hear it standing in the driveway, with the elevation readings written down in front of both of us.
You get a written number before a date goes on the calendar, and it is fixed. It is itemized by panel or by area, each line carrying its own target elevation, and any drainage correction or trench repair stands on separate lines instead of disappearing into a single lump sum. The figure you sign is the figure you pay. If something turns up during the work that no one could have seen from the surface, the equipment shuts down, I come find you, you look at it with me, and we put the change in writing before any more material goes underground. Tell me what your week looks like and I will build around it, and when I say I will be there between certain hours, I am there between those hours.
Whatever's wrong under your house — standing water, wood rot, sagging floors, fallen insulation, mold — we diagnose it on the spot and hand you a fixed-price plan the same day.
If your crawlspace floods every hard rain, a vapor barrier alone won't save you.
Mold on the joists isn't a cosmetic problem — it's a moisture problem.
If your floors sag, bounce, or slope, the fix isn't a new floor — it's what's holding it up.
Almost always lifted, not replaced. That gap at the garage transition is the single most common concrete complaint out here and it is a subgrade problem, not a concrete problem — the fill under the apron settled while the interior garage slab, which sits on the compacted house pad, held its elevation. Injecting polyurethane through quarter-inch ports lifts the apron back to its original plane and locks the void closed in fifteen minutes of cure. Replacement makes sense only when the slab itself is spidered, delaminated, or thinner than three inches, and Providence Downs South aprons are almost always four-inch pours from a real ready-mix truck. On the Providence Downs South transition lots specifically I check the downhill garage corner first because the fill depth under that corner is where the settlement always started.
You do not touch anything above the drainfield or the mapped reserve without pulling the existing-system inspection first. Union County Environmental Health at 500 N Main St Suite 47 in Monroe holds the septic records, and their inspection is required before permitting anything that alters the footprint over or next to the field. For a lift that stays outside the field envelope, polyurethane injection is safer than mudjacking because the volumes are small — an ounce or two per port — and the pressures are low. Mudjacking pushes cement slurry at ten to twelve times that volume, which will find the path of least resistance and can absolutely blow into a field line trench through the clay. On a Helena or Iredell soil pocket where the clay is already saturated, that risk goes up further, and I skip mudjacking entirely on those lots.
Not too late, but the diagnosis is different from a new settlement. Slabs that were poured level and settled later lift back to original grade cleanly. Slabs that were poured tipped — which happened often on the pre-2000 farmhouse additions along Antioch Church Rd, Beulah Church Rd, Deal Rd, and Potter Rd, where a homeowner or a small crew poured the patio without a screed line — do not have an 'original grade' to return to. Those get lifted to the elevation they should have been poured at, which is a design decision I make with the homeowner, not a mechanical one. Injection at the low edge, tapered lifts across the field, and a saw cut at the house is usually how it goes.
For a straight lift of an existing residential slab in place, generally no. Nothing structural is being added, no new load path is introduced, and restoring a slab to its original elevation is not an activity the code governs. Where a permit shows up is when the scope grows past the concrete. Regrading, swale cutting, or a discharge trench counts as land-disturbing work, and the Town of Weddington wants an electronic Notice of Intent and an NCG01 Certificate of Coverage before it will issue the Zoning Permit, at Town Hall on 1924 Weddington Rd. Anything structural — a stoop foundation, a porch pier, a retaining wall — becomes a Union County building permit through Building Code Enforcement at 500 N Main St in Monroe. Work touching the septic system routes to Environmental Health, same building, Suite 47.
The lift fixes the concrete. It does not fix why the concrete sank, and that distinction matters here. The downspout is eroding the fill under the slab, and unless the downspout is extended past the slab or piped underground to daylight, the void will re-open in a season or two and the slab will drop again. On Highgate lots the fill under the perimeter walkways is builder-provided clay-loam over Cecil or Appling, and it moves the moment concentrated water hits it. I lift the slab, seal the joints, and then run a four-inch corrugated extension from the downspout past the slab edge to a splash block on grade. Neither piece is worth doing without the other.
Yes, and garages are actually easier than exteriors because there is no rain load and the subgrade is drier. On the Lake Forest Preserve stock the garage floors are typically four-inch monolithic pours on compacted fill inside a stem wall, and where the fill was placed in one lift instead of six-inch lifts it settled once the house loaded up. Injection ports go through quarter-inch holes in the low corner, HMI TerraThane 24024 or PolyLevel PL-400 goes in, and the slab climbs back to plane over about ten minutes per station. The holes get patched with color-matched grout the same day. Cars go back on it that afternoon.
Practically, three inches on a residential slab before the geometry of the void starts arguing with the geometry of the slab. Past three inches the slab is not settled anymore — it is broken and separated, and lifting the far edge is going to load the crack line harder than the concrete wants. I have taken driveways up two inches at the low corner and had the whole apron close its gaps at the house. Beyond that I am usually recommending selective removal and a re-pour of the failed panel rather than fighting the physics. On the older brick-pier farmhouses on New Town Rd and Hemby Rd, the porch slabs are often past that threshold because they were poured against an unstepped footing and dropped as a unit.
Yes, but I inspect the void first. Older mudjack slurry cures to a weak cementitious mass that settles again when the underlying clay moves, and on Weddington's shrink-swell soil that clay is going to move on a five-to-seven-year drought-wet cycle. Polyurethane goes on top of, or through, the old material without any issue — the resin flows through voids the slurry did not fill and locks the whole assembly against the underside of the slab. Where I hesitate is if the old mudjack turned into a heavy monolith that is now the reason the slab is tipping. In that case a section may need to come out.
Yes, with slower pump rates and smaller ports. Coping is set in thinset over the bond beam and it will separate before the deck slab does if you push a lift too fast. On the pool decks around The Falls at Weddington and the Estates at Weddington I typically use eighth-inch ports spaced tighter than a driveway job, run the pump at low pressure, and lift in half-inch increments across the deck rather than pushing a single corner up. The coping either comes up with the deck or, on a bad bond, stays put while the deck rises under it. Either outcome is fixable, but the slower approach costs almost nothing and prevents the coping repair.
Yes, but the discussion is different. Anything downslope of Twelve Mile Creek Rd or North Twelve Mile Creek Rd gets a floodplain check against the Union County GIS layer before I quote, because a slab sitting in the 100-year floodplain is going to see hydrostatic pressure again and the lift material has to tolerate saturation. Polyurethane is closed-cell and hydrophobic, so it does not lose strength under water the way cement slurry does, which makes it the right chemistry for these lots. What the lift will not do is stop the flood — if the slab sank because Twelve Mile Creek came up over it, it will sink again the next time the creek comes up. On those lots I am honest about that and I recommend regrading around the slab as part of the same visit.
For a straight lift, usually not. Nothing structural is added, no load is added, and the footprint does not change, so restoring a slab to the height it started at sits outside the Union County building permit process. What can cross that line is (a) exterior grading — cutting a swale, running a french drain, or reshaping a slope — which is land-disturbing work and triggers a Notice of Intent and a Certificate of Coverage under NCG01 before the Town releases the zoning permit, and (b) rebuilding a porch, stoop or pier that turns out to be structural, which is a Union County Building Code Enforcement permit and inspection. I tell you at the assessment which category your job is in.
Usually yes, but the plan changes. Rig weight does not cross a drainfield or the mapped repair and reserve area under any circumstances — one loaded pass can end a system permanently. I pull the septic permit, locate the tank, the field and the reserve on the ground, and if the only equipment route would cross any of them we work around it with additional hose and a longer set-up. That is a slower day rather than a stopped job, and on a Weddington parcel where nearly every driveway lives beside a permitted system, it is routine.
A band that runs clean across a driveway is not consolidation and it is not shrink-swell — those show up as broad dips or as edge drops. A band is a trench. Out here the candidates are short: a well line running from the wellhead to the house, a sewer line running from the house to the septic tank, an electrical feed to a barn or shop, or a propane run. Every one of those was cut through undisturbed clay, sleeved, and backfilled by hand rather than compacted in lifts. Sometimes the line under it is also weeping, which means lifting the concrete first would be the wrong order of operations, and I would rather find that on the probe than after the lift.
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