Retaining Wall Installation in Sandy Springs, GA

A retaining wall holds back soil where your yard drops away. It only works if water can get out from behind it. We build walls for Sandy Springs homes, from low garden terraces to taller walls along driveways, and we start with a site visit and a written estimate before any digging begins.

When a retaining wall makes sense

A retaining wall holds soil back where the ground changes height faster than it can hold itself. On a flat lot you rarely need one. In Sandy Springs, many homes sit on slopes that run down toward creeks and the river, so walls are common here. Most people call us for one of these reasons:

• A bank behind the house sends mud onto the patio or against the foundation after heavy rain.
• You want a flat area on a hillside yard for a lawn, a play space or a vegetable garden.
• A driveway or walkway cuts into a bank that keeps slumping onto it.
• An old wall is too far gone to patch and needs replacing.

What makes a wall last

When a retaining wall fails, the cause is rarely weak blocks or stones. The usual cause is water. Wet soil is heavy, and saturated clay pushes much harder than dry clay. If water has nowhere to go, the pressure behind the wall builds with every storm until the wall leans, bulges or cracks.

A properly built wall handles that pressure with parts you will never see once the job is done:

• A compacted gravel base under the first course, so the wall sits on something firm and level.
• Clean drainage stone behind the wall in place of the clay that came out of the trench.
• A perforated drain pipe at the bottom of that stone, sloped to carry water out to daylight or another suitable outlet.
• Filter fabric where needed, so fine soil does not clog the drainage stone over time.
• A slight backward lean built into the face, called batter.
• On taller walls, layers of reinforcement grid laid back into the soil as the design calls for.

Sandy Springs soil, slopes and rain

Much of the ground in Sandy Springs is the red clay found across the Georgia Piedmont. When it is dry it is firm and holds a cut bank well, so a slope can look more stable than it really is. Once it is soaked, it turns slick and heavy and drains slowly. Summer thunderstorms here can drop a lot of rain in a short time, and that is usually when weak walls and bare banks give way.

Lots across the city vary a great deal. Some older homes are built into hillsides, with long sloping backyards and driveways cut into the grade. Newer houses often sit on tighter lots, where a wall runs close to a property line or a neighbor's fence. Near creeks the ground can stay wet for long stretches, and in some yards you hit rock a short way down, which changes how deep we can dig and how the base is set.

On the first visit we look at where the water comes from and where it can go, what the soil looks like in a test cut, and what will sit above the wall. A wall holding back a lawn carries a very different load from one holding up a driveway, a patio or a pool deck.

Choosing a wall material

We build three kinds of new walls. The right choice depends on height, the look you want and how long you expect the wall to last.

• Block retaining walls: interlocking concrete units with a consistent shape. They suit taller and engineered walls, handle curves and built-in steps well, and give clean, even lines.
• Boulder retaining walls: large natural stones set in place with equipment. They fit wooded lots and informal gardens. Boulders are very heavy, so we need room to get machines to the work area.
• Timber retaining walls: often used for low garden beds and terraces. Wood eventually rots in damp clay, so a timber wall will not last as long as block or stone.

Height, permits and engineering

Low garden walls are fairly simple to build well. As a wall gets taller, the force on it grows quickly and the margin for error shrinks. Taller walls, and walls that support a driveway, a building or a steep slope above them, usually need a design from an engineer.

Cities set rules for wall height, setbacks and permits, and Sandy Springs is no exception. Before we start, we check the current requirements for your project with the city. If your wall needs an engineered design, we will tell you at the estimate stage, not halfway through the job. We also have underground utilities marked through Georgia 811 before anyone digs. If you live in a neighborhood with an HOA, check whether they need to approve the material or color first.

What an installation involves

Here is how a typical job runs from start to finish:

• Site visit: we walk the slope with you, look at drainage, measure the length and height, and ask how you want to use the space.
• Written estimate: it lists the material, the drainage, the wall dimensions, and what happens to the soil we dig out.
• Preparation: utility marking, any permits, and a plan for getting equipment into the yard.
• Excavation and base: we dig the trench, compact the gravel base and set the first course level. Getting this course right matters more than any other step.
• Building up: we lay each course, run the drain pipe, place drainage stone and compact the backfill in layers, adding grid where the design calls for it.
• Finishing: we set caps, grade the ground so surface water runs away from the wall, and clean up.

Building new or repairing what you have

If you already have a wall that leans or bulges, it is fair to ask whether it can be repaired. A short section that has shifted can sometimes be taken down and rebuilt on a better base. If the whole wall was built without drainage, or the base has failed along its length, a new wall is usually the better fix. We will show you what we see and explain both options. If repair makes sense, our Retaining Wall Repair service covers it.