How Do Tree Roots Get Into Drains?
Tree roots are naturally drawn to sources of water and nutrients. Older clay or concrete drain pipes often have small gaps at the joints where roots can enter. Once inside, roots grow aggressively, eventually cracking the pipe open and causing serious structural damage.
Even trees that appear to be a safe distance from your property can have root systems extending 10–15 metres or more. It's not just the obvious culprits like willows and poplars — standard garden trees including ash, oak and sycamore can all cause drain problems.
Warning Signs of Root Intrusion
1. Recurring Blockages
If the same drain blocks repeatedly despite being cleared, root intrusion is a common cause. The roots act as a net, catching toilet paper, wet wipes and debris until the pipe blocks completely.
2. Slow Drainage Throughout the Property
When root damage affects the main sewer run, you may notice slow draining in multiple fixtures across the property — not just one sink or toilet.
3. Gurgling Noises
Air trapped around a partial blockage caused by roots can make drains gurgle when water passes through. This is often one of the first signs.
4. Sunken or Wet Patches in the Garden
If roots have broken a drain pipe open, water from the sewer will leak into the surrounding soil. This can appear as an unexplained wet patch or a sunken area of lawn.
5. Foul Smells
Escaping sewage has a distinctive odour. If you notice persistent bad smells near a drain run in the garden, a cracked pipe is likely.
How Root Intrusion Is Diagnosed
The only reliable way to confirm root intrusion is a CCTV drain survey. A camera is run through the drain, and any root growth is clearly visible on screen. The footage is recorded and a written report produced.
This also shows the extent of any structural damage, which determines the best repair method.
Treatment Options
Root Cutting
For early-stage intrusion, mechanical root cutting (using a rotating cutter head on the jetting machine) can clear the roots without excavation. However, this is a temporary solution — roots regrow unless the entry point is sealed.
Drain Relining (No-Dig Repair)
Drain relining is the most effective long-term solution. A resin-impregnated liner is inserted into the damaged pipe and inflated, then cured in place. This creates a new pipe inside the old one, sealing all cracks and preventing further root entry — without any digging.
Excavation and Pipe Replacement
For severely damaged or collapsed pipe sections, traditional excavation and replacement may be required. This is the most invasive option but sometimes unavoidable.
Act Early
Root intrusion rarely gets better on its own — it always gets worse. The earlier it's treated, the less damage is done and the lower the repair cost.
If you have mature trees near your property and are experiencing any of the above symptoms, a CCTV survey is the quickest way to get a definitive answer.
DrainGuard 24/7 Ltd provides CCTV surveys and root treatment across Northeast England. Call 07887 212 447 — available 24/7, no call-out fee.
