Home › Services
Repair, lift or replace a failing slab
Not every cracked driveway needs to be torn out, and not every patch is a bargain. The right fix depends on why the concrete failed, whether the cause is still active, and how much of the slab is affected. Around Augusta, the usual causes are sand washing out from under edges, clay moving with wet and dry seasons, loose fill beside foundations, tree roots, and slabs that were built without enough base, joints or slope. This page explains how to read the damage in front of you and how to judge the repair or replacement plan a contractor proposes.
Read the cracks before choosing a fix
Crack patterns carry information. A few straight, hairline cracks running between control joints are usually shrinkage and often cosmetic. A crack that has one side higher than the other means the slab has settled or heaved unevenly, and the ground is the story. Wide cracks that keep growing over a season suggest that whatever caused them is still at work.
Diagonal cracks cutting off a corner often point to missing support under that corner, from washout or poorly compacted fill. A spiderweb of cracks in one area can indicate a heavy point load or a soft spot. Cracks radiating from a column, drain or step can mean an isolation joint was never included. Taking photos over a few months, with a coin or ruler for scale, gives a contractor useful evidence of movement.
Surface damage versus structural failure
Some damage lives only at the surface. Flaking, rough patches and exposed stones, called scaling or spalling, can come from finishing problems, water attacking a weak top layer, or occasional freeze-thaw cycles on a slab that was never sealed. When the slab beneath is still solid and level, a resurfacing product or careful repair may be enough.
Structural failure is different. When a slab is broken into many pieces, has sections that rock underfoot, has dropped several inches, or has a void you can see beneath an edge, the problem goes through the whole thickness and usually starts in the ground. Resurfacing a slab in that condition only covers the symptoms for a while.
Lifting a sunken slab
A panel that dropped without breaking apart is often a good candidate for lifting. Slabjacking, sometimes called mudjacking, pumps a cement-based grout through small holes to fill the space beneath and lift the concrete. Polyurethane foam lifting does the same with an expanding foam, using smaller holes and lighter material. Both work best on slabs that settled because the ground beneath compressed and has since stopped moving.
Lifting is a poor fit when the concrete is badly broken, when water is still washing sand out from underneath, or when the slab has heaved upward rather than sunk. In sandy parts of the region, it is worth asking what will stop the washout from returning, such as redirecting a downspout or sealing a joint, because filling a void without fixing the water source often means the void comes back.
When tearing out is the honest answer
Full replacement makes sense when the damage is widespread, when the original slab was too thin or built without a proper base, or when drainage needs to be corrected in a way that requires the concrete to come out. It also makes sense when several panels are failing and lifting or patching would cost almost as much as starting over without addressing the cause.
Replacement gives the chance to fix what went wrong. That may mean removing soft soil, adding a deeper compacted stone base, reshaping the ground so water runs away, redesigning the joint layout, or thickening the slab for the loads it really carries. A replacement quote that simply promises new concrete in the same footprint without addressing why the old one failed may lead to the same result.
Partial replacement and matching
Sometimes only one or two panels need to come out, for example a section near the garage door that sank over loose fill. Cutting out a panel at existing joints and pouring a new one is a common approach. Dowels drilled into the neighboring slab can help keep the new panel level with the old.
Color is the usual trade-off. New concrete rarely matches old concrete exactly, because the old surface has weathered and collected stains. The difference fades somewhat with time, but it seldom disappears entirely. If appearance matters, discuss whether replacing a larger, well-defined area would look better than scattered patches.
Demolition, haul-off and the site afterward
Removing old concrete is heavy, noisy work. The slab is broken up, loaded and hauled away, and the quote should say where it goes. Nearby landscaping, irrigation lines, fences and the lawn can suffer during removal, so ask what protection is planned and how the edges of the yard will be restored after the pour.
Tear-outs also uncover surprises. Old slabs sometimes turn out to be thinner than expected, poured directly on topsoil, or sitting over buried debris. A fair contract explains how the contractor will handle unexpected conditions and how you will be consulted before any change in scope.
Timing a repair around Augusta weather
Damage that is slowly getting worse rarely needs an emergency response, which gives you room to plan. Spring and fall bring the most forgiving temperatures for fresh concrete, while midsummer pours usually start at first light to stay ahead of the heat. Lifting work and crack sealing depend more on dry conditions than on temperature, so a stretch without storms matters most for those.
A trip hazard at the front door is the exception. If a stoop or walk panel has a raised edge that people catch their feet on, mark it clearly or ask about a temporary fix while the permanent repair is scheduled.
Comparing repair and replacement proposals
- What does the contractor think caused the damage, and is that cause still active?
- Is the recommended fix a patch, a lift, partial replacement or full replacement, and why?
- For replacement, what base, thickness, joints and drainage changes are included?
- How will removal and haul-off be handled, and what happens to the site?
- How will new concrete be tied into any slabs that stay?
- What should you expect in appearance where old and new concrete meet?
Repair, lift or replace a failing slab — common questions
Should I fill cracks in my driveway myself?
Sealing narrow, stable cracks with a flexible filler designed for concrete can keep water from getting into the base, which is helpful, especially on sandy lots where water washes material away. It will not fix a slab that is settling or heaving. If a crack is widening, one side is higher than the other, or panels move underfoot, have a contractor look before sealing it over.
Is foam lifting better than mudjacking?
Each has trade-offs. Foam uses smaller holes, is lighter, and cures quickly, while cement-based slabjacking uses a heavier material that some contractors prefer for filling large voids. Neither is right for every slab. The more important questions are whether the slab is intact enough to lift, whether the ground has stopped moving and whether the water source that caused the settling has been fixed.
Why do my patio panels rock when I step on them?
A panel that moves underfoot usually has lost support underneath, often because water has washed out sand or fine soil, or because fill beneath has compressed. Rocking panels are a trip hazard and tend to crack further as they flex. A contractor can check the size of the void and decide whether lifting and filling underneath is practical or whether the panel should be replaced.
Can new concrete be matched to my old driveway?
An exact match is unlikely. Old concrete has been weathered, stained and worn by traffic, while new concrete starts out lighter and more uniform. The difference usually softens over time. For a patch in a prominent place, some homeowners choose to replace a larger area or a whole section between joints so the new work reads as a deliberate panel rather than a spot repair.
How do I know if a replacement quote fixes the real problem?
Ask the contractor to explain why the old slab failed and how the new work will prevent the same thing. A good answer names specific steps: removing soft soil, adding and compacting stone, redirecting water, correcting joint spacing or thickening the slab. If the proposal is simply to pour new concrete in the same way, the same failure is likely to follow in time.
Is it worth repairing an old slab before selling a house?
It depends on the damage and the market. Obvious trip hazards, sunken stoops and cracks with raised edges tend to show up in inspections and can concern buyers. Surface staining or minor hairline cracks usually matter less. A contractor can tell you which issues are safety or structural concerns and which are cosmetic, so you can focus spending where it makes a difference.
Talk through your project
Start with the address, what you want poured or replaced, rough dimensions, and a few photos of the area and any existing concrete.
Related work
Concrete Driveways
New drives, widenings and tear-outs built for clay or sandy lots.
Concrete Patios
Back patios pitched to shed summer downpours away from the house.
Stamped & Decorative Concrete
Patterned, colored and aggregate finishes, and sealers for humid weather.
Walkways & Steps
Front walks, stoops and steps with even risers and room for tree roots.
Garage, Shed & RV Slabs
Garage, shop, boat and camper pads matched to their heaviest load.