GOWRIEHILL DISTRIBUTION SERVICE RESERVOIR

Gowriehill Distribution Service Reservoir is located in Dundee City and managed by Scottish Water. In late 2021, part of the reservoir tank construction was discovered to have a brittle asphalt waterproofing layer over the top of a beam and block roof. Scottish Water commissioned Mackenzie Construction, who in turn commissioned specialist contractor Fraser Bruce Group to resolve the issue.

Fraser Bruce Group have a long- standing relationship with Fosroc, having worked together for nearly 40 years on a variety of concrete repair and waterproofing projects. The key requirement for this project was to find a suitable solution that would stand the test of time, so only a solution offering a 20-year warranty would be considered in the specification.

THE SOLUTION
An initial site inspection was carried out to establish the current condition of the roof, followed by consultation with Fosroc’s National Waterproofing and Technical teams to find the correct solution. The specification that followed was subject to adhesion tests which were carried out on site the following week. Following mechanical preparation of the deck and all the joints the following solution was proposed. Nitoseal MS600 was to be applied to all the joints between the precast slabs, to prevent the passage of water or water vapour from the tank below. Proofex Engage Detail Strip was then applied across the joints, prior to the application of Proofex 3000 self-adhesive membrane across the entire roof. Proofex Sheetdrain 80 was placed on top of the Proofex 3000 prior to reinstating the overburden.

THE BENEFITS
By sealing each of the joints in the beam and block roof, the passage of water vapor could be prevented and the application of the detail strip over the joints allowed for any differential movement, should there be any. Following the sealing, the Proofex 3000 applied across the whole roof and joints gave a waterproof solution prior to the application of Proofex Sheetdrain 80.

The proposed Fosroc solution was easy to apply and provided a robust watertight finish that will last for decades. The contractor and client were so impressed by the results in fact, that the solution has now also been proposed for use in other similar applications with Scottish Water.

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Michael McDonnell Managing  Editor of Irish Construction Industry Magazine & Plan Magazine

Email: michael@irishconstruction.com      WWW.MCDMEDIA.IE  WWW.IRISHCONSTRUCTION.COM