Pipe relining can repair many types of underground pipe damage, including cracks, small fractures, leaking joints, tree root entry points and sections affected by corrosion or general deterioration. The process creates a new structural lining inside the existing pipe without extensive excavation. However, relining is not suitable for every problem. Completely collapsed, severely misaligned or extensively deformed pipes may require replacement. A CCTV drain inspection can determine the condition of the pipe and whether relining is an appropriate repair method. Pipe relining is commonly suitable for damaged pipes that still retain enough of their original shape to support a new internal liner. It can provide a practical alternative to digging up and replacing the entire pipe.
What Is Pipe Relining?
Pipe relining is a trenchless repair method used to restore damaged underground pipes from the inside. Rather than excavating the entire pipe, plumbers insert a specialised liner into the damaged section. The liner is positioned against the internal wall of the existing pipe and cured to create a strong new pipe within the original one. Because extensive excavation can often be avoided, relining can reduce disruption to gardens, driveways, paving and other areas above the damaged pipe.
Cracked Pipes
Cracking is one of the most common types of damage that may be suitable for pipe relining. Underground pipes can crack because of ground movement, ageing materials, external pressure or changing soil conditions. Small cracks may initially have little effect on drainage but can worsen over time and allow roots or groundwater to enter. Relining can seal these cracks and restore the integrity of the affected section without removing the original pipe.
Small Fractures and Breaks
Some fractured or partially broken pipes can also be repaired through relining. Provided the existing pipe remains sufficiently intact and has not completely collapsed, the liner can bridge damaged areas and create a continuous internal surface. A professional inspection is required to determine whether the remaining pipe structure is suitable for relining.
Leaking Pipe Joints
Older drainage systems often consist of individual pipe sections connected by joints. Over time, these joints may deteriorate, separate slightly or begin leaking. Damaged joints can allow wastewater to escape while also creating openings for groundwater, soil or tree roots to enter. Because pipe relining creates a continuous internal lining, it can seal compromised joints and reduce the likelihood of further leakage.
Tree Root Intrusion
Tree root intrusion is a common problem for underground drainage and sewer pipes. Roots are naturally attracted to moisture and may enter through tiny cracks or gaps around pipe joints. Once inside, they can continue growing and trap waste, leading to recurring blockages. Before relining, roots and other obstructions generally need to be removed so the pipe can be properly prepared. The new liner can then seal the original entry points, helping reduce the likelihood of roots penetrating the same damaged sections again. Learn more about how tree roots damage underground pipes.
Corroded or Deteriorating Pipes
Depending on the extent of deterioration and the original pipe material, some ageing or corroded pipes may be suitable for relining. Rather than replacing the entire underground line, relining creates a new internal surface that helps restore structural integrity and improve wastewater flow. However, severely deteriorated pipes need to be carefully assessed to ensure enough of the original structure remains for relining to be effective.
Minor Gaps and Joint Displacement
Small gaps or minor displacement between sections of pipe may sometimes be addressed through pipe relining. The liner can create a smooth internal pathway across minor imperfections, helping improve flow and seal vulnerable areas. Significant displacement is different. If sections of pipe have moved substantially out of alignment, excavation and physical replacement may be required.
Pipes Affected by Recurring Blockages
Recurring blockages do not automatically mean a pipe needs relining, but they can sometimes indicate underlying structural damage. Cracks, rough internal surfaces, damaged joints and root intrusion can repeatedly trap waste and debris. Clearing the blockage may restore flow temporarily without addressing the reason it keeps returning. A CCTV inspection can identify whether structural defects are contributing to recurring problems and whether relining could provide a longer-term solution.
When Pipe Relining May Not Be Suitable
Pipe relining is versatile, but it cannot repair every type of pipe failure. A pipe that has completely collapsed may no longer provide the pathway needed to install a liner. Severely crushed, significantly misaligned or extensively deformed sections may also require excavation and replacement. The correct repair method should always be based on the actual condition of the pipe rather than assuming relining is suitable for every drainage problem.
How CCTV Drain Inspections Determine Suitability
Before recommending pipe relining, plumbers can inspect the underground drainage system using CCTV equipment. A specialised camera is passed through the pipe to identify cracks, root intrusion, joint problems, deformation and collapsed sections. This allows the condition and location of the damage to be assessed without immediately excavating the area. The inspection helps determine whether relining, targeted replacement or another repair method is the most appropriate solution.
Why Pipe Preparation Matters
Successful pipe relining depends on properly preparing the existing pipe. Roots, grease, scale and other debris need to be removed so the liner can be installed correctly. Professional drain cleaning equipment may be used to restore the internal surface before relining begins. Careful preparation helps the new liner form correctly and supports reliable long-term performance.
The Benefits of Repairing Pipes From Within
One of the major advantages of pipe relining is the ability to repair underground pipes while minimising excavation. Traditional pipe replacement may require digging through lawns, gardens, driveways, pathways or other established areas to reach the damaged section. Relining can often avoid much of this disruption because the repair takes place from inside the pipe. This can reduce site disturbance, shorten the repair process and minimise the amount of restoration required afterwards. Learn more about how pipe relining helps preserve established gardens.