How many classes of asbestos work are defined under Cal OSHA 29 CFR 1926.1101?

• A. Class 1, Class 2, Class 3, and Class 4
• B. Class A, Class B, Class C, Class D
• C. Class I, Class II, Class III, Class IV
• D. Class Alpha, Class Beta, Class Gamma, Class Delta

Answer: (A)

Four classes of asbestos work are defined to categorize tasks by how likely they are to release asbestos fibers and what controls are needed. The classifications are based on the potential for fiber release and the type of work performed.

Class I covers work removing friable asbestos-containing materials—materials that can crumble or release fibers easily, such as certain insulation or sprayed-on coatings. This type generally involves the highest exposure and the most stringent controls.

Class II involves removal of nonfriable asbestos-containing materials that could become friable if disturbed during removal, like vinyl asbestos floor tiles or roofing materials. While these materials aren’t easily broken apart, disturbing them still poses a risk of fiber release during handling.

Class III includes repair and maintenance operations where asbestos-containing materials are likely to be disturbed, such as making connections or replacing components in systems that contain asbestos.

Class IV refers to custodial or housekeeping activities where workers may be exposed to asbestos-containing materials as a result of normal operations, but no removal is performed. This covers cleanup and routine maintenance tasks that could involve incidental exposure.

So, there are four distinct classes, commonly referred to as Class I through IV (or 1–4, depending on formatting). The key idea is that the four classifications guide the required controls and procedures for each type of asbestos-related work.