The system uses a twin fabric bag containing an expanding polyurethane resin foam, and is based on a technique which the company initially developed some 25 years ago for use in the gas distribution industry.
The major advantage of the DRAINBLOCK BAG™ is that it is positioned from an access point up to 15 metres away from the joint with the main. This avoids the need to excavate in the highway – a particular benefit at busy junctions and other sensitive locations.
DRAINBLOCK BAG™ prevents ground water from entering sewers, stops the passage of odour and discourages the movement of rats and other vermin. The entire lateral can be filled behind the bag, if required, thus avoiding unauthorised connection to clean water drainage systems.
DRAINBLOCK™ BAG starts to act as a seal against water and odours in approximately 30 minutes depending on the ambient temperature. A full cure will be achieved in 12 hours.
DRAINBLOCK™ BAG is designed for use on clay, concrete and plastic pipes up to and including 6”/150mm diameter. Available in kit form, it is ideal for use by Council contractors, water and sewerage companies, and facilities management and maintenance teams.
DRAINBLOCK™ BAG has been tested to resist a head of water up to 5 metres in height and is approved by WRc. It meets the requirements of The Drain Repair Book – 2nd Edition and the Civil Engineering Specification for the Water Industry – 6th Edition.