Walk out to the retaining wall after a storm and the signs are hard to miss: the top course doesn't line up with the fence anymore, or there's a belly in the middle of the run, or a hairline gap you noticed last spring is now wide enough to put a finger in.
Here's the part worth sitting with first. That wall is holding back tons of soil, and soaked soil weighs far more than dry soil. It doesn't fail all at once. It gives a little, then a little more, and the way it gives tells you what's wrong.
A retaining wall that leans at the top is tilting as one piece. One that bulges in the middle is coming apart inside. One that slides or drops at the base has lost its footing. Each of those points somewhere different, and a wall that is still standing can often be anchored back rather than rebuilt.
Three ways a wall moves, and they are not the same problem
Before anything else, stand at one end and sight down the length of the wall like you're checking a board for straightness. What you see in that first ten seconds narrows it down more than anything else you can do.
The top leans out and the base stays put
The wall is tipping away from the slope as a single unit, hinging somewhere down low. The owner's description is exact: a wall like this "is tilting as one big unit, because they didn't use the right size block with the tie-backs into the soil and properly poured." Nothing came apart. The wall is simply being pushed over by what's behind it, and it's winning nothing.
The middle pushes out and the top and bottom stay in line
A belly rather than a tilt. Here the wall is losing its fight internally, which is a different failure from tipping, and it usually shows up with a crack running sideways through the joint at the widest part of the curve.
The base slides, or a section drops below its neighbors
If part of the run has sunk relative to the rest, or the bottom course has shifted out along the ground, you're looking at what's under the wall rather than what's behind it. That one changes the repair. In the owner's words: "If it's the footing rolling, and it dropped, you got to put the piers in."
A wall can do two of these at once. Note which one is worst and where along the run it's worst, because that spot is where anything gets fixed first. On the crews here the rule is simple: "usually we'll put our anchor wherever the crack starts."
The yard above the wall is the other half of the story
Most people study the face of the wall and never look at the ground it's holding. That ground moves first, and it moves visibly.
Walk the top of the slope and look for a crack or a low seam in the turf running parallel to the wall a few feet back from the edge. That's the soil behind the wall starting to travel with it. Look for a patio, a walk or a fence post line near the top edge that's gone out of true in the same direction as the wall. Look for mulch or soil spilling over the cap, or a gap opening up behind the top course where the dirt has pulled away.
Those signs matter because they date the movement. A wall that leans with a perfectly intact lawn behind it has probably leaned for a long time. A wall that leans with a fresh seam in the grass behind it is moving now.
Grades that were changed to make the lot work
A lot of these walls exist because somebody had to make a sloped lot buildable. As the owner puts it, "a lot of them are built, because they changed the grade." Around metro Atlanta that's the norm rather than the exception. The soil survey maps large stretches of Marietta, Decatur and Brookhaven as 10 to 25 percent slope units, and it maps the built-up areas as "Urban land" complexes, which is the survey's way of saying the ground was graded, cut and filled before anyone built on it. A wall set into fill has less to lean on than a wall set into undisturbed ground.
The red clay explanation doesn't fit here
You will read constantly that Georgia red clay swells up and shoves retaining walls over. The USDA rates the soils under most of metro Atlanta as low for shrinking and swelling, so that explanation doesn't hold here. The honest drivers are water, slope, fill and erosion, and they explain what you're seeing better anyway.
What the drainage back there is actually telling you
You can't see behind your wall, but you can read what comes out of it.
Look along the bottom for weep holes, small openings set roughly six inches up from the base, spaced along the run. Their whole purpose is to let water leave. If you can't find any, or the ones there are plugged with soil and moss, water that gets behind the wall has nowhere to go but up.
Then watch the wall during a long rain. Water running out of the weep holes is the system working. Water running over the top of the wall, or soil and mud coming with it, means the ground behind is saturated and shedding rather than draining.
Your French drain is probably not the thing that failed
This one comes up on nearly every call, and the answer usually surprises people. The owner: "when people say, hey, my French drain has collapsed on my retainer wall, a French drain, you can collapse a foot of it, and it still works beyond it. It'd just go around the collapse or over back to the gravel. It's nothing more than a PVC pipe with perforations wrapped in gravel or a sock."
So a crushed foot of pipe is rarely the culprit. Two or three days of hard rain landing on a slope is a volume problem, not a broken-part problem. Worth saying plainly: moving water away from a wall is drainage work, and drainage is its own trade and its own hire. Anglin's doesn't do it. What Anglin's does is deal with the wall the water has already moved.
Is it the wall, or only the face of it?
Here's the check that saves people the most money, and almost nobody makes it.
Plenty of walls around here are a structural concrete or block wall with brick or stone laid on the front of it. When the facing pulls off, the whole thing looks like it's coming apart, and it usually isn't. The owner sees it constantly: "Sometimes it's not even the retaining wall. They may have a poured concrete wall that's perfectly fine, that's holding the earth, but the veneer on the front, stone or brick, and if it pulls, they think their whole retaining wall is pulling."
How to tell from the yard. If the top line of the wall is still straight and level while the brick or stone bulges away below it, that's a facing that has let go of a sound wall behind. If the whole cap has gone out of line with everything around it, the wall itself moved. Get a look behind a loose stone if you can, and see whether there's solid concrete or block sitting there untouched.
The two cases get repaired differently and they don't cost the same, which is exactly why this gets identified before anything is quoted.
Height, engineers and what the permit offices require
This is the piece of the conversation homeowners rarely see coming, and it's better to know it now than the week you're trying to schedule work.
Several metro jurisdictions treat four feet as the line where a retaining wall stops being landscaping and starts being a structure. Peachtree City is the strictest of the ones we checked: the city states that a permit and an engineer's design are required for any retaining wall four feet or more measured from the top of the footing, that the plans must be sealed and signed by a professional engineer licensed in Georgia, and that the wall be built under the supervision of a registered Georgia engineer. Its guidance on damage goes further, pointing owners to a letter from the wall's design engineer laying out the proper repair procedure.
Cartersville publishes the same four-foot threshold measured from the bottom of the footing, with an engineer-stamped cross section at permit and an engineer's letter at completion. Brookhaven takes it the other direction and requires a permit even for repairing a wall under four feet, filed as minor site work. In unincorporated Fulton County, walls over four feet need a permit, with owner certification between four and six feet and engineer certification above six. The City of Atlanta lists retaining walls on its residential permit menu, though the published height trigger inside city limits isn't something we could confirm.
Two things to be clear about, because they affect how you plan. Anglin's does not pull permits, and Anglin's does not supply an engineer. If your wall falls under one of these rules, the permit and any engineering are yours to arrange with your city or county. Call the building department at your address and ask about the threshold before you schedule anything.
What the crews do bring is the practical side of it. Engineers call here too. As the owner tells it: "the engineers call us, they're like, hey, Scott, this is scratching my head here, what are we gonna do? And we'll sit there, we'll talk about it, it can't be done, or it can be done, this is how we do it."
When a wall can be tied back, and when it can't
The honest version is short. A wall that's still standing, still one connected structure, and still holding its soil is usually a candidate for anchoring. A wall that has already come apart, shed courses or dropped its load into the yard is a rebuild, and a rebuild is new construction rather than repair.
For everything in between, the choice is blunt. The owner: "The only way to do it is tear it down or plate it with those tie-backs."
Anchoring means going out into the good soil well behind the wall, setting steel there, and running the connection through to a plate on the face, so the wall is held by ground that isn't moving.
The hardware has a name that throws people off. They're called seawall anchors, or tieback anchors, because the system was developed to hold seawalls against water pressure. The same anchors hold a retaining wall against soil pressure, which is the same problem with a different medium. Anglin's doesn't work on seawalls. They use the anchors, and that's where the name comes from.
It's the same idea behind a boat's anchor, which is roughly how one customer described their own job:
"Anglin foundation has provided outstanding service to my home for over 30 years of homeownership. ... Most recently they have stabilized a moving stacked stone patio wall using sea anchor technology, and welded steel rods and plates."
Mark Kupelian, 5 stars
The practical takeaway is about timing rather than urgency. Every season a wall leans further, the anchoring gets bigger and the window for saving it narrows. Walls don't recover on their own, and none of them go backward.
Four things to do before anyone comes out
None of these cost anything, and all four are worth having in hand:
- Sight down the wall from one end and note whether the movement is a tilt, a belly or a drop, and roughly where along the run it's worst.
- Hold a level against the face at the leaning spot and note how far off plumb it sits, then write the date on the wall in pencil so you can check it again.
- Walk the ground above it and look for a seam in the turf, a tilted fence line or soil pulling away behind the cap.
- Watch it during the next hard rain and see whether water leaves through the weep holes, over the top, or not at all.
If the lean hasn't changed in a couple of months and the ground above it is undisturbed, that's genuinely useful information, and it's information you gathered yourself.
Frequently asked questions about a failing retaining wall
How much lean is too much?
There's no single number that fits every wall, because a two-inch tilt on a three-foot garden wall and a two-inch tilt on a ten-foot wall holding a driveway are different situations. What matters more is whether the lean is changing. Mark it, date it, and check it in a few months, and if it has moved in that time, treat it as active regardless of how far over it currently sits.
Do I need a permit to repair a retaining wall?
That depends entirely on your city or county and usually on the height of the wall, with four feet being a common threshold and some jurisdictions requiring a permit even below it. Anglin's does not pull permits and does not provide engineering, so the permit and any engineer's involvement are arranged by you with your local building department. Call them with your address before you schedule work.
Can a leaning retaining wall pull my house with it?
Usually not, if the wall sits well out in the yard and nothing structural rests on the ground it holds. It becomes a different conversation when the soil behind the wall also supports a driveway, a patio slab, a deck footing or the house itself, because then the wall is carrying a load beyond its own soil. Where the wall sits in relation to the house is one of the first things looked at on a visit.
My wall is bulging in one spot rather than leaning. Is that different?
Yes, and it's worth describing accurately when you call. A tilt says the wall is being pushed over as a unit. A bulge says the wall is failing internally at that point while the rest of it holds, which tends to show up as a crack through the joint at the widest part of the curve. The two get approached differently.
Can I straighten a leaning retaining wall myself?
The forums are full of people trying, and the reason it rarely works is that the soil is not the part that gives. Digging out the face, resetting courses or bracing from the downhill side does nothing about the weight sitting behind the wall, which is still there the next time it rains. Anything that holds long-term has to reach past that soil to ground that isn't moving.
What about a railroad tie or timber wall?
Timber and railroad tie walls fail on a schedule of their own, because the wood eventually rots at the ground line and the tiebacks rot with it. They're worth knowing about because they can look sound from the face while the buried portion is gone. Railroad tie walls fall outside the repairs Anglin's takes on, so a wall like that needs a different call.
Find out which kind of movement yours is
You don't have to decide from your driveway whether that wall is a repair or a rebuild, and you shouldn't have to pay to find out. Someone can come sight the wall, look at the ground above it, tell you whether it's the wall or only its face, and say plainly whether it can be anchored where it stands.
Anglin's has been doing this in metro Atlanta since 1930.
If the wall can be anchored back rather than rebuilt, retaining wall repair covers how that works. If the footing under it has moved, signs of foundation problems is worth a read too.
Call 770-422-2924 for a free look.