The two most common choices for a metal roof are corrugated metal and standing seam. Standing seam roofs are generally made from thicker grades of steel than corrugated steel roofs. While many corrugated steel roofs are made using a very thin 29 gauge steel, a minimum of 26 gauge galvalume steel is used for manufacturing of standing seam panels. A 24, and 22 gauge steel can also be used for residential and commercial styles. A metal coil from which standing seam panels are manufactured is usually factory painted with a high-end Kynar 500 paint finish. Corrugated metal roofs are often painted with cheaper acrylic paints. Both styles are available in a rainbow of popular colors, much more than asphalt shingles. The clean lines and unexposed fasteners of a standing seam roof are considered more attractive and earn the bulk of the residential trade. Metal roofs are almost, but not quite, maintenance free with corrugated roofs requiring a bit more attention to tend to exposed fasteners.