Chromadek sheets are pre-painted, galvanized roof sheets.
Chromadek is not recommended for use within 5km of salt marine influence.
The sheets in the photo were taken from Atlantic Beach Estate in Melkbos and they are just over 10 years old.
When the sheets begin to perforate at the ends of the sheets, then they will need to be replaced.
It would be possible to use a ‘slip sheet’ iow cut but the rusted section and insert a piece of new sheet, but this is not recommended as it will only be delaying the replacement by a few years.
Colorbond Ultra is the preferred material for use in such environments.