It is estimated by the U.S. Environmental Protection Agency (EPA) that most schools built before the mid 1980’s were constructed with asbestos-containing materials (ACM’s). Until the use of asbestos became regulated, it was often added to floor and ceiling tiles, wall panels, pipes, roofing materials, and many types of insulation. When asbestos-containing materials are disturbed or deteriorated, the chances of asbestos fibers being released and creating a health hazard greatly increase. Asbestos is most dangerous when in “friable” condition, meaning it is dry and can be crumbled to dust by hand.