Pipe relining has transformed how damaged drain and sewer pipes are repaired in Sydney. Before this technology became widely available, repairing a cracked sewer line typically meant excavating the garden or driveway to expose the pipe, which was expensive, disruptive, and slow. Pipe relining achieves the same result from inside the pipe — creating a structurally sound new pipe without breaking any ground.
Here is a clear, step-by-step explanation of exactly how pipe relining works, what materials are used, and what to expect if a licensed plumber recommends it for your Sydney property.
Step 1: CCTV Camera Inspection
Every pipe relining job begins with a thorough CCTV camera inspection of the affected drain or sewer line. This is not optional — it is essential. The camera reveals the exact condition of the pipe: the location and length of cracks, the extent of root intrusion, the position of offset joints, and whether any sections are too severely damaged or collapsed to accept a liner.
The inspection also confirms the pipe’s internal diameter and gradient, both of which affect the liner specification and installation method. A licensed blocked drain plumber in Sydney uses the camera footage to design the relining scope before any materials are ordered or installed. If the camera reveals a section of pipe that is unsuitable for relining, the plumber will recommend targeted excavation for that section before relining the remainder. Related: Why Does My Drain Keep Blocking After It Has Been Cleared?
Step 2: Pipe Cleaning and Preparation
Before the liner is installed, the pipe must be thoroughly cleaned. High-pressure hydro jetting is used to remove all root material, scale, grease deposits, debris, and any loose pipe material from the interior of the pipe. The liner must bond directly to the pipe wall to function correctly — any contamination on the wall surface can prevent proper adhesion and compromise the integrity of the finished liner.
Root cutting using a specialist head on an electric eel is carried out first if significant root intrusion is present, followed by hydro jetting to flush all material through the system. A final camera pass confirms the pipe is clean and ready to accept the liner.
Step 3: Liner Measurement and Preparation
The liner is cut to the precise length required to cover the full extent of the section being relined. Liners are typically made from a felt or fibreglass-reinforced tube that is saturated with a two-part epoxy resin. The resin remains workable for a limited time after mixing, so liner preparation and installation are carefully timed. A licensed Sydney plumber experienced in relining works efficiently to ensure the liner is installed correctly within the resin’s working window.
Step 4: Liner Installation and Inflation
The resin-saturated liner is introduced into the pipe through an existing access point — a manhole, inspection opening, or cleanout — and pulled or pushed into position to cover the damaged section. A calibration tube (inflation bladder) is inserted inside the liner and inflated using air pressure. The inflation presses the resin-saturated liner firmly and evenly against the inside of the host pipe wall, conforming to the pipe’s shape including bends and junctions.
The liner must be held under pressure during the curing stage to ensure it maintains full contact with the pipe wall and does not sag or deform. See also: 7 Plumbing Emergencies That Cannot Wait.
Step 5: Curing the Resin
The epoxy resin is cured into its final hardened state using one of three methods depending on the system in use: ambient temperature curing (which takes several hours), hot water curing (which accelerates the process using hot water pumped through the bladder), or UV light curing (which uses ultraviolet light pulled through the liner on a UV train, completing the cure very rapidly).
UV curing is increasingly preferred for residential and commercial jobs because it produces a consistent cure very quickly, reducing the time the pipe is out of service. Once the resin has fully cured, the calibration bladder is deflated and removed, leaving the finished liner in place as a smooth, jointless new pipe inside the original host pipe. A licensed commercial plumber in Sydney will confirm the curing is complete before removing equipment. Related: How Much Does Emergency Plumbing Cost in Sydney?
Step 6: Final CCTV Inspection and Verification
Once the liner is cured and the calibration bladder is removed, a final CCTV camera inspection is carried out to verify that the liner has bonded correctly to the pipe wall, that there are no voids or delamination, and that the finished internal diameter of the relined pipe is correct. Flow is tested to confirm the pipe is draining correctly. The property owner receives confirmation that the job is complete and the pipe is now sealed, structurally sound, and ready for normal use.
If You Need Pipe Relining in Sydney, Call 1300 071 280
All Day Plumbing carries out professional CCTV inspection and pipe relining across Sydney for residential and commercial properties. If you need help with damaged or cracked pipes in Sydney, call us on 1300 071 280. We provide upfront pricing, same-day inspections, and professional pipe relining that repairs your drain system without excavation.