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There are certain treatments and grades of metal which are more corrosion resistant than others. Additionally, rust-resistant metals like aluminum and copper could be considered.
However, due to the variety of available products, there is no "answer" to your question. Rust even depends upon the particular design of product you choose.
Metal Construction Association has developed a Certification program which sets fairly high standards for the base metals used in metal roofing. Looking for a product which meets those standards would be wise.
As far as warranty -- that would have to be looked at on a product by product and manufacturer by manufacturer basis.
9/10/2004
9/10/2004