Why roots find pipes
Sewer pipes leak tiny amounts of water vapour and nutrients through joints and cracks. Roots grow toward that moisture. Once a fine root enters a joint, it finds a steady supply of water and food and grows into a mass that catches paper and waste.
Which pipes are at risk
- Clay pipe with many joints, common in older laterals.
- Pipe with cracks or offset joints from settlement.
- Laterals near large, thirsty trees such as willows, silver maples and poplars.
Modern PVC laterals with solvent-welded joints resist root intrusion well, though roots can still exploit damage.
Field note. A tree on the city boulevard may be the culprit even if you have no trees on your lot. Roots travel.
Signs of root trouble
- Slow drains throughout the house.
- Gurgling toilets.
- Recurring backups in the basement floor drain.
- Roots on the cable after drain clearing.
Treatment options
| Option | What it does | Longevity |
|---|---|---|
| Cutting | Removes roots with a cable cutter | Temporary; regrowth expected |
| Jetting | Removes roots and flushes debris | Temporary; cleaner result |
| Spot repair | Replaces the damaged section | Long-term for that section |
| Lateral replacement | New pipe from house to main | Long-term |
Planting near laterals
Before planting a tree, find the route of your lateral and keep large trees away from it.
See sewer camera inspection and sewer line repair.