Hangzhou Tedun Building Material Co. Ltd is a professional corporation specializing in providing services for the metal roofing industry. Its mission is to add value to commercial, industrial, government, or institutional metal roofing projects, either proposed or existing, by providing engineering, plans and specifications, contractor consultation, forensic investigations, and/or witness services that will yield a metal roof product that satisfies all codes, regulations, and industry standards, as well as provides a satisfactory roof product to the building owner.