Concrete Sidewalk Repair for Root-Lifted and Broken Panels

Ask Gerardo what breaks sidewalks around here and the answer is short: mainly roots. Sidewalks run close to trees, they are lighter than driveways, and a growing root under one panel will tip it up until the joint becomes a ledge. The panels on either side are often in fine shape.

You can usually read the cause from the break. A panel tipped up along one edge, with a tree a few steps away, is a root. A panel cracked through the middle where the walk crosses the driveway is often weight. A walk that is crumbling and cracked along its whole length is old concrete at the end of its life, and that is a different conversation than a one-panel repair.

That is why most sidewalk calls are for one or two sections, not the whole walk. If the rest of the sidewalk is sound, Gerardo will say so and quote only the panels that need to come out.

A lifted panel is more than an eyesore. The raised edge sits right where people walk without looking down: guests arriving after dark, kids on bikes, a neighbor pushing a stroller, a parent coming up to the door with groceries. Roots keep growing, so the lip tends to get taller, not shorter. Signs a section needs replacing now:

• One edge sits noticeably higher than the panel next to it.
• A panel rocks or shifts when you step on it.
• Pieces have broken loose at a crack or a corner.
• Water stands on the walk, or runs under a broken edge, after rain.

Concrete sidewalk crack repair has its place. A tight crack that stays flat can be sealed to keep water out, and that is a reasonable step for a crack that isn't moving.

A patch can't fix a panel that has lifted, sunk or broken into pieces. Grinding the lip down or troweling a ramp of patching material onto the edge leaves the root, the tilt and the loose base exactly where they were, and the patch tends to break away as the panel keeps moving. We replace sections; we don't caulk and hope. We also don't lift or level slabs. When a panel is out of line, it comes out and a new one goes in.

Sidewalk replacement starts with clean saw cuts, so the new panel meets old concrete along a straight edge. The broken section comes out and gets hauled away, and then we can see the root that did the damage. That root is the reason the panel failed, so it has to be handled before anything is poured. If the tree matters to you, an arborist can tell you which roots can be cut safely.

With the root dealt with, the base is filled, compacted and graded, the new panel is formed to sit flush with its neighbors, and the surface gets a broom finish for grip. A fresh panel will be a lighter shade than the old walk for a while. You will see where the repair is, but you won't feel it underfoot.

Some companies raise a settled panel back to level by pumping foam or grout underneath it. That can work when the panel is still in one piece and has only sunk. We don't lift panels. We cut out the panels that are broken, pushed up by a root or sunk over washed-out ground, fix the base under them, and pour new ones that tie into the walk around them.

If a panel is cracked through, lifted by a root, or sitting over a void, replacing it is the lasting fix, and that is the work Gerardo quotes. If your panel is sound and only a little low, he will tell you that too.

Roots are the main cause, but the ground helps them along. USDA NRCS soil data flags shrink-swell as a limitation for slab homes on roughly 4 in 10 acres in both East Baton Rouge and Livingston parishes. Soil like that swells when it is wet and shrinks when it dries, and Louisiana averages about 60 inches of rain a year, so it does both often.

A sidewalk is thin and light compared with a house slab or a driveway, so it moves with the ground more readily. That is one more reason we spend time on the base under a replacement panel: the new section should rest on even, compacted support, not on whatever was left under the broken one.

Roots aren't the only cause. A home renovation brings dumpsters, material deliveries and work trucks across walks that were built for people. Concrete walkway repair after a remodel is common: panels crack where a wheel rolled over an edge or where a heavy load sat for weeks.

If a renovation is still underway, it makes sense to wait until the heavy deliveries are done before replacing damaged panels, so the new concrete isn't the next thing a truck runs over. Once poured, new sections need a full day before foot traffic and 5 to 7 days before anything heavy rolls across them.

If the remodel crew or a delivery truck damaged the walk, take photos before anything is cleaned up. It helps whatever conversation you have with the people who did it, and it shows us exactly how the panels broke.

Not every sidewalk in front of your house is clearly yours to fix. Who repairs the public sidewalk along the street, the homeowner or the local government, varies by place, and we have not confirmed the rule for any city or parish we serve. Before you hire anyone for a street-side sidewalk, call your city or parish and ask who is responsible and whether a permit is needed.

In East Baton Rouge Parish, start with the City-Parish permits and inspections office. Inside the City of St. George, which issues its own permits, call the St. George building department. In Livingston Parish, check with Denham Springs, Walker or the parish, depending on where you live. Walks on your own lot, from the driveway to the door or along the side of the house, don't raise that question.

A sidewalk repair is small enough that it is easy to hire the first person who answers the phone. A few questions sort out who is going to fix the problem and who is going to cover it up:

Sidewalk repair is often a small job, and small jobs still carry setup, saw-cutting, removal and haul-off. What changes the estimate is how many panels come out, how big the root is and where it runs, whether the base needs rebuilding, access, and whether several repairs, such as a sidewalk panel and a cracked driveway corner, can be handled in one visit. Gerardo walks the sidewalk and sends a written estimate with each section listed, so you know exactly what you are paying for. Planning a walkway where there is none yet? See new sidewalk construction.

• Which panels are you replacing, and which ones are fine?
• What will you do about the root under the lifted panel?
• How will you prepare the base before the new concrete goes in?
• Will the new panel sit flush with the ones beside it?
• Who hauls the broken concrete away, and what does the walk look like when you leave?