An Insulator is a construction professional who applies insulating materials to surfaces of mechanical (heating, plumbing, HVAC, etc.) equipment for commercial and industrial projects. An insulator fits, wraps or attaches required insulation material to or around a vast variety of mechanical equipment such as air ducts, hot and cold pipes, storage tanks, boilers, refrigeration units, pumps, etc. When required an insulator will apply jacketing (plastic, metal, etc.) to the insulation material for a vapor barrier and/or to protect from the elements. An Insulator must be able to perform his/her work without close supervision, in a safe and orderly fashion and be able to work well alongside other construction crafts.


Basic Requirements:

  • At Least 18 Years of Age
  • Must have Reliable Transportation
  • High School Diploma or GED
  • Birth Certificate and Valid Driver's License
  • Successfully Pass a Drug Screen


Insulators participate in a four year apprenticeship training program consisting of 160 classroom hours and a minimum of 1600 on the job training. Classroom instruction consists of basic math, geometry, fundamentals of insulation, construction safety and hands on training and testing. 


The apprentices will receive incremental wage rate increases based on a percentage of the Journey worker rate, beginning at 55% of Journey worker wages. An apprentice receives benefits such as health insurance the first year and pension benefits by the third year of the apprenticeship program. 


Applications are accepted Monday-Friday at the Union Hall between 7am and 3:30pm or apply online at

Heat & Frost Insulators and Allied Workers Local #74

2000 Walker Street, Suite E, Des Moines, IA 50317
Phone: (515) 288-0472

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