Metal
Metal panels are generally considered architectural or structural. Architectural metal panel roof systems are w`ater shedding and must be used on steep slope roofs with a solid substrate, while structural metal panel systems can be used in low slope or steep slope applications. Most structural metal panels are applied over spaced structural supports without being supported by a solid substrate. There are many seam designs and attachment methods with both types of metal panel systems. Warranties for metal roofing systems range from finish warranties to long term leak free warranties