What is pipe lining (CIPP)?
CIPP stands for cured-in-place pipe. A flexible liner saturated with resin is placed inside the existing sewer pipe, expanded against the pipe wall and cured so it hardens into a new, seamless pipe within the old one. It seals cracks and joints, which also closes the openings roots use.
What is pipe bursting?
In pipe bursting, a bursting head is pulled through the old pipe, breaking it outward into the surrounding soil while a new pipe, commonly HDPE, is pulled in behind it. The old pipe is replaced rather than relined, and the new pipe can sometimes be a larger size.
Pipe lining vs. pipe bursting at a glance
| Pipe lining (CIPP) | Pipe bursting | |
|---|---|---|
| How it works | A resin-saturated liner is cured inside the old pipe | A bursting head pulls a new pipe through the old one |
| Best for | Pipe that is cracked, leaking at joints or root-damaged but still holds its shape | Pipe that is badly broken or deteriorated, or needs full replacement |
| Result | A pipe within a pipe, with a slightly smaller inside diameter | A new pipe in place of the old one |
| Access needed | Small access points at the ends of the section | Entry and exit pits at the ends of the section |
| Limits | Badly collapsed or misaligned pipe may not be suitable | Needs room for the pits and suitable ground and utility conditions |
How the decision is made
Everything starts with a camera inspection that shows the pipe's material, damage and any collapsed or offset sections. The line is then cleaned, often with hydro jetting, and measured, and the method that fits the pipe is chosen. Permits and utility locates are part of planning; see who is responsible for the side sewer in Bothell.
What happens during a trenchless repair
- Camera inspection to confirm the damage and the best method
- Cleaning the pipe so the liner or new pipe can be installed
- Creating small access points at the ends of the section
- Installing the liner and curing it, or pulling the new pipe through
- Final camera inspection and testing
- Restoring the access points
When excavation is still needed
A badly collapsed pipe, a severe misalignment or a deep sag may still need to be dug up and replaced. The inspection tells you before you commit.
Frequently Asked Questions
Can a pipe with roots be lined?
Usually the roots are cut and the pipe is cleaned first, then the pipe is lined if the inspection shows it is suitable. Lining seals the joints that roots used to get in.
Does lining reduce the pipe's capacity?
Lining slightly reduces the inside diameter, but the smooth new surface helps flow. Your plumber can confirm the lined pipe will have adequate capacity for the building.
Which is better, lining or bursting?
Neither is better in every case. Lining fits pipe that is damaged but intact; bursting fits pipe that is too broken to line. A camera inspection decides.
Related Services
- Trenchless Sewer Line Repair
Sewer line repair using pipe lining or pipe bursting that avoids digging a long trench through your yard.
- Video Camera Pipe Inspection
A waterproof camera shows what is inside your drain or sewer line, so problems can be found without digging.
- Hydro Jetting Service
High-pressure water jetting that clears grease, scale, roots and stubborn blockages from drain and sewer lines.