Key takeaways
- Roots don't usually break a sound pressurized line; they find and enlarge an existing leak, and they crush or displace drain lines.
- A line that leaks near a big tree will have roots packed around the break, which is a clue during the locate and a nuisance during the dig.
- Rigid pipe with joints near trees fails; continuous flexible pipe tolerates root pressure far better.
- Routing a new line outside the drip line of large trees is cheaper than fighting roots for forty years.
What roots actually do
Roots grow toward water. A pressurized water line that is intact and sealed doesn't attract them, but the moment it develops a small leak the surrounding soil becomes the wettest place in the yard, and roots arrive in force. They wrap the pipe, work into the leak at a fitting, and enlarge it. On gravity drain lines, which are not sealed under pressure, roots enter at every joint and eventually fill the pipe. And the sheer growth of a large fir or maple root over decades can lift, bend and crush pipe that sits in its path.
Which lines are at risk
Old galvanized and copper with threaded or soldered joints near trees. Early polyethylene that has gone brittle. Clay tile and thin corrugated drain lines, which roots love. Any line with a buried joint within the drip line of a big tree. Continuous HDPE or PEX with no buried joints is the most root-tolerant choice; it flexes around root pressure and gives roots nothing to enter.
Locating in a root zone
Roots complicate a dig more than a locate. The acoustic signature of a leak doesn't change because roots are present, though a leak that has been enlarged by roots is often louder. What changes is the excavation: hand work with a mattock and a saw, careful cutting of roots that have to be cut, and respect for the tree's structural roots so a water line repair doesn't become a tree removal.
Repair and routing
A break in a root zone is repaired in continuous flexible pipe with the fittings moved outside the root mass where possible. For a full replacement, we route the new line outside the drip line of large trees even if that means a longer run. It's cheaper than the alternative, and it keeps the trees.
Written by the crew at 360 Leak Finders
We locate, excavate and repair buried water lines and exterior drains across Kitsap County, 24 hours a day. If this guide raised a question about your property, call (206) 354-9906.