Sewer pipe lining in New York

What is buried under a New York property

The sewer lateral is the pipe that carries everything from the building to the public main, and in New York it was installed with whatever material was standard when the house went up. Older homes drain through vitrified clay or terracotta laid in short lengths, each joint a place for roots and groundwater to get in. Mid-century construction leaned on cast iron, which rusts from the inside until the bottom of the pipe is a channel, and in many areas on Orangeburg, a bituminized fiber pipe that softens and loses its shape over decades. Anything built from the 1970s onward is usually ABS or PVC, which does not corrode but can crack, separate at a glued joint, or sag where backfill was poor. Which of these you have depends on the age of the house and the ground it sits on; whether the house stands on a slab, a crawlspace or a basement changes how hard it is to reach by any method other than lining.

How a liner becomes the new pipe

Cured-in-place pipe lining starts with a camera to map the line and a hydro jetter to strip it to clean wall. A tube of felt or fiberglass is then soaked in resin and either inverted or winched into the pipe from the cleanout. Air or water pressure expands the tube against the old pipe, and heat or UV light sets the resin into a hard, continuous pipe with no joints. The clay, iron or Orangeburg around it stops being the pipe and becomes a form. Roots have no seam to enter, groundwater has no gap to infiltrate, soil movement has a flexible structural pipe to work against instead of brittle joints, and the smooth bore moves more water than the rough, scaled pipe did. The whole thing happens through an opening a few inches across, which is why nothing on the surface has to be disturbed. What the method is and how it is specified is laid out at the CIPP reference.

Why some lines are burst instead

A liner takes the shape of what it is cured inside, so the host pipe has to have a shape worth taking. Sometimes the video shows a collapsed section, Orangeburg that has flattened, a belly that holds standing water between two high points, or a 3- or 4-inch line serving a house that has added bathrooms since it was built. In those cases a contractor who knows the trade will say lining is the wrong tool and propose pipe bursting: a bursting head drawn along the old line splits it outward while new fused polyethylene pipe follows behind, through a pit at each end and nothing in between. A good trenchless contractor picks the method the pipe calls for.

The camera is the estimate

Nothing about a buried pipe can be judged from the surface. A slow drain, a gurgle in a toilet, a backup after heavy rain and a wet spot in the yard can each come from several different defects, and the method that fixes one may do nothing for another. That is why every job in New York should begin with a recorded camera run from the cleanout to the main, with each defect called out by distance and depth, and end with a second recording showing the cured liner. You should hold both videos and a written finding before you are asked to sign anything, and the proposal should name the method and point to the footage that justifies it. The directory of contractors who work this way is at the verified installer directory; what they have to demonstrate to be listed is explained at how installers are verified.

How the day runs

A residential liner in New York is normally finished in one visit. The crew sets up, runs the camera and cleans the line in the morning; the liner is wet out, installed and curing by midday; by afternoon it has hardened, any branch connections have been reopened from inside with a cutter, and the camera records the result. Water use pauses for several hours while the resin sets, and the crew tells you the window beforehand. The weather matters little, since the pipe is underground and the cure is driven by the equipment, so the work is scheduled in any month.

What you keep afterward

Expect the pre-repair video, the post-cure video, the permit record and a written warranty that states its term. Liners of this type are engineered to a fifty-year design life. Those documents answer the question a home inspector, a buyer or a lender will ask the next time the property changes hands, and they are worth filing with the deed.