No-Dig Repair

No-dig repair (also called trenchless repair) is an umbrella term for plumbing techniques that rehabilitate or replace underground pipes without excavating a trench along the pipe's path. Instead, access is made through small pits at strategic points, and the repair is completed from inside the pipe or with minimal surface disturbance. No-dig methods are increasingly the preferred approach for sewer lateral repairs because they preserve landscaping, driveways, and concrete while often completing repairs faster and at lower total cost than open-cut trenching.

Main no-dig methods

• CIPP (Cured-In-Place Pipe lining): a flexible resin-saturated liner is inserted into the damaged pipe and inflated against the pipe wall, then cured (with heat, UV light, or ambient air) to form a new, seamless pipe inside the old one. Effective for cracked, root-infiltrated, or corroded pipes. Reduces interior diameter by about ¼ inch. Lined pipes typically carry a 50-year warranty.
• Pipe bursting: a conical bursting head is pulled through the old pipe by a cable, fracturing it outward into the surrounding soil while simultaneously pulling a new pipe (typically HDPE) in behind it. Replaces rather than lines the old pipe — suitable when the old pipe is severely deteriorated or undersized. Maintains or increases pipe diameter.
• Spray lining (pipe coating): a structural epoxy coating is sprayed onto the interior pipe walls. Less invasive than CIPP, appropriate for small-diameter lines and when lining thickness is limited.
• Pipe eating (pipe reaming): a reaming head removes the old pipe material as a new pipe is installed behind it — similar to pipe bursting but used for pipe materials that don't burst cleanly.

When no-dig is the right choice

No-dig is generally superior when: pipes run under driveways, patios, or landscaping; tree root damage has caused localized cracks; the pipe is structurally intact enough to line; or the homeowner cannot accept surface disruption. Open-cut excavation may be preferable when multiple access points have already failed, when severe pipe collapse or offset joints preclude lining, or when pipe depth makes trenchless access impractical.