183-185 Clarence Street is a redevelopment and restoration project for two adjoining heritage listed buildings, a former electricity substation and a disused office and warehouse building, in Sydney’s central business district. Built Pty Ltd is leading the commercial and retail redevelopment supported by FJMT Architects.
During the early onsite works, an unexpected finding of suspect material identified asbestos malthoid (a type of asbestos with a bituminous membrane) under the roof cladding in the 185 Clarence Street building. Over time the malthoid had deteriorated into friable asbestos presenting a health risk during construction and limited Built’s ability to install a tower crane for the erection of additional building structures on top of the old roof. Therefore, Built engaged McMahon Services to undertake asbestos remediation works in the roof.
Initial works were the erection of scaffolding and the full encapsulation of the roof. Three negative air units were installed and operated on a continuous basis to ensure all air and dust particles remained with the encapsulated bubble during asbestos remediation works. A three-stage shower decontamination and waste water management unit was utilised for asbestos technician decontamination and water filtration.
Over 20t of friable and non-friable asbestos malthoid containing materials were removed, double wrapped in 200µm plastic or in 205L drums and disposed offsite at licenced Environmental Protection Agency (EPA) waste receiving facilities.
Works were completed four days ahead of schedule and without incident. All asbestos present in the roofing area was safely removed, allowing for the safe installation of the tower crane.