A-Lert Roof Systems has earned a reputation as one of the leading metal roofing contractors in the United States. With over 35 million square feet installed for over 2,500 clients, we are by far one of the most experienced as well. A-Lert Building Systems is a general contractor and a single-source designer, supplier, manufacturer, and installer for all types of self-storage. We provide pre-engineered metal buildings, ranging in scope from small workshops to large commercial buildings. Through A-Lert Component Sales, we manufacture and supply structural framing, wall and roof panels, and trim and accessories for metal construction projects.