"Trenchless" gets marketed as the modern answer to every sewer problem. It is a very good answer to some of them and the wrong answer to others. Here is a straight comparison.
The three methods
| Open trench | Pipe lining (CIPP) | Pipe bursting | |
|---|---|---|---|
| How it works | Dig along the pipe, remove it, lay new pipe | Cure a resin liner inside the old pipe | Break old pipe outward while pulling new pipe in |
| Digging | Full trench, or a pit at a spot repair | Usually none beyond the cleanout | Two small pits |
| Fixes sags and slope | Yes | No | No |
| Works on collapsed pipe | Yes | No | Sometimes, if a cable can pass |
| Pipe size afterward | Any size chosen | Slightly smaller | Same or larger |
| Re-routing possible | Yes | No | No |
Where trenchless clearly wins
When the pipe runs under something expensive to remove and replace, such as a paver driveway, a pool deck, a screened lanai slab or mature trees, and the old pipe still has an acceptable path and slope. In those cases avoiding a trench can save more in restoration than the method costs extra.
Where digging is the right answer
- The line has one or more sags; no trenchless method fixes slope.
- A section has collapsed and nothing can pass through.
- The line needs to be re-routed, or new connections added along its length.
- The damage is a short, shallow section under open lawn, where a small excavation is quick and inexpensive.
Common misconceptions
"Trenchless is always cheaper." Per foot, it usually costs more. It is cheaper overall only when it avoids significant restoration.
"No digging at all." Lining often needs none; bursting needs two pits; any method may need a pit at the connection.
"Lining fixes any pipe." The host pipe must be round enough and continuous enough to form the liner. Collapsed or badly deformed sections must be replaced first.
The right method comes from the camera footage, not from a sales preference. If a contractor offers only one method, ask why the others will not work on your line.
How to choose
- Get a camera inspection with defect locations and depths.
- Check the slope: any sags rule out a trenchless-only fix for those sections.
- List what is above the line and what restoration would cost.
- Price the methods that fit, side by side.
Read more about trenchless sewer repair in Sarasota, full replacement and collapsed line repair.