Asbestos is an extremely dangerous material used by builders during most of the 1900s. Asbestos was a mineral used because its fibers are both heat resistant and durable. Though it is an excellent building material, asbestos causes cancer when its fibers are inhaled. Although asbestos was banned from any further use in any type of construction in 1987, many buildings still contain the hazardous material. Some roofing materials contain asbestos, and removing these types of roofs can be extremely dangerous. Large-scale asbestos roof removal should only be done by trained professional contractors.