Australian standards and Code requirements we work to, with the source for each.
Observatory Hill has averaged around 1,213 mm of rain a year on records kept since 1858. Everything on the roof, from panels and skylights to gutters, has to keep working through that volume of water and the grit it carries off the surface.
NSW work health and safety law requires a safe work method statement for construction work where a person could fall more than two metres. Single-storey gutter and roof work clears that line, which is why the job is planned, harnessed or edge-protected before anyone gets on the roof.
Source: SafeWork NSW, working at heights
SafeWork NSW reports that most serious and fatal falls happen from roofs, ladders and building edges at four metres or under, and a fall from two metres can kill. A single-storey Sydney house is squarely inside that range.
Source: SafeWork NSW, falls from heights
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