Australian standards and Code requirements we work to, with the source for each.
Sheet metal roof and wall cladding in Australia is installed to AS/NZS 1562.1. It sets the minimum pitch, the fastening pattern and the side and end laps for each profile. Work that departs from it is what an insurer points at after a storm claim.
CUSTOM ORB corrugated profile is rated down to a minimum roof pitch of 5 degrees. Laid flatter than that, water sits in the pans instead of running off and the sheet holds moisture against the fasteners, no matter how well it is screwed down.
KLIP-LOK concealed-fix sheeting can be installed to a pitch as low as 1 degree in 0.48 mm base metal thickness, meeting AS/NZS 1562.1:2018. That is the usual answer for a flat rear extension where corrugated sheet would not comply.
Last updated: 8 October 2026
Roof repair in the Northern Beaches has its own rules: heritage areas, salt air and tight access all change how the job is done. Everything below links to the council or standard it comes from, so you can check it yourself.
That east coast low dropped 226.6mm on Sydney in three days with gusts to 98km/h, and the Bureau records severe coastal erosion at Collaroy. Flashings, fixings and gutter capacity around here are judged against that event.
Source: Bureau of Meteorology, Sydney June 2016In the Manly town centre and Pittwater Road conservation areas, roof alterations must retain the original form and pitch and keep original cladding including slate. Swapping slate or terracotta for profiled metal is a development application, not a like for like repair.
Source: Manly DCP 2013, clause 3.2.2Collaroy-Narrabeen, Bilgola and Basin Beach at Mona Vale are formally classified by the NSW Government as coastal erosion hotspots, and council maintains emergency action sub plans for each. Homes on those strips take the most direct wind-driven salt and storm loading in the area.
Source: Northern Beaches Council, erosionNoise from power tools must not be audible inside a neighbours habitable room between 8pm and 7am Monday to Saturday, or 8pm and 8am on Sundays and public holidays. That sets the earliest a crew can start saws and nail guns on your street.
Source: Northern Beaches Council, noise pollutionBlueScope names Manly Beach as its metropolitan example of a surf marine environment, the harshest of its three salt classes under AS 4312. Wind, shelter and areas the rain never washes push the real corrosivity higher still, which is why the steel grade used here is not the one used inland.
Source: BlueScope Technical Bulletin TB-35 and AS 4312:2019We cover Manly, Fairlight, Freshwater, Curl Curl, Dee Why, Collaroy, Narrabeen, Warriewood, Mona Vale, Newport, Bilgola, Avalon, Whale Beach, Palm Beach, Frenchs Forest, Belrose, Terrey Hills, Forestville, Killarney Heights, Balgowlah, Seaforth, Brookvale, Cromer, Elanora Heights, Bayview and Church Point.
Terrey Hills, on the Northern Beaches, averages 1,216mm of rain a year, close to central Sydney, but with a sharper autumn peak of 175mm in March alone. The June 2016 east coast low dropped 226.6mm on Sydney in three days with gusts to 98km/h, and flashings, fixings and gutter capacity here are judged against that storm.
For any change to roof form or material in the Manly town centre and Pittwater Road conservation areas, yes. The Manly DCP requires roof alterations there to retain the original form and pitch and keep original cladding, including slate, so swapping slate or terracotta for profiled metal is a development application, not a like for like repair.
If the house is on Collaroy-Narrabeen, Bilgola or Basin Beach at Mona Vale, yes. The NSW Government classifies those three Northern Beaches beaches as coastal erosion hotspots, and homes on those strips take the most direct wind-driven salt and storm loading in the area.
Manly heritage areas keep the original roof form, bushfire buffers reach 100 metres and only 10 per cent of a canopy can be pruned…
Read the guideIf you live between Manly and Palm Beach, your gutters work harder than almost anywhere else in Sydney. Salt air corrodes metal…
Read the guide