International Association of Heat & Frost Insulators & Allied Workers Local Union 23

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Accepting applications year-round online or in person. Stop by Monday through Friday from 8am-3pm.
Or start your application online.
Program Length: 5 years
When you accept applications: Any time online
Do you accept online applications? Yes

For our program, the minimum entry requirements are as follows:

  • High school diploma/GED
  • Transcripts of your grades.

Our Affiliates

Insulator working on infectious disease control

Mechanical Insulation

The work of the insulator journeyman today covers industrial, commercial and cryogenics. Industrial applies to all types of industries, such as chemical process, petro-chemical, metal and other process industries, liquid organic heating systems, steam condensing cycles, high temperature hot water systems, nuclear energy, fossil fuel steam electric systems, co-generation plants, cement production plants, as well as light industrial production facilities. The Commercial field includes public buildings such as office buildings, hospitals, schools, building services, and refrigerated spaces. Cryogenic is the field of low temperature service, such as required by the liquefied gases, generally below –150 degrees Fahrenheit.

As an insulator apprentice, you will be certified for an Environmental Protection Agency (EPA) Asbestos Abatement program. In addition to the EPA certification, you will receive Fire Stop Certification, OSHA-10 Safety Training, CPR, and Basic 1st Aid Training.

Insulators work with a wide variety of materials, such as fiberglass, cork, calcium silicate, foamglass, expanded silicate, Styrofoam, extruded foam plastics and spray insulations. The various types of insulation come pre-formed, rolled or flat stock. In addition to the various forms of insulation, the insulator will work with protective jacketing consisting of PVC, fiberglass cloth, canvas, aluminum and rubber water proofing membranes. As an apprentice insulator you will be trained in the application of these materials to hot and cold piping, refrigerant lines, duct work, boilers, tanks, large power plants, brine lines and cooler rooms. It is common practice for the insulator journeyman to work from a set of blue prints and specs.