Corrosion protection is a specialized area of knowledge for a metal roof contractor. They must understand the difference between galvanized steel (zinc coating), Galvalume (zinc and aluminum coating), and pure aluminum or copper. They advise on the best material for coastal environments, where salt spray accelerates corrosion, often recommending aluminum or Galvalume over standard gal... https://kkroofspecialist.com.sg/metal-roof-contractor/