Non-Dig Drain Repairs

At Grey-Water Drainage we use the latest equipment and methodology to offer our clients an innovative method of repairing your broken drains without the need to dig up your driveway, carpark, patio or garden. Grey-Water offer a full drain repair service to residential & commercial customers across Medway, Kent, London & The South East. Following a full CCTV survey, Grey-Water are able to determine the cause of your broken drain, whether it be general day to day wear&tear or a more serious root ingress problem.


Grey-Water Drainage Resin lining

 Grey-Water Drainage are experts in the use of Non-dig drain repairs bythe use of high-end resin Lining. By using this latest technology,Grey-Water can carry out a repair by installing a lining inside the existing drain which bonds to the inside of the pipe, thereby creating a “pipe within a pipe”. This system offers a cost-effective alternative to carrying out expensive and disruptive excavations required to carry out a conventional repair, particularly when excavations would disturb an expensive paved surface or structure that is directly above the defective drain.

Resin liners are generally installed in a continuous length between two existing manholes, but they can also be used for most small patch repairs to single joints, displaced joints and fractures, or simply to re-line existing drains to give excellent resistance to root ingress, improved flowand the knowledge of future integrity. Different types of liner are available for use with straight or curved pipes. Our liner is impregnated with resin and then inserted into the defective or damaged drain from ground level. A secondary inflation tube is installed to inflate the liner to the outer diameter of the pipe. Once the resin has cured, using ambient temperature or hot water, the inflation tube is removed to leaving a smooth and “ready for use” liner with any flow issues.


Grey-Water Drain Patch Repair

 At Grey-Water Drainage we often find it will not be necessary to fully re-line a defective drain. Conducting a more localised repair or patching is an effective method for carrying out “on the spot” repairs. The process is similar to that mentioned above of re-lining, but instead utilises a short liner within a specific area of the drain to repair cracks or a displaced joint. Patching can be installed at any location within an existing drain without the more expensive cost of a full re-line.

A resin is used to impregnate a fibreglass mat, which is then pre-wrapped around an inflation device which we at Grey-Water call a packer. The packer is pushed or pulled to the defective area and inflated. The packer presses the patch against the wall of the pipe which is then left to cure, typically for 90-120 minutes depending on the ambient temperature. After curing, the packer is deflated and removed and the patch is inspected using CCTV before the repaired pipe is recommissioned for use.

Patching has a number of advantages over intrusive repairs via excavations: multiple patches can be installed in a similar time to a single excavation; there is no mess or need for expensive reinstatement; the patch seals against root ingress; and patches can be installed in radius sections and bends.

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