Sewer Pipe Lining Questions, Answered Plainly

Sewer pipe lining, usually meaning cured-in-place pipe or CIPP, builds a new pipe inside the old one. A flexible tube saturated with resin is fed into the existing sewer through a cleanout or manhole, pressed against the pipe wall with air or water, and cured until it hardens into a continuous, jointless pipe. The old clay, cast iron, concrete or Orangeburg stays in the ground as a mold; the liner carries the flow from then on.

Liner manufacturers rate their products for a 50-year design life, and the earliest CIPP installations from the 1970s are still in service. Installer warranties vary; many residential installers warranty their lining work for 10 to 25 years. The warranty that counts is the written one delivered with the job, not a figure on a website.

No. A liner takes the exact shape of the pipe it cures in, so a low spot that holds water before lining holds water after. A belly, reverse slope or a crushed section needs pipe bursting, a sectional dig or an open-cut replacement. A reputable installer will show you the belly on camera and say so before quoting.

Often, yes. Orangeburg, the bituminized fiber pipe used in many subdivisions from the 1940s to the early 1970s, can carry a liner as long as it still holds a round shape. Experienced installers have lined thousands of feet of it. Once it has gone oval or blistered inward, the tube cannot be inverted through it and bursting or replacement takes over.

Residential lining is priced by the foot and typically runs from the low hundreds of dollars per foot for a straightforward 4-inch lateral to considerably more where the line is deep, long, has multiple branches to reinstate or requires a pit for access. A full house lateral commonly lands in the mid four figures to low five figures. The comparison that matters is against the alternative: an open trench through a slab, a driveway or a street carries restoration, permit and traffic-control costs the liner avoids. Nobody can price a line responsibly without a camera inspection.

Most residential laterals are lined in a single day: cleaning in the morning, liner in and curing by early afternoon, branch reinstatement and the final video before the crew leaves. Pipe bursting a lateral usually takes one to two days because two pits have to be opened and closed. A commercial building or a municipal reach is scheduled in sections so service is interrupted for hours, not days.

In most of the country the property owner owns and maintains the lateral from the building to its connection at the public main, including the stretch under the sidewalk and street. Some cities and districts take responsibility from the property line or the curb outward, and a few share the cost of lateral repairs. The rule is set by the local sewer authority, not the state, and it is the first thing to confirm before any work is scoped. Each state guide on this site describes the common patterns.

Almost always. Lining the private lateral is plumbing work that takes a permit from the local building or plumbing authority, and many sewer agencies also require their own permit or an inspection of the finished liner where it meets the public main. If any pit is opened in the right-of-way, an encroachment or street-opening permit applies as well. A licensed installer pulls these as part of the job.

CIPP is a structural liner: a resin-saturated tube cured in place that stands on its own even if the host pipe falls away. Epoxy coating is a thin layer brushed or sprayed onto the inside of a small-diameter pipe to seal pinholes and stop corrosion; it depends on the host pipe for strength. Spin-cast lining sprays cementitious or geopolymer mortar onto the wall of a large-diameter pipe, culvert or manhole with a rotating head, building a structural shell inches thick. The pipe's size, material and condition decide which applies.

Yes, and they are among the most common lining jobs on commercial and municipal property. Corrugated metal storm pipe rusts through along the bottom, concrete storm lines open at the joints, and roof drains under slabs crack. CIPP handles storm pipe from a few inches up to several feet; spin-cast takes over on large culverts and arches. Flow has to be managed during the cure, which is why these jobs are scheduled around weather.

Pipe bursting pulls a conical head through the old pipe, fracturing it outward into the soil, while a new high-density polyethylene pipe is pulled in behind. It is used when the old pipe is crushed, collapsed, badly offset or too small, none of which a liner can fix. It needs a pit at each end and cannot be used where the old pipe is encased in concrete or wrapped in other utilities.

A short liner, typically two to twelve feet, cured over a single defect such as one cracked joint, one root intrusion or one leaking connection. When the rest of the line is sound, a point repair fixes the problem for a fraction of the cost of lining the whole run. It is installed through a cleanout or manhole with no digging.

Because every method on this site depends on the shape and condition of the pipe, and no one can see that from the surface. The inspection records the whole line, locates each defect from above with its depth, and lets the installer rule methods in or out. A lining quote given without video is a guess, and a liner cured over a belly or a collapse is money spent on a problem that is still there.

A liner reduces the inside diameter by a fraction of an inch, but the cured surface is far smoother than clay, cast iron or concrete, so flow capacity is usually unchanged or better. On a scaled cast iron line that has been reduced to half its size by rust, lining after descaling increases capacity dramatically.

Installers listed as CIPP Verified Installers have been prequalified: at least five years in business, a 4.5-star or better Google rating, and vetting of their licensing, completed work and lining equipment before the listing goes live. Where a state has no listed installer, the national line locates a qualified trenchless contractor for you at no charge, and that contractor is then screened the same way.

In a covered state your request goes to that state's verified installer, who schedules a camera inspection. In an open territory it goes to the national line, and we locate a qualified lining contractor near you and make the introduction. Either way you receive a recorded inspection, a written scope that names the method and the reasons for it, and a price. Estimates are free.