Insulator at Heat & Frost Insulators Union
at Heat & Frost Insulators Union in Dorchester, MA
About This Program
The Heat & Frost Insulators Union, located in Dorchester, MA, offers a union insulator apprenticeship for individuals in the Greater Boston area seeking a skilled trade career. As a JATC-affiliated program, apprentices receive paid, structured training from experienced journeymen working on commercial and industrial projects throughout Massachusetts.
This four-year program includes 8,000 hours of on-the-job training and 576 hours of related technical instruction. Apprentices learn to install insulation on mechanical piping, HVAC systems, boilers, and industrial equipment. Classroom instruction covers insulation materials and application methods, safety regulations, energy performance codes, and trade theory.
Graduates earn journeyman insulator status with union credentials, gaining access to competitive wages, health benefits, and pension contributions. Boston's robust construction industry — including major healthcare, academic, and infrastructure projects — provides skilled insulators with strong and sustained employment opportunities.
Wage & Training
OJT Hours
8,000
RTI Hours
576
Duration
4 years
What to Expect as an Insulator Apprentice
Duration
4 years of combined on-the-job training and classroom instruction
On-the-Job Training
~40 hours/week of hands-on work under journeyman supervision (8,000 total hours)
Classroom Instruction
576 hours of related technical instruction (~144 hours/year)
Paid Training
You earn a wage from day one, starting at a percentage of the journeyman rate and increasing as you progress
Time-based program: You'll progress through the program based on completing a set number of hours in both on-the-job training and classroom instruction.
This is a union-affiliated program. Union apprenticeships typically offer strong benefits packages, pension contributions, and structured career advancement through the local hall.
Trade School vs. Apprenticeship for Insulator
Apprenticeship
Trade School
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