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State of Washington Classified Job Specification


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Class Code: 614E
Category: Maintenance Trades & Labor


Perform journey-level work insulating mechanical systems.

Distinguishing Characteristics

Apply insulating materials to the surface of all types of mechanical systems, such as pipes, ducts, boilers and tanks.

Typical Work

Insulate domestic hot and cold water lines, high and low pressure steam lines, chilled water and refrigerant lines, heat pump systems, roof drain lines, air conditioning systems, boilers and tanks by application of fiberglass, calcium silicate and assorted petroleum by-product insulating materials; 

Mold, fabricate and repair special parts and fittings; 

Operate and maintain hand and power tools and equipment; 

Remove and reinsulate non-asbestos insulation materials from facilities and equipment; 

Remove and repair asbestos materials from facilities and equipment; 

Drive service truck as required; load and unload materials and supplies; 

May direct and instruct helpers; 

May assist in preparing preliminary cost estimates for installation and repair projects; 

May perform work in other trades; 

Perform related duties as required.

Legal Requirement(s)

There may be instances where individual positions must have additional licenses or certification. It is the employer’s responsibility to ensure the appropriate licenses/certifications are obtained for each position. 

Desirable Qualifications

Completion of a recognized apprenticeship as an insulation worker


full journey status as an insulation worker in a union


four years of applicable experience OR equivalent education/experience. 

Class Specification History

New Class: 1-03-73
Revise Code & Title: 1-18-74
Revise Class: 1-21-83
Revise Class: 4-6-90
New class code, formerly 5360, effective July 1, 2007.