A stump next to a driveway or sidewalk can be ground without harming the pavement when the machine is set up off the edge or on mats and the wheel stays out from under the slab. Grinding removes the stump and the roots close to it, but it will not flatten a section that roots have already lifted; that part is a concrete or asphalt repair.
How roots end up under pavement
Iowa State University Extension explains that tree roots looking for water and nutrients spread sideways near the surface, and roots that meet a sidewalk keep growing beneath it. As they thicken, they press up on the slab and cause lifting, cracking and sections shifting out of line. University of Florida research adds a twist: cracks seem to invite roots as much as roots cause cracks, and some sidewalks with roots under them do not crack until a vehicle drives on them. Either way, by the time a tree beside a drive comes down, there is often a root or two under the edge.
Protecting the drive while the machine works
Where possible the grinder sets up on the lawn side of the stump, so the pavement is only crossed, not worked on. When it has to sit on the drive, matting and placement handle that. Asphalt edges are the soft spot: an unsupported edge crumbles under a concentrated load in a way the middle of the drive does not, so the machine stays back from it. The photo at the top shows a tracked grinder parked on an asphalt drive beside a cut stump. Concrete is stronger, but the wheel must never touch it, which is why the cut stops at the slab edge.
What happens at the edge of the slab
During stump grinding, the wheel works the stump down below grade and follows the root flare out to the pavement, then stops. Roots that run under the slab are cut where they leave the stump and stay under the concrete, where they die and slowly rot. Most of the time nothing more happens. Where a big root ran under a thin walk, the soil can settle a little as it rots, the same way a stump hole sinks in a lawn. If a section is already lifted, leave it for now and fix it once the stump is gone.
Lifted sections: what actually fixes them
Iowa State Extension lists the usual repairs. Grinding the raised edge of the concrete down to meet the lower section removes the trip hazard but thins the slab, and with a living tree it is only temporary. A wedge patch can ramp the low side up. Rebuilding the section is the permanent answer. With the tree gone and the stump ground, roots stop growing, so a replaced section has nothing pushing on it. Drives, walks and aprons are part of concrete work, so the stump and the slab can be planned together.
Whose sidewalk is it?
The strip between the curb and the sidewalk, and the sidewalk itself, often sit in the public right-of-way rather than on your lot, even though you mow them. Inside a town, the public works office or the town's tree rules decide what can be done there, and some towns treat trees in that strip as public trees. Along a state road, the right-of-way belongs to the state: in South Carolina, SCDOT requires an encroachment permit for work within its rights-of-way, and in North Carolina the NCDOT county maintenance office is the place to ask. Check before booking. Never assume the strip is yours.
Lines along the drive
Driveways are where services tend to run. The water line from the meter, the gas service, phone and cable often follow the drive up to the house, and a lamp post or mailbox light may have a cable buried beside the edge. Public lines are located through 811 before grinding near them. Private lines, including the run from the meter to the house, are yours to point out. A stump by the street is also the most likely place for a meter box or a cleanout hidden in the grass, so look before the machine does.
Building or widening a drive
If the drive is going to be widened or a new apron poured where the stump stands, grinding is the wrong job. Grindings and rotting roots under new pavement settle, and the slab follows them down. That is when full stump removal makes sense: an excavator or loader lifts the whole stump and its roots, the cavity gets filled and compacted, and the base is built on firm ground. Our guide to clearing stumps for a new driveway covers that case in detail.
Common Questions
Will a stump grinder crack my asphalt driveway?
Not when it is set up properly. The machine works from the lawn side where it can, crosses the drive on mats when it must, and stays back from the unsupported edge, which is where asphalt breaks. The wheel never touches the pavement. Point out any soft or cracked areas beforehand.
Do roots under my sidewalk keep growing after the stump is ground?
No. Once the tree is dead and the stump ground below grade, roots stop growing, though a few species such as poplar and locust can sucker. Roots already under the slab are left to rot slowly. A lifted section stays lifted until it is repaired or replaced.
Who is responsible for a stump between the sidewalk and the street?
It depends on where the right-of-way line falls. That strip is often public land maintained by the town, and on state roads it belongs to NCDOT or SCDOT. Ask the town public works office or the state's county maintenance office before any work there.
What to Do Next
Take one picture of the stump with a tape laid over it and one along the edge of the drive or walk, then pass them on with the name of your town, or phone (828) 574-4474. A cracked slab can be priced in the same quote.