Drains
Tree roots in drains: why it happens and how to stop it
Tree roots invade drains because they seek out the water and nutrients inside sewer and stormwater pipes, entering through tiny cracks and loose joints. Once inside they grow into dense mats that trap waste and block the drain. The lasting fix is cutting the roots then relining or repairing the damaged pipe.
If your drain blocks every few months, especially after rain, and you have mature trees anywhere near the property, tree roots are the prime suspect. It is one of the most common serious drain problems Terry sees in the older streets of Berala, Auburn and the inner west, where established trees and decades-old pipes sit side by side.
Why roots target your drains
Roots are simply looking for water. Sewer and stormwater pipes carry a steady supply of moisture and nutrients, and they leak tiny amounts of vapour from any imperfect joint or hairline crack. Roots sense that moisture and grow towards it. Once a fine root tip finds a gap, it pushes inside, then thickens and branches into a mat that acts like a net, catching everything that flows past.
Older pipes are most at risk:
- Earthenware and clay pipes, common in homes built before the 1980s, have joints every metre or so that roots exploit.
- Pipes that have shifted, cracked or sagged over time open up new entry points.
- Even PVC pipes can be invaded at poorly sealed joints.
The warning signs
Tree root blockages announce themselves. Watch for:
- Gurgling sounds from toilets and drains.
- Slow drainage across multiple fixtures at once.
- Blockages that return every few months despite clearing.
- Problems that get worse in wet weather.
- A sewage smell in the yard.
How Terry deals with it properly
Clearing the roots is only step one. Terry runs a drain camera to find exactly where the roots are entering and how much damage there is. He then cuts the roots out with an electric drain machine or high pressure jetter to get the drain flowing again. But here is the honest part: cutting roots alone is temporary. They will regrow to the same spot, because the crack that let them in is still there.
The lasting fix is to seal that entry point. For many pipes this means relining, where a new pipe is formed inside the old one without digging up the yard, giving a smooth jointless surface roots cannot penetrate. Where a section has collapsed, a dig-and-replace repair may be needed. Terry will show you the camera footage and explain which option suits your pipe and budget, with a fixed quote before any work.
Can you prevent it?
If you are planting, keep trees with aggressive roots well away from where the sewer and stormwater lines run. Regular camera checks catch root intrusion early, while it is cheap to manage, rather than after a pipe has collapsed. If you suspect roots in your drains anywhere in Western Sydney or the inner west, call Terry on 0415 274 542 for a proper look and a straight answer.
Frequently asked questions
- How do tree roots get into sealed pipes?
- Pipes are rarely perfectly sealed. Roots enter through joints, hairline cracks, and gaps that open up as pipes age and shift. They are drawn to the moisture and nutrients inside, and even a tiny gap is enough for a fine root tip to push through.
- Does cutting the roots fix the problem permanently?
- No. Cutting roots clears the drain but they regrow to the same crack within months because the entry point is still open. A lasting fix requires sealing the pipe, usually by relining, so roots can no longer get in.
- What is pipe relining and does it avoid digging?
- Relining forms a new smooth pipe inside the existing damaged one using a resin liner, without excavating the yard in most cases. It seals the cracks and joints roots use to enter, giving a jointless surface that resists future intrusion.
- Can I stop tree roots without removing the tree?
- Often yes. Relining the affected pipe seals the entry points so roots can no longer get in, which usually means the tree can stay. Root-killing foams offer only short-term relief and do not repair the pipe.
- How do I know if it is tree roots and not just a normal blockage?
- Tree root blockages tend to recur every few months, affect multiple drains at once, cause gurgling, and worsen in wet weather. A drain camera inspection confirms it by showing the roots inside the pipe.
Related services
Need a hand from a real plumber?
Terry's been sorting plumbing across Berala and Western Sydney since 1986. Call 0415 274 542 for a straight answer and a fixed price.
NSW Licence L10959 · 40+ years experience