I got a metal roof that is galvalume I am told (5V). The open roof areas are clean of rust after 20 years. Now some of the peak is rusted solid. Roofer tells me some of peak is galvanized only and some galvalume.
Also have rusting on the good flat sloped surface of galvalume. That's due to solar panel aluminum frames. Rain drops carry aluminum oxide from the frame and THAT will rust the good galvalume sheets.
Cannot believe that was allowed 11 years ago.
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