Community Metal and Quality Built Mini Barns. We offer top quality steel and the accessories for residential, commercial and agriculture construction..Welcome to Metal Sales Manufacturing Corporation the nation’s largest manufacturer of metal roofing, wall and building systems. Founded in , Metal Sales operates manufacturing facilities in locations throughout the United States and Alaska..Learn all about Metal Roofing Prices and more!.ABOUT US. DML USA Metal Roofing is one of the leading manufacturers of metal roofing in the state of Illinois. Founded in , it has been manufacturing high quality and affordable roofing products that have received nation wide interest and appreciation..