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Galvanised steel roof

Hi , I am Mihir, a student from Griffith University and asking you for help on this situation because of a report that I need to write . I am doing Civil engineering.

Galvanised steel roof has minor stains and rust . What is the appropriate treatment ?
Why?

Patel Mihir N
Griffith University - gold coast, Queensland
2006

Good question, Patel. I think the answer is do nothing and just leave it be, but hunt for info about this at galvanizeit.org

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2006

If the stains are on old roofing, it is probably just where the galvanized layer has eventually sacrificed itself away totally, so you are back to unprotected steel. That's exactly what it is meant to do .Galvanizing does have the capability to a degree to protect adjoining bare metal like when you cut a piece of steel, the edge gets partially protected over time. Otherwise on new work, rust stains could be contamination of the zinc surface by rusty steel - as if a piece of rusty steel sat on a moist roof for a while, it would leave a rust mark.

Regards,

John Bransby
- Sydney, Australia
2006

adv.
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