Asbestos is a naturally occurring mineral that was widely used in building materials such as insulation, flooring, and roofing. Its fibrous nature and resistance to heat and chemicals made it a popular choice for construction until it was discovered that asbestos causes serious respiratory diseases including mesothelioma, lung cancer, and asbestosis. Asbestos was banned in the UK in 1999, but properties built prior to this year may contain asbestos.