Drain Excavation in Atlanta, GA

Old drain pipe under older houses

Before plastic drain pipe became standard, houses were plumbed with cast iron inside and often clay tile outside. Plenty of those systems still work, but the buried sections are the hardest to keep an eye on and the most expensive to ignore. Drain excavation is the work of digging down, through soil or through a concrete floor, to reach a damaged drain and replace it. In an older Atlanta house, the age and material of the pipe often shape the job more than anything else.

How cast iron and clay give out

Cast iron corrodes from the inside. Over time the bottom of a horizontal line can thin and split lengthwise, a failure plumbers call channel rot, while rough scale on the walls catches paper and grease. Clay pipe resists corrosion but comes in short lengths with many joints, and each joint is a place where roots can work in or where shifting soil can push one section out of line with the next. Typical signs include backups that return weeks after a cleaning, a sewer smell near a floor drain, or camera footage where bare soil shows through a gap in the pipe wall.

Slab, basement floor or crawlspace

Where the pipe runs changes how it is reached. Under a slab-on-grade house, the floor is saw-cut over the break and the soil beneath is dug out. In a basement, the drain often runs under the basement floor toward the wall where it leaves the house, so the cut is made in that floor instead. Homes over a crawlspace are the easy case: the drain usually hangs in the open and can be replaced without digging at all, which makes it a job for drain repair rather than excavation.

Patch a section or replace the run

With old cast iron, the question is how healthy the pipe on either side of the break really is. Splicing two feet of new PVC between lengths that are nearly as thin as the failed piece can mean opening the floor again later. A camera pass along the whole line, from a cleanout or through a removed toilet, shows whether the damage is isolated or spread out. When most of the run is sound, a spot repair with shielded transition couplings is reasonable. When scale and rot show up throughout, replacing the buried run in one dig is usually the steadier choice. Heavily scaled iron is also a poor candidate for aggressive hydro jetting, since the pressure can break through weakened walls.

Permits and underground inspections in Atlanta

Atlanta's Office of Buildings, part of the Department of City Planning, asks for a permit when plumbing is installed, repaired or replaced, and homeowners may apply for their own. Because an underground inspection is on the city's list of trade inspections, a replaced buried drain generally stays uncovered until it has been checked. Work on the line out to the public sewer is a separate job, covered under sewer excavation.

What to have ready before the visit

• Any earlier camera footage or inspection report that mentions the drains
• Where cleanouts are, if you know, and whether a basement floor drain has ever backed up
• Notes on remodels, since buried lines are sometimes rerouted or patched during renovations
• A sense of which flooring you would rather keep intact

Questions about old drain pipe in Atlanta

Is cast iron drain pipe always a problem?

No. Cast iron can last a very long time, and many older lines still carry water well. Age alone is not a reason to dig. The time to act is when a camera shows cracks, deep scale, rot along the bottom or separated joints, or when backups keep returning after professional cleaning.

How long is the floor open during a slab-cut repair?

Usually a few days rather than weeks. The cut, the digging, the new pipe and a water test can move quickly, but a permitted job waits for the underground inspection before the trench is filled. After that the new concrete needs time to cure before tile, vinyl or carpet goes back over it, so plan around the room for a little longer than the plumbing itself takes.

Can a basement floor drain line be repaired the same way?

Yes, in principle. The basement floor is cut and broken out over the damaged section, the pipe is replaced and checked, and the floor is patched with new concrete. Because basement fixtures sit lowest in the house and are the first to flood when the line backs up, the slope and whether a backwater valve makes sense deserve a careful look while the pipe is exposed.

Get the old drain looked at

If an older Atlanta house is showing the signs of a failing buried drain, the place to start is a camera and a straight answer about what the pipe needs. Reach Alpha at (404) 409-4448.