Standing seam metal roofs are the best choice for crystalline PV and thin film solar panels because, unlike other materials, metal offers the longest service life. When installing a crystalline system that typically is warranted for 25 years of power generation, a building owner is going to benefit from a roofing substrate that has a greater life expectancy than that of the solar panels. Standing-seam panels also provide a natural platform for attaching crystalline systems without any roof penetrations. Additionally, highly reflective roofs help keep rooftop temperatures cool, resulting in better performance from solar panels.