Metal roofing is durable, requires little maintenance, and is energy efficient. Some of the appeal of metal roofing is its availability in a variety of designs, styles and colors to complement any type of architecture. Furthermore, this type of roofing system is economical and attractive. The most common metal of choice for metal roofs is galvanized steel. This steel is coated with a layer of hot-dipped commercially pure galvalume steel. 

Galvalume steel combines the metallic coatings of both aluminum and zinc. Both galvanized steel and galvalume are coated with Kynar 500 or Hylar 5000 finishes protecting against corrosion for up to 20 years. Galvanized and galvalume steel are available in a variety of thicknesses ranging from 20 to 29 gauge steel, or .032 to .040 aluminum. Galvanized and galvalume steel metal roof systems carry a twenty year finish warranty with some manufacturer's offering 10 to 20 year weather-tight warranties.