For the purpose of the Washington state public works law, chapter 39.12 RCW, heat and frost insulators and asbestos workers apply insulation materials to mechanical systems to reduce loss or absorption of heat, prevent moisture condensation and to deaden sound and prevent vibration.

The work includes, but is not limited to:

• The preparation and physical distribution on the job site of asbestos, cork, plastic, magnesia or similar insulation materials.

• Insulation of mechanical systems, plumbing, heating systems, any insulation connected with air handling systems, refrigeration piping and related vessels, boilers, tanks, flues breechings, evaporators, turbines, fittings, valves, ducts, flues, vats and all insulation connected with steam, condensate, feedwater and/or chilled water, or insulation of any mechanical system for sound control.

• All cleanup required in connection with heat and frost insulators and asbestos worker's work.