What are the four classes of asbestos work?

The Occupational Safety and Health Administration (OSHA) standard for asbestos specifies four classes of asbestos activities. These are:

"Class I" asbestos work means activities involving the removal of thermal system insulation (TSI) and sprayed-on or troweled-on or otherwise applied surfacing ACM or PACM.

"Class II" asbestos work means activities involving the removal of ACM which is neither TSI or surfacing ACM. This includes, but is not limited to, the removal of asbestos-containing wallboard, floor tile, and construction mastics.

"Class III" asbestos work means repair and maintenance operations where ACM (including TSI and surfacing ACM and PACM) is likely to be disturbed.

"Class IV" asbestos work means maintenance and custodial activities during which employees contact, but so as not disturb ACM or PACM, and activities to clean up dust, waste, and debris resulting from Class I, II, and III activities.

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see also:

Thermal System Insulation (TSI) See what OSHA says about asbestos and thermal system insulation (TSI)
OSHA: Thermal system insulation (TSI) in regards to asbestos and ships

Insulation Ship scrapping workers should be aware of asbestos in insulation
Insulation a problem for ship scrapping workers and asbestos exposure