Trenchless sewer repair in San Diego: lining and pipe bursting

Two methods, not one

Cured-in-place pipe lining (CIPP). A felt or fiberglass tube saturated with epoxy resin is pulled or inverted into the existing pipe, inflated against the wall, and cured with hot water, steam or UV light. When it hardens you have a new, jointless pipe inside the old one, about a quarter inch thick. Roots have nothing to get into. The old pipe just becomes the form. That's why trenchless sewer lining is popular on root-prone clay, and why epoxy sewer lining works on scaled cast iron once it's cleaned. Trenchless pipe lining: San Diego contractors can often run it from a single access point, usually the cleanout, with no pit at the street.

Pipe bursting. A steel bursting head is pulled through the old pipe by a cable or rods from one pit to another. It splits the old clay or cast iron outward into the soil and pulls a new HDPE pipe in behind it, same size or one size larger. You end up with a completely new pipe, fused with no joints, on the same alignment. With pipe bursting, San Diego lots need a pit at each end, usually one at the house and one at the curb or the main.

Which one for your line

Lining is the choice for the cast iron under a slab and for any line with several branch tees. Bursting is the choice for a straight yard lateral that's broken badly enough that a liner has nothing to hold onto, or when the old 4-inch pipe should really be a 6-inch. Neither fixes a belly, because both follow the old pipe's path; a belly needs a dig at that spot, and a good contractor will say so. Lining vs pipe bursting goes into the choice in more detail.

Why it's the default here

Digging up 20 feet of driveway and a sidewalk panel, then pouring them back and matching the finish, adds $2,000–$5,000 to an open-trench job before you count the fence, the planter and the tree. In the City of San Diego the owner is generally responsible for the lateral to the main, and work in the sidewalk or street normally needs a right-of-way permit and restoration — confirm with the City of San Diego (or your city or sanitation district). So a trenchless bid at $9,000 is often cheaper than an open-trench bid at $6,000 once the restoration is on paper. Ask for both on the quote and add them up.

The other reason is roots. A lined or burst pipe has no joints. On a lot with a 40-year-old ficus or a row of eucalyptus along the alley, that's the difference between a sewer you think about every spring and one you forget about.

What a trenchless job looks like

1. Camera inspection and cleaning. Cast iron gets descaled by hydro jetting, clay gets root-cut, and the camera confirms the pipe is a candidate.
2. Permits pulled by the contractor doing the work, and DigAlert (811) marking.
3. Pits dug where they're needed: none or one for a liner, two for a burst. In dirt they're a couple of feet square; in concrete a neat opening is saw-cut.
4. The liner is installed and cured (three to six hours), or the burst head is pulled and the new HDPE fused and connected.
5. Branch lines are reinstated with a robotic cutter if lined. A new cleanout is set if the quote includes one.
6. Inspection, an after video (ask for it), and pits backfilled and compacted.

Most jobs take about a day. You're without drains for the hours the liner is curing or the burst is in progress; ask for the window in advance.

What it costs

Trenchless pricing here is mostly per foot plus the pits and the connection at the main. Lining runs about $90–$200 per foot, bursting $100–$250 per foot, so a 50-foot lateral is usually $6,000–$14,000 and a long or deep one up to $20,000. Under-slab lining is priced separately. The cost page has the tables and trenchless sewer repair cost in San Diego walks through what moves the number. Compare it with open-trench replacement on the same quote; ask for both when both would work.

Questions to ask a trenchless bidder

1. Is my pipe a candidate for lining, bursting or both, and what on the footage tells you that?
2. Where will each pit go, and what is on top of that spot: dirt, concrete or the sidewalk?
3. Does the price run all the way to the connection at the main?
4. How many branch lines tie in, and is reinstating each one in the price?
5. Is the cleaning before the liner included, or billed by the hour?
6. Will I get the after-cure or after-burst video, and the warranty in writing?

A bidder who answers all six from the camera file, not from memory, is quoting your pipe rather than an average one.

Telling a good liner from a bad one

The after video shows it. A good liner is smooth and round from end to end, with no folds, and the branch openings are cut clean to the full size of the pipe that ties in. Warning signs are wrinkles or ridges along the floor, a liner end that leaves a lip where paper can catch, and branch cuts that are only partly open. Small wrinkles at a bend can be normal; a ridge that holds water is not. Ask the contractor to explain anything on the screen you're unsure about, and keep the file.

Where trenchless doesn't fit

It's worth knowing the cases before anyone quotes. A section that has fully collapsed needs a dig at that spot. A belly needs a dig and new bedding. A pipe that changes direction sharply several times may need an extra pit. And a lateral that is mostly under open lawn is often cheaper to trench. None of this means trenchless is off the table; it means the bid should show the dig spots as separate lines.