Metal roof installation requires the expertise of an experienced commercial roofing contractor. Metal roofing is especially sensitive to thermal expansion. And being a complex system metal roof, it requires careful craftsmanship. The design feature in the standing seam roof limits the water infiltration that can destroy other commercial options, both metal and otherwise. Standing seam roofs are very well regarded in the commercial roofing industry as the standard metal roof type for very large projects. While this roof generally has a long life expectancy, there are several weaknesses that can allow water penetration to sabotage that. One of the weaknesses of this metal roof style is that it is built of uncoated metal panels. Over years of being exposed to the weather elements, the metal panels that make up the roof can begin to rust and pit, a process that is exacerbated by acid rain. One downside of this type of metal roof is that it is the most tedious and, thus, generally costly.