Your image of a metal roof might still be some rusted-out corrugated steel on top of an abandoned barn. That was true at one point: steel has always had one natural enemy. The days of fighting rust and water, though, are mostly over, as technology has improved dramatically. Manufacturers began to coat the roofs with materials to create resistance to the elements and core oxidation. (Some custom roofs allow for aesthetic rusting but still retains its integrity.)
Currently, the most popular metal roofing materials are versions of steel, aluminum and copper. All provide durability, resistance to the elements (although some metals are more resistant than others), long life and low maintenance. In this modern age, other features of metal roofs include shielding from radio frequency and environmental sustainability.
Aluminum roofs are naturally rust-free and lightweight but are more susceptible to hail than steel. Denver roofers don’t use a lot of aluminum because of that. They’re also slightly more expensive than steel. Steel and copper roofs are protected with a coating specific to the metal to prevent rust. Several different types of coatings are used on metal panels to prevent rust, provide waterproofing, or reflect heat. They are made of various materials such as epoxy and ceramic. Ceramic coatings can be applied on metal roof materials to add heat-reflective properties.