Asbestos is a naturally occurring mineral fiber that has been used in more than 3,000 different construction materials and manufactured products. It is commonly found in heating system insulation, decorative spray-on ceiling treatments, vinyl flooring, cement shake siding, and a variety of additional materials. Some asbestos-containing materials were still being installed in the late 1980s.
The asbestos content of different materials varies according to the product and how it is used. Materials containing higher concentrations of asbestos include insulating products on heating systems and the backing on sheet vinyl flooring.