Drain Lining

Why Lining?

Repairing drains can be problematic and expensive. Your drains can be buried under many feet of ground material, concrete, tarmac and brick walls, this means that a large excavation could be needed to even reach the point of repair. Excavations not only create a large mess but they increase the cost of repair exponentially. Before lining technology was invented, a crack or leaking drainage pipe was a major problem and you would have ended up turning your house into a temporary building site. Lining technology is the perfect solution for fractures cracks and leaks in your drainage system as a mostly no dig solution with minimal mess so your drains can be repaired faster and more effectively. Lining is a non-invasive way of repairing your drains, rather than digging up your property, access is gained from ground level and the repair takes place all from the nearest manhole to the defect.


Drain lining involves lining the inside of the drain with a polymer liner thar has been "wet out" and soaked into an resin solution made up of epoxy resin, accelerator and catylst. Basically liquid plastic, the resin is the main chemical base, the catylyst catylises the chemical reaction, and the accelerator accelerates the process as needed depending on the weather and temperature. The wet out liner is then wrapped round or pulled around (like a sock) an inflatable vessel or packer and pushed up the line to the location of the defect, there are multiple methods of doing this, and is inflated with a pump or compressor, as it is inflated to the diameter of the pipe it bonds to the original pipework. Lining only slightly reduces the diameter of the pipe by a few millimeters. After a period of time the liner hardens and creates a second pipe within the pipe reinforcing the structural integrity, once fully cured the packer/vessel is deflated and removed from the drain. We would then use our CCTV drain camera to review the quality of the install.

patch lining vs full length lining

Patch lining

Patch lining is a cheaper and somewhat easier version of lining where a packer is used and the liner is wrapped round and pushed up the line and inflated to install several meters of liner. We use patch liners for smaller repairs ie cracks and fractures or rodent entry solutions where redundant drain lines need to be sealed up.

Full length lining

Full length lining is a bit more complex wherein a lining vessel has the liner sock, calibration hose, turned inside out and the vessel inflates and blows out the sock inverting it as it comes out hence the name inversion lining. Full length liners are usually manhole to manhole or to the end of the run and they are thinner than a patch but are longer so potentially stronger but can be a bit more costly and are usually used for lining through a buried manhole or reinforcing a whole run that is cracked and/or rooted up to repair a longer section of pipe without replacing the whole thing.