Understanding what a CCTV drain inspection finds, and what the pipe looks like after relining, helps homeowners and property investors make informed decisions. Abstract descriptions of “root infiltration” and “pipe belly” mean more when you can picture what they actually look like and how the finished relining resolves them. This guide walks through the most common Central Coast inspection findings with before-and-after scenarios.
Quick answer (BLUF)
The most common pre-relining findings in Central Coast homes are: root infiltration at terracotta joints, joint displacement or offset, pipe belly (sagging low points), AC cement corrosion, and isolated pipe cracks. After relining, the post-CCTV inspection shows a smooth, uniform, joint-free bore with no root entry points and a fully documented pipe condition record. The contrast between the two sets of footage is often striking.
Scenario 1: Root infiltration at terracotta joints, Gosford
The property: A 1974 brick home in North Gosford. Recurring drain blockages, three callouts in two years, each cleared by jetting. The owner books a CCTV inspection after the third occurrence.
What the pre-lining camera found:
The camera travels 3 m along a clean 100 mm terracotta pipe and hits the first joint. At the 3 m joint, there is a root tail about 30 mm long entering from the 10 o’clock position. At the 5.5 m joint, a larger root mass partially fills the pipe bore, the recurring blockage point. At the 8 m and 11 m joints, two more root entries of varying size. Between the joints, the pipe barrel is in good condition, no cracks, no deformation.
The report recommends full-length relining of the 14 m sewer run from the house to the inspection shaft. The verdict: multiple joint entries with roots, but structurally sound pipe barrel between defects. Full relining is recommended over point repair because there are four active entry points along the run.
After relining:
The post-lining CCTV shows a smooth cream/brown epoxy surface, the cured liner inner face. There are no joints visible (the liner is continuous). Two lateral reinstatements are cleanly cut. The pipe run has a uniform bore with no obstructions. The barrel is smooth, curved and intact from end to end.
No recurring blockages in 3 years after relining.
Scenario 2: Pipe belly and silt accumulation, Avoca Beach
The property: A 1968 weatherboard home in Avoca Beach. Slow drainage in the kitchen sink. The bathroom drains fine. No blockage, just sluggish flow.
What the pre-lining camera found:
The camera travels normally through the first 8 m, then the view tilts, the camera is going downhill. A belly section. At 9.5 m, the lowest point of the belly is filled with a grey sandy-silt deposit to about 40% of the pipe height. Above the silt line, the pipe is clean terracotta. The camera pushes through and continues normally beyond 11 m to the inspection shaft.
The silt accumulation explains the slow kitchen drainage, every time water flushes through, it has to push through the partially silted belly point. The deposit is not a root mass or a grease blockage, it is sand and fine silt that has accumulated over years in the low point.
The report recommends: jet clearing to remove the silt deposit, then relining to stabilise the pipe run and prevent future silt accumulation (the smooth liner surface is less likely to retain silt than roughened terracotta).
After relining:
Post-lining CCTV shows the belly section still present as a geometry (the liner conforms to the host pipe shape) but the pipe interior is now smooth and clean. The silt deposit is gone. The liner has not corrected the belly, the gradient is still there, but the smooth surface dramatically reduces the accumulation rate.
Scenario 3: AC cement corrosion, Wyong estate
The property: A 1979 brick veneer home in a Wyong housing estate. Wet patch in the garden during dry weather. Property is 40 years old and has never had a drain inspection.
What the pre-lining camera found:
The camera enters a 100 mm pipe that appears dark grey, not the bright terracotta orange/red of clay. This is AC cement. The internal surface shows extensive pitting, small circular depressions across the entire pipe wall, some penetrating visibly deep. At 6 m, a section of the pipe wall has spalled, a chunk of the cement surface has broken away, leaving an exposed patch about 100 mm × 50 mm. At 12 m, two joints are open by approximately 5 mm.
The pipe is not blocked, the wet patch is explained by the open joints at 12 m allowing sewage to leach into the surrounding soil.
The report recommends full-length relining, the pipe wall corrosion is too extensive for point repairs, and the open joints are causing an active environmental contamination issue.
After relining:
Post-lining CCTV shows a uniform, smooth liner. The corroded AC cement surface is now completely encapsulated. The open joints are bridged. The wet patch in the garden stopped appearing within two weeks of the relining job.
Scenario 4: Isolated pipe crack, investment property, Woy Woy
The property: A 1985 investor-owned rental in Woy Woy. Pre-purchase inspection by the buyer, 100 mm sewer main, no reported drain problems.
What the pre-lining camera found:
The camera travels through clean PVC for the first 6 m, then transitions to terracotta at the property’s original boundary drain connection. At 9 m, a circumferential crack in the terracotta barrel, the pipe is cracked right around its circumference, one section slightly offset from the next. A few root tendrils are visible at the crack edges but no established root mass.
Beyond the crack, the pipe is sound to the inspection shaft at 15 m.
The report recommends: point repair at the 9 m crack section (a 600 mm patch liner), not full-length relining. The pipe is otherwise sound and new (PVC) in the first 6 m.
After point repair:
Post-repair CCTV shows the patch liner neatly seated over the crack location. The edges are sealed. No root entry visible. The crack is fully bridged.
What the comparison tells you
In each scenario, the comparison between pre- and post-lining CCTV footage is the definitive record. It shows:
- What defects existed before the job
- That the liner is correctly installed
- That lateral connections are reinstated
- That there are no new defects introduced during installation
This documentation is the foundation of the warranty. A contractor who does not provide post-lining footage is a contractor who cannot show you that the job was done right.
FAQs
How long does a pipe stay in the condition seen in the post-relining CCTV?
The cured liner is chemically stable and structurally sound under normal residential conditions. The smooth surface resists new root attachment. The only vulnerability points over time are the liner ends and lateral reinstatements, if these are correctly sealed, there is no degradation mechanism for the liner surface. The post-relining condition is expected to persist for the full liner warranty period.
Can I get a copy of the CCTV footage from my job?
Yes, insist on it. The pre- and post-lining footage should be provided on USB or as a digital download. This is your record of the job. Store it with the property documents.
What does a root infiltration look like on camera?
Small root tendrils look like white threads entering at a joint gap. Established root masses look like a brown or white tangle filling part of the pipe bore, similar in appearance to a hairy obstruction. Very advanced root infiltration can fill the entire visible pipe bore.
I was told my inspection was “normal.” What does that actually mean?
A “normal” inspection result for a pre-1980 terracotta pipe typically means the joints are reasonably tight, no root infiltration is visible, and there is no significant deformation or crack. It does not mean the pipe is perfect, it means it is in acceptable condition and does not require immediate relining.