What pipe lining is and why homeowners ask about it
Pipe lining, often called cured-in-place pipe, repairs a damaged sewer pipe by forming a new pipe inside the old one. A flexible liner soaked in resin is pulled or inverted into the line, expanded against the old wall and cured hard with hot water, steam or ultraviolet light. The result is a smooth, jointless pipe.
Homeowners ask about it because the alternative is often a trench through a lawn, a driveway or a garden. Lining can renew a pipe through a small access point, which is attractive in a town with tight lots, stone walls and ledge close to the surface.
What the process looks like
The line is cleaned first, often by cable and hydro jetting, so the liner can lay against clean pipe. A camera then confirms the length, the diameter and any defects that would stop a liner. Roots are cut out, and protruding joints are ground flat.
The liner is installed, cured and then cut open at the ends. A final camera run records the finished pipe, and any lateral connections to other fixtures are reopened. The whole process is usually a one or two day job for a typical house lateral, depending on length and preparation.
When lining fits
Cracked but aligned pipe
A crack or open joint that has not shifted the pipe out of line.
Root intrusion at joints
Roots enter at joints and a smooth liner closes the entry points.
Corroded cast iron
Heavy scale inside an otherwise sound pipe.
Hard to dig lines
Pipes under driveways, patios or ledge-adjacent ground.
Local note: what Marblehead is doing with its own sewer
The town runs an Infiltration and Inflow program with flow metering, smoke testing and sewer rehabilitation work in defined work areas, plus home inspections for improper connections. Its Water and Sewer Department maintains more than one hundred miles of sewer main, and it pumps sewage to the South Essex Sewerage District plant in Salem.
The town's work covers the public system. The pipe from your house to the main is generally your responsibility, so ask the Water and Sewer Department where the boundary sits at your address before you hire anyone to line or dig.
Cured-in-place liners are commonly specified to ASTM F1216, the published standard practice for inversion and curing of a resin-impregnated tube, so ask the contractor which standard their product follows.
Think your sewer line needs work?
Call the 24/7 line to book a camera inspection.
When it does not
A pipe that has collapsed, that has a serious belly holding water or that is badly offset cannot be lined, because the liner would follow the defect. Those pipes need a dig repair or pipe bursting. A line with too many sharp bends can also be hard to line.
Lining also reduces the pipe's inside diameter slightly. For most residential laterals that is not a problem, but the plumber checks the size before recommending it.
Questions to ask any contractor
- Will you run a camera before and after, and give me the video?
- What is the liner material and warranty?
- How will you reopen the connections to the house?
- Who pulls the permit and arranges the inspection?
Lining compared with digging
Digging replaces the pipe entirely and lets you fix the grade, but it disturbs the yard and takes longer. Lining leaves the yard alone and renews a pipe at the same grade. If the pipe has a belly, only a dig repair can fix the grade, and a plumber tells you honestly which situation the camera shows.
Start with a sewer camera inspection. If it finds a defect, sewer line repair explains the options in more detail.
What lining costs you in time and access
Plan for a day when the water is off or restricted. The crew needs the line empty and dry, so toilets, sinks and laundry stay off during curing, which can take several hours. Ask for the window up front so you can plan around it.
Access matters as much as pipe length. A cleanout makes the job straightforward. Without one, the crew may enter through a toilet flange or a roof vent, and a new cleanout is often worth adding while the work is under way.
Lining versus digging
The right method follows the camera.
| Factor | Lining | Dig repair |
|---|---|---|
| Yard disturbance | Minimal | Trench |
| Fixes a belly | No | Yes |
| Fixes a collapse | No | Yes |
| Fixes cracks and roots | Yes | Yes |
Pipe lining questions
Manufacturers describe liners as long-lived when installed on a properly prepared pipe, but warranties vary. Ask for the specific terms in writing.
Often, if it is sound enough. See repiping if the supply side is also failing.
Ask the Building Department and the Water and Sewer Department. Permits for plumbing work are issued to licensed plumbers.
It closes the openings roots use, which stops most intrusion at the lined joints. Roots can still attack unlined connections.
Water use stops while the liner cures, usually for several hours. The contractor tells you the window.
Only a camera inspection can say. The plumber checks for collapses, bellies and offsets that rule it out.
That depends on who owns each section. Ask the Water and Sewer Department and your neighbor before work begins.