Roofs are essential parts of a building. However, you have to be cautious since in the 1990s, asbestos-containing materials (ACMs) are used widely on the roof of commercial, residential and industrial properties.Your old contaminated roof will not cause danger as long as it’s left untouched. The problem is that with time, the top layer of the sheet may break down and generates fibres. Asbestos fibres are dangerous especially if you keep inhaling them.