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Strong gusting winds then contributed to the rapid and significant fire spread across the roof.
But the subcontracting company which supplied the waterproof roofing membrane called for FENZ to withdraw its report.
MPM Waterproofing, a subcontractor to Fletcher Construction, strongly rejected findings. The Onehunga-based business supplied the materials which were being applied on October 22 when the fire broke out. It also worked with a subcontractor to supply the staff to install the membrane.
MPM Waterproofing had reviewed the report "and believe it contains a considerable number of factual inaccuracies. As with the initial suggestions as to the cause of the fire already referred to, MPM Waterproofing has voiced its concern to FENZ about the content of the report and the accuracy of the conclusions made in it," it said.
Ron Devlin, FENZ region chief, said that MPM's concerns were raised during the investigation.
"We believe they've been appropriately considered, along with all the other relevant evidence and commentary," he said, adding that the findings were independently reviewed before release. Other parties were free to express their views about the cause and origin of the fire, but Devlin said FENZ was confident about its conclusions.
Fletcher Construction chief executive Peter Reidy and SkyCity Entertainment Group chief executive Graeme Stephens thanked FENZ for the report.
"Our own investigators have come to a similar conclusion to FENZ, that the source of the fire was the inadvertent ignition of the cardboard centre of a roll of waterproofing membrane. We are pleased that the origin and cause of the fire has been determined and that FENZ confirms that the fire was accidental," Reidy said.
Stephens said SkyCity was reviewing the report.