Kirriemuir DSR

THE PROJECT

Kirriemuir DSR (Distribution Service Reservoir) is located close to Backwater Reservoir in a relatively remote area of northwest Angus, Scotland. The reservoir supplies the populations of Angus, Dundee, parts of Perth and Kinross with drinking water. The DSR is essentially a large water tank with an exposed roof which is vulnerable to erosion and wet weather damage. It is one of many DSRs in Scotland managed by Scottish Water. Morrison Construction appointed the Fraser Bruce Group as a specialist installation contractor to deliver the refurbishment of several Scottish Water tanks as part of a five-year framework involving civil engineering works. The Fraser Bruce Group have had an excellent working relationship with Fosroc for well over 30 years, so they approached the team at Fosroc to provide a selection of waterproofing solutions for different applications across the framework. They were looking for a robust yet flexible waterproof coating that would maintain its integrity for at least 20 years.

THE SOLUTION

Fosroc specified their most robust deck waterproofing system Nitodek FS System 3, with an additional topcoat for extra robustness against the effects of weathering. Nitodek FS is UV and slip resistant, and comes with the quality assurance of a 20-year warranty. It is also seamless, eliminating the risk of ingress through failed lap joints. For this application, the existing failed waterproofing system needed to be mechanically removed prior to the mechanical preparation of the concrete deck, after which the Nitodek FS system was applied. Once the existing system was removed, it was apparent that extensive concrete repairs would be required to both the perimeter upstand and the access hatch upstands. Spalling, delamination and blistering could be seen on various areas of the surface. Repairs to these areas and the 45⁰ fillets where horizontal meets vertical, were carried out using Renderoc GP. Once cured, the deck waterproofing phase using Nitodek FS was undertaken.

THE BENEFITS

By using the fast setting, liquid applied Nitodek FS for the tank waterproofing system, the Fraser Bruce Group were able to take advantage of the 60-minute cure time to quickly apply the primer, fleece reinforced membrane and topcoat. This kept project costs to a minimum for the client, while the ability of Nitodek FS to bond to itself gave the additional flexibility of enabling the work to be completed in two stages, several weeks apart, with no risk of failure at the point where the two application areas met.