Comrie DSR

THE PROJECT

The village of Comrie is located towards the western edge of the Perth & Kinross Council area, approximately 40 kilometres west of Perth in Scotland. The waterproofing system used to cover the buried water tank at Comrie Distribution Service Reservoir (DSR) was many years old and had failed. As part of the ongoing Scottish Water SR21 framework, Fosroc and The Fraser Bruce Group have developed a wide range of solutions for waterproofing water tanks that have been proposed and agreed by both Morrison Construction and Scottish Water. This project involved removing the soil overburden and the existing waterproofing system, before mechanically preparing the deck and applying sheet membrane.

THE SOLUTION

Once the overburden and existing waterproofing were removed it was apparent that there was severe ponding on the tank roof. The decision was taken to prepare the deck and apply an external self-leveler to prevent the ponding of water. The perimeter and upstand detailing was carried out before Fosroc’s self-adhesive sheet membrane Proofex 3000 was applied to the primed, horizontal surface. The surface was then protected with Proofex Sheetdrain 80, a drainage and protection membrane. After the membrane was laid, the access hatch upstands received two coats of Nitocote CM210 before more Proofex 3000 was applied and terminated just below the height of the new overburden. The access hatches were then sealed in place with Nitoseal MS600.

THE BENEFITS

Proofex 3000 membrane, which is cold applied and comes in 1m x 20m rolls, is self-adhesive, thereby reducing the amount of product and application time. The applicator was able to cover large areas in far less time. The membrane is made from cross laminated HDPE film to protect against damage, while still being sufficiently flexible for detailing around corners. It is resistant to ground water, soluble sulfates and chlorides, offering robust protection from aggressive ground salts. Its use with Sheetdrain achieved a high quality, reliable installation compliant with EN 13707:2004. By combining the use of Nitocote CM210 and Proofex 3000, Fosroc were able to provide solutions for both exposed and buried areas of the tank with no compatibility issues between the products.