Tree Roots in Your Pipes: The Morwell Terracotta Problem

If you live in one of Morwell's older homes — and most of Morwell's housing stock was built between the 1950s and 1970s by the State Electricity Commission — recurring blocked drains are probably a familiar frustration. And in the vast majority of cases, the culprit is the same: tree roots growing into your original terracotta sewer line. Here's why it happens, why it keeps happening, and the permanent fix.

Why Terracotta Pipes Attract Roots

Terracotta (earthenware) pipes were the standard sewer material for decades, and they're still in the ground under thousands of Morwell homes. Unlike modern PVC, which is joined with sealed rubber rings, terracotta pipes were laid in short sections with porous mortar or tar joints. Over 50+ years, those joints degrade, develop tiny gaps, and — crucially — leak moisture and nutrients into the surrounding soil.

Tree roots are remarkably sensitive to water and nutrients. They don't randomly find their way into pipes — they actively seek out the moisture and nutrient-rich wastewater seeping from degraded joints. Once a root finds a joint, it grows through the gap and into the pipe, where it has access to a constant supply of water and nutrients. Over time, a root that started as a hair-thin thread becomes a thick mass that fills the pipe, catches debris, and blocks the flow completely.

Why Cutting Roots Isn't a Permanent Fix

The standard response to a root-blocked drain is to send a drain machine with cutting blades down the line to slice through the roots and restore flow. This works — temporarily. But the roots grow back. The joint that let them in is still there, still leaking, still inviting them back. Many Morwell homeowners find themselves calling a plumber to cut roots out of the same drain every year or two, sometimes more often. Each time, the roots are thicker and the pipe is more damaged.

The Permanent Fix: Pipe Relining

Pipe relining is the modern solution to the Morwell terracotta problem. Instead of digging up your garden, driveway and bathroom floor to replace the old terracotta, we insert a resin-impregnated liner inside the existing pipe. The liner is inflated against the pipe walls and cured in place, creating a seamless, joint-free new pipe inside the old one. With no joints, there's nothing for roots to find — the root intrusion problem is solved permanently, and the new liner comes with a 25–50 year warranty.

Relining is trenchless, which means your established garden, concrete driveway and bathroom floor all stay intact. It's usually cheaper than excavation once you factor in the cost of reinstating everything that would have to be dug up. And it's ideal for Morwell's older homes, where the sewer often runs directly under mature trees, paths and extensions.

What to Do If You Have Recurring Blockages

If your drains block up more than once a year, or you've had the same drain cut more than twice, it's time to stop treating the symptom and fix the cause. A CCTV drain inspection will show you exactly what's happening underground — where the roots are getting in, how badly the pipe is damaged, and whether relining is suitable. Book an inspection and find out once and for all what's going on under your Morwell home.