Trenchless vs Traditional Sewer Repair: How to Choose

Traditional open-cut replacement means excavating along the line of the pipe, removing the failed sections, laying new pipe at the correct grade, bedding and backfilling it, and then restoring whatever was on top. It is definitive. Every part of the run is new, the grade can be corrected, and there is no dependence on the condition of what was there before.

Trenchless cured-in-place lining draws or inverts a resin-saturated liner into the existing pipe, presses it against the wall and cures it, leaving a continuous jointless pipe inside the old one. Access is through existing cleanouts or small pits at each end rather than a trench along the whole length. Branch connections are then reinstated so everything that drained into the line still does.

The host pipe. A liner needs a pipe that still holds its shape. A fully collapsed section, a badly offset joint or a severe belly disqualifies that stretch — and the camera survey is what establishes it. This is the first and most important gate, and no honest quote exists before it.

What is on top. This is where South Florida differs. Laterals here routinely run beneath paver driveways, pool decks, seawall setbacks, mature landscaping and slab. Restoration of those surfaces is frequently a larger cost than the pipe work itself, and trenchless removes most of it from the equation.

Grade. Lining follows the existing pipe exactly. If the survey shows a belly holding water, lining it produces a smooth belly that still holds water. Only excavation and a re-lay corrects grade.

Length and depth. A long, deep run in a shallow water table means a large excavation that needs dewatering along its length. That pushes hard toward lining. A short, shallow run under grass pushes the other way.

Diameter. A liner slightly reduces internal diameter. On a correctly sized lateral this is immaterial; on one that was already undersized it enters the calculation.

Lining tends to win on: runs under driveways, pavers, pool decks and finished floors; long runs on large lots; properties where excavation would cross association-controlled or shared ground; commercial sites that cannot close access for a week; and under-slab cast iron inside an occupied house, where the alternative is cutting the floor room by room.

Open-cut tends to win on: short, shallow runs under lawn; lines with a grade problem that has to be corrected; sections that have collapsed or are severely deformed; and situations where the pipe has to be upsized.

A hybrid is extremely common and often the cheapest correct answer — a short open-cut repair at the one failed section, followed by lining the remainder of the run.

• A shallow water table across most of coastal Broward and Miami-Dade means deep excavation needs dewatering, which is a real line item and belongs in the quote rather than appearing halfway through.
• Aggressive root systems — ficus, banyan, black olive — enter at leaking joints. Lining seals the joints along the lined section, which is why it is often the durable answer on a canopied street.
• Clay lateral sections still exist in the oldest parts of Fort Lauderdale, Hollywood and Miami. Clay fails at joints; cast iron fails through the wall. The failure mode changes which repair fits.
• Work in the public right-of-way and the tie-in at the main may be the municipality's responsibility rather than yours. Establish that boundary before anyone quotes across it.

1. Can I see the camera footage before and after, and keep a copy?
2. Where exactly does the fault sit, and how deep, marked at the surface?
3. Which branch connections enter this run, and how will each be reinstated?
4. Who is responsible for restoration, and to what standard?
5. What permits and inspections does my municipality require for this work?
6. If lining is not being offered, why not — what did the survey show?

Nobody should be excavating a South Florida yard on a verbal description of what is in the pipe. The footage is the document the whole decision rests on.