The Trenchless Pipe Lining Process

Trenchless Pipe Lining in Delaware County: What It Is and When It Applies

Trenchless pipe lining is a sewer repair method that rehabilitates a damaged lateral without excavating the pipe. Instead of digging a trench along the full run from your foundation to the street, technicians work through cleanout access points — inserting, positioning, and curing a structural liner inside the existing pipe. The ground above the pipe is not disturbed. Driveways, walkways, landscaping, and lawns stay intact.

Trenchless pipe lining is the correct repair for most Delaware County residential laterals that have root intrusion, cracked joints, or infiltration but are structurally intact enough to hold a liner in position. In Delco, where the majority of homes were built between 1920 and 1965 using clay tile sewer laterals, trenchless lining is the standard-of-care repair — not an upgraded alternative to excavation.

The Two Trenchless Methods: CIPP Lining and Pipe Bursting

CIPP Pipe Lining

Cured-in-place pipe (CIPP) lining installs a resin-saturated liner inside the existing damaged pipe. The liner — typically a felt or fiberglass tube pre-saturated with a thermosetting or UV-curable resin — is inverted or pulled into position through a cleanout and held against the pipe walls under pressure until the resin cures. After curing, the liner is rigid and structural, sealed against every joint, crack, and root entry point along its run. The host pipe stays in the ground as a form.

CIPP lining requires the host pipe to be intact enough to hold the liner in position. Crushed sections, severe vertical offsets, or missing pipe segments prevent the liner from seating correctly. The camera inspection before the job identifies whether the pipe is a CIPP candidate or whether the damage requires a different approach.

Pipe Bursting

Pipe bursting is the trenchless sewer replacement method for laterals too deteriorated to accept a liner. A hydraulic bursting head is pulled through the damaged pipe from a receiving pit at one end, fracturing the old pipe outward into the surrounding soil while simultaneously pulling a new HDPE pipe through the cleared path. The new pipe is continuous — no joints — with a smooth bore that root systems cannot enter and no mortar to loosen over time.

Pipe bursting requires small excavations at each end for access: one at the cleanout near the foundation and one at the connection to the street main. These access points are a fraction of the excavation required by open-cut replacement of the full run.

Before Any Trenchless Repair: Camera Inspection

A camera run through the lateral is the only reliable way to determine which trenchless method applies — or whether the pipe has structural damage that requires open-cut excavation. The camera establishes pipe material, diameter, the location and severity of defects, and whether the host pipe is intact enough for lining or too compromised for any trenchless approach.

In Delaware County, the camera typically finds clay tile with loosed mortar joints and root intrusion in homes built before 1960. Cast iron with interior corrosion and pitting is common in the 1920s row homes and twins throughout the county. Orangeburg pipe — a compressed fiber and tar composition used in some 1945–1975 developments — deforms and collapses under load; Orangeburg is usually a pipe bursting or open-cut job, not a CIPP lining candidate.

We record every camera inspection and provide you a copy of the video. The camera video is your record of why the repair was recommended. If a contractor quotes you a repair without showing you the camera footage of the defect, ask for it before signing anything.

Why Trenchless Matters in Delaware County Specifically

Delaware County’s older neighborhoods have dense landscaping, mature street trees with root systems that extend far beneath the lateral, and driveways and walkways that were installed over the sewer line after the home was built. In many Delco communities, the sewer lateral runs under a concrete driveway for part of its length. Open-cut excavation in these situations costs substantially more than trenchless repair and requires significant restoration work after the pipe is replaced.

Many shared laterals — common in the county’s stock of twins and row homes — run beneath party walls or under structures that cannot be excavated without affecting both properties. CIPP lining is typically the only practical repair option for a shared lateral with active root intrusion.

What Trenchless Pipe Lining Does Not Fix

CIPP lining seals cracks, joints, and root entry points in a structurally intact pipe. It does not correct a bellied pipe — a section that has settled below grade and holds standing water. It does not fix an active collapse, a pipe with missing sections, or severe vertical offsets. Pipe bursting addresses structural loss but still requires the pipe path to be clear enough for the bursting head to travel its full length. When neither method applies, open-cut excavation is the right answer, and a contractor who recommends trenchless on a pipe that needs open-cut is not serving your interests.

Frequently Asked Questions

How long does a trenchless pipe lining job take?

Most residential CIPP lining jobs in Delaware County are completed in one day. Camera inspection, hydro-jetting to clean the pipe, liner installation, and curing all happen in a single visit. Pipe bursting typically takes one day as well, though access conditions and run length affect the timeline.

How long does a CIPP liner last?

CIPP liners installed to ASTM F2561 standards — the governing standard for non-pressure drainage pipe rehabilitation — are designed for a 50-year service life. The liner is rated to carry full structural load without the host pipe, so degradation of the original clay tile or cast iron over that period does not affect liner performance.

Can I line only a section of the pipe?

Yes. Spot lining installs a short liner segment over a specific crack, offset joint, or root entry point when the rest of the lateral is in acceptable condition. A full-length camera run determines whether a spot liner resolves the problem or whether the condition extends far enough to warrant lining the full run.

Schedule a Trenchless Evaluation

Call Advanced Drains and Underground Solutions at 1-855-DONT-DIG (1-855-366-8344) to schedule a camera inspection and trenchless evaluation. We serve all of Delaware County and the adjacent communities in Montgomery and Chester counties. Seven days a week.