Warriewood Zone Substation, Roofing and Associated Works, Project No. AG8734/17, Warriewood Zone Substation T.S.TW16500, Samuel Street, Mona Vale, NSW 2103
Warriewood Zone Substation is situated in Mona Vale and is part of the Ausgrid pole and wire network serving the homes and businesses of the Northern Beaches district of Sydney.
Ausgrid’s maintenance program required the replacement of the existing asbestos containing non-friable Galbestos roof with a new metal roof. Murphy’s were chosen by Ausgrid to perform this work, having the necessary asbestos removal licence, trained staff and experience in this type of project.
All Murphy’s personnel carrying out work in Ausgrid substations have the SC1200 substation entry training together with training in working safely at heights and asbestos removal. During the asbestos removal work, our asbestos removal trained staff used the appropriate PPE protection, including type 5 disposable coveralls, gloves and respiratory protection.
Trades used for the work included licenced scaffolders. As the substation was operational and live, the continuity of power supply to the local area was a critical consideration. Murphy’s protected the live switch gear by constructing bird cage scaffold protection over all vulnerable equipment beneath the roof replacement areas.
During the roofing works, falls from the edge of the more gently pitched part of the roof were prevented using perimeter hand rails. Falls through the roof space itself were controlled using safety harnesses and temporary static lines, with all personnel working on the roof trained in safe working at heights. For the steeper pitched part of the roof, works were undertaken using a scissor lift to provide safe access.
As it was crucial that the substation continued operating without interruption throughout the works, Murphy’s needed to keep the roof and building watertight. For every day of the roof replacement, weather forecasts were checked so that work was not carried out in wet conditions. The roof was completed in sections. Each day, Murphy’s management would plan the work ensuring the section of the roof removed would be replaced by the end of the shift, leaving the roof watertight each evening.
Approximately 300 square metres of Galbestos roofing was removed and replaced with 0.48BMT Shale Grey sheeting, complete with flashings. For future access for roof maintenance, a height safety system of anchor points was installed at the completion of the works.