Patch lining is a 'no dig technology'. It is usually cheaper and less disruptive to patch line a drain than renewing it, generally without the need to excavate. Patch lining can be used to repair isolated areas where the drain is difficult or impossible to excavate. I.E.UNDER BUILDINGS or DRIVEWAYS.
Patch lining is the perfect solution to STOP ROOT INGRESS and an ideal solution for fractured and displaced pipe work where water loss may be an issue.