Class III Work

Employers must use wet methods and local exhaust ventilation, to the extent feasible, during Class III work. When drilling, cutting, abrading, sanding, chipping, breaking, or sawing of asbestos-containing thermal system insulation or surfacing materials occurs, employers must use impermeable drop cloths as well as mini-enclosures, glove bag systems, or other effective isolation methods and ensure that workers wear respirators. If the material is not thermal system insulation or surfacing material and a negative exposure assessment has not been produced or monitoring shows the permissible exposure limit is exceeded, employers must contain the area with impermeable drop cloths and plastic barriers or other isolation methods and ensure that employees wear respirators (see also respirator requirements elsewhere in this training). In addition, the competent person must inspect often enough to assess changing conditions and upon employee request.

To learn more about Construction Asbestos Safety visit our Construction Asbestos Safety Online Training web page.