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Steel roofing products are coated with either zinc (galvanized) or a mixture of aluminum and zinc (Galvalume or Zincalume).

Being more readily oxidizable than iron it produces, an electric state in the latter metal which protects ... The oxide upon a galvanized iron roof would of course be dissolved to a certain ...

The galvanized steel framework can be painted in a natural shade or varnished with a selection of different shades. The shelter roofing can be made of tinted glass or trapezoidal sheet metal with ...