Many people have installed new roofs after 1989 and believe that asbestos is something they do not need to worry about. The problem for some building owners is that if they roofed over an existing roof, the existing roof (now bottom roof) could have asbestos in it. Asbestos has a history in roofing materials. It was not banned until 1989, so some roofs still have asbestos in them today. Asbestos in roofing can be found in the following areas: