Why terracotta fails
Terracotta was the standard sewer lateral material for decades of Latrobe Valley housing — the weatherboard near the Traralgon CBD and the SEC-era stock in Morwell both run it. Terracotta is a ceramic pipe laid in short lengths, joined with a mortar or rubber ring at each joint. Over decades the ground moves, the joints open, and tree roots — which seek moisture and nutrients — find the gap and grow into the line. Once inside, a root spreads, catches solids, and slowly closes the pipe.
The failure is not the pipe wall; it is the joints. A sound terracotta pipe with open joints will block again and again no matter how well you jet it, because the roots come back through the same gaps. That is the difference between a drain that blocks once (clear and go) and a drain that blocks twice a year (structural problem).
How we clear it
We clear with a water jetter and a root-cutting nozzle, not just an electric eel. An eel punches a hole through the root mass; a jetter cuts the roots out and flushes the line, so the drain runs properly rather than through a channel that closes over in a month. We match the jetter pressure to the pipe — terracotta will crack under too much pressure, so we use the right nozzle and the right pressure for the material.
When CCTV changes the answer
If a drain has blocked twice in a year, jetting alone is not the answer — there is a structural problem downstream. We run a CCTV camera, find the open joint or the root ball, locate it from above ground with a sonde, and show you the footage. Then the decision is honest: a localised dig-up and repair at the fault, a patch liner for a short broken section, or a full line replacement if the whole run is gone. We do not recommend a full line replacement to fix one root ball.
Repair vs replacement
A localised repair — digging up the faulted section, replacing it in PVC, and rejoining to the sound terracotta — is the right spend when the rest of the line is in good condition on camera. A full replacement in PVC is the right spend when the camera shows the whole run is open-jointed and root-invaded. The price difference is large, so we show you the footage and let you decide with the evidence in front of you.
The trees
The big eucalypts on small Traralgon and Morwell blocks are the worst offenders — their roots travel further than people expect and they seek the moisture in a sewer line aggressively. If you are planting near a sewer line, keep the big trees well clear, and if you are buying an older home, a pre-purchase CCTV inspection of the lateral is one of the best few hundred dollars you can spend.