Metal roof provides increased wind resistance when compared to other roofing materials. This is because metal roofing systems use interlocking panels. The disadvantages of metal roofs include the noise created from rain hitting the roof, and, in snowy areas, the tendency of snow to easily fall off the roof and onto pedestrians or property. Originally, metal roofs were made of corrugated galvanized steel: a wrought iron–steel sheet was coated with zinc and then roll-formed into corrugated sheets. Another approach is to blend zinc, aluminum, and silicon-coated steel. These products are sold under various trade names like "Zincalume" or "Galvalume". The surface may
Rouge Steel it had agreed to purchase Severstal's Dearborn steel-making assets for $700 million cash. The acquisition would also include a coke-making facility and interests in three joint ventures that process flat-rolled steel products. Severstal also announced at that time that it would sell a separate steel-making facility in Columbus, Mississippi to Steel Dynamics for $1.63 billion. Severstal Dearborn produces flat-rolled products, including hot rolled band and hot rolled processed sheet, cold rolled sheet, hot dipped galvanized sheet, electro galvanized sheet, and aluminum coated boron and other advanced steels. Severstal Dearborn’s 68 in. hot strip mill has an annual throughput of 3.8