Which materials are considered ACM in class II works?

Materials classified as Asbestos Containing Materials (ACM) in Class II works specifically include floor tiles and wallboard containing asbestos. Class II work is defined in asbestos regulations and primarily involves the removal of materials that contain asbestos but are not thermal insulation.

Floor tiles can often contain asbestos, especially in buildings constructed before the 1980s. Similarly, wallboard, including certain types of drywall and plaster products, may also contain asbestos fibers as a binding agent. This identification is crucial because improper handling of these materials can lead to significant health risks due to airborne asbestos fibers.

The other materials mentioned in the options refer to specific categories that may not fall under the Class II definition. For instance, only asbestos roofing materials and surfacing materials (which usually refer to plaster and other applied finishes) do not encompass the range of materials classified in Class II. Thermal insulation, meanwhile, is part of Class I work, which involves more stringent removal procedures due to the higher risk associated with thermal insulation products. Hence, recognizing the specific applications and classifications helps ensure proper safety measures in dealing with ACMs in various contexts.