Case Study: 65m Pipe Reline Under a Carpark in Carnegie — No Excavation Required
- Christopher Unwin
- May 2
- 2 min read
Updated: May 3
The Problem
The owners of a small commercial property in Carnegie had been dealing with periodic stormwater overflow for two seasons. After heavy rain, water would pool near the rear of the carpark and take hours to clear. They'd had the drain jetted twice by other contractors — each time it improved temporarily, then returned. They called ATC Plumbing for a second opinion. We came out with the CCTV camera.
What the Camera Showed
The stormwater drain ran approximately 65 metres from the rear of the property to the street connection — the entire run passing under a sealed asphalt carpark. The CCTV revealed significant pipe degradation across roughly 40 metres: joint separations, partial collapses, and heavy root intrusion at three separate points. This pipe couldn't be simply jetted again and expected to perform. It needed structural repair.
The Options
Excavation of a 65-metre run under a sealed commercial carpark would have meant breaking up a large section of asphalt — significant cost, and the business would have needed to close parking for several days. We proposed CIPP pipe relining: inserting a resin-impregnated liner through the existing pipe, inflating it against the pipe wall, and curing it in place with UV light. No excavation, no asphalt damage, no business disruption beyond a single planned access point.
The Job
We completed the reline in two days. Access was through a single cleanout point at each end of the affected run. The carpark remained open throughout. The relined pipe carries a 35-year manufacturer warranty and is now root-resistant. The property owners saved considerably compared to full excavation and their business wasn't disrupted. Recurring drain problems or a drain that needs structural repair? Call ATC Plumbing on 1300 282 758.
Related Reading
How does pipe relining work? Is pipe relining worth it? How long does pipe relining last? See our pipe relining service at atcplumbing.com.au/services/pipe-relining.
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