Which activity is encompassed in class IV works?

Class IV works specifically relate to maintenance activities that do not disturb asbestos-containing materials (ACM). In the context of asbestos management, this classification covers a range of routine operations where there is a potential for incidental disturbance of materials containing asbestos, but such disturbance is intentionally avoided.

This classification is crucial because it acknowledges the presence of asbestos without performing any activities that would put workers at risk through disturbance. For instance, a facility might require general maintenance such as plumbing or electrical work while ensuring that any surrounding ACM remains undisturbed. Thus, understanding the boundaries and safe practices associated with Class IV work aids workers in recognizing their responsibilities in preventing asbestos exposure.

On the other hand, the other activities listed involve some form of direct interaction with ACM. For example, the removal of non-friable ACM and working with thermal system insulation (TSI) and surfacing ACM both require more extensive safety precautions and protocols due to the direct handling of materials known to contain asbestos. Asbestos waste disposal operations also fall outside of Class IV since they deal with the removal and management of potentially hazardous materials rather than simply avoiding disturbance.