Heat & Frost Insulators

International Association of Heat & Frost Insulators and Allied Workers

Local 34


Insulation workers use tape measures, handsaws, knives, scissors and specialized equipment to measure, cut, install and replace materials such as fiberglass or styrofoam to insulate mechanical systems in residential, commercial, and industrial settings. Requires situational awareness, spatial relations, physical fitness, reasoning, problem solving, mechanical intuition, ability to read blueprints, and communication skills, positive attitude and reliability.

Insulators may choose to specialize in projects that utilize a particular insulation type, such as:

Mechanical insulation is thermal insulation used on piping and equipment for heating & cooling systems �such as plumbing, boilers, HVAC systems, and ductwork

Sound attenuation projects are those which use sound-dampening materials to create either a soundproof environment (like a recording studio) or simply reduce noise levels (like in a factory).

Specialty fabrications includes closed cell elastomeric insulation, refrigeration systems, and the installation of protective jacketing on insulated mechanical systems in industrial environments (like refineries, power plants, or food processing facilities).


To qualify for an apprenticeship program applicants must be at least 18 years of age, hold a high school diploma or GED, and possess the physical ability to do the work. The four year state indentured apprenticeship program required to become an insulation worker combines traditional classroom learning with extensive on-the-job training under expert mechanical insulators.

Apprentices dedicate 172 hours annually to a professional curriculum, studying under 1-2 instructors per year and measuring progress with weekly grading and annual exams. In-depth coursework focuses on four critical areas: the installation process, material layout, job specs, and reading blueprints. The Local 34 office is located in St Paul, MN.


Pete Verdeja | Business Agent
p: 651-312-1245
c: 612-790-0933

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