How Geraldton's strong winds and salt air affect metal roofs, the warning signs of corrosion, and when painting helps.
Geraldton is one of the windiest places in Australia, and salt carried in from the ocean is hard on metal roofs. Regular checks and timely painting can add years to a roof.
Rust usually starts at screw heads, sheet laps, cut edges and around flashings. Salt sits in these spots and isn't washed off by rain, especially under eaves and overhangs.
Strong winds can loosen screws and lift flashings. Loose fixings let water in and allow sheets to move, which wears the paint around them. Check after big blows.
Before painting, rust must be treated, failed screws replaced and the roof cleaned of salt and chalky residue. A primer suited to metal goes on before the topcoats. See metal roof painting.
Painting is best done once the original finish has faded or chalked but before rust spreads. A roof that's still sound underneath usually only needs roof painting rather than a full replacement.
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