In the late 1940s, two companies started a new construction-related industry. It was a manufacturing business that designed and manufactured steel structural systems and related covering components to provide a pre-engineered metal building. The new pre-engineered buildings offered the advantages of standard building details, standard framing systems, and light gauge metal roof and wall panels. Today, metal building products are well established. In particular, metal roofing provides a solution to problems with flat roofs. But metal roofs were not always a standalone product.