Heat & Frost Insulator
HFIA Local 34
Install and maintain mechanical insulation on piping, equipment, and ductwork in commercial and industrial buildings.
Starting Pay
$27.67/hr
1st year apprentice
Journeyman Pay
$55.34/hr
~$111k/year
Apprenticeship
4 years
earn while you learn
Total Package
$150,000+
wages + benefits
Overview
The Work
Heat and frost insulators from HFIA Local 34 install, maintain, and repair insulation on pipes, boilers, ducts, tanks, and other mechanical systems throughout the Twin Cities, southern Minnesota, South Dakota, and western Wisconsin. The work keeps hot systems hot and cold systems cold — critical for energy efficiency and worker safety. You'll insulate HVAC ductwork in office buildings, wrap steam pipes in hospitals, and jacket process equipment in industrial plants. Local 34 members also perform asbestos and lead abatement work, removing hazardous materials from older buildings. Founded in 1913, the local has deep roots in the region and continues to grow as energy codes tighten and building owners invest in efficiency upgrades.
Day One as an Apprentice
Your first day you'll report to a commercial or industrial job site and meet your journeyman mentor. Expect to start by learning how to measure and cut insulation materials, apply vapor barriers, and prep surfaces for insulation. You'll carry materials, clean work areas, and observe how experienced insulators fit insulation around complex pipe configurations and equipment.
This trade is
Pay Scale
Pay increases each year of the apprenticeship as a percentage of the journeyman rate. All rates are hourly; estimated annual at 2,000 hrs/year.
| Year | Stage | Hourly | Annual Est. |
|---|---|---|---|
| 1 | 1st Year Apprentice | $27.67/hr | ~$55k |
| 2 | 2nd Year Apprentice | $33.20/hr | ~$66k |
| 3 | 3rd Year Apprentice | $41.51/hr | ~$83k |
| 4 | 4th Year Apprentice | $47.04/hr | ~$94k |
| 5 | Journeyman Insulator | $55.34/hr | ~$111k |
Benefits Package
Full family health insurance, defined-benefit pension, annuity fund, and paid vacation. Total compensation package is well above what most people expect from a construction trade.
Apprenticeship Program
4 years
Program Length
688 hrs
Classroom Hours
8,000 hrs
On-the-Job Hours
How to Apply
Contact the Local 34 apprenticeship office or apply through their website. You'll need a high school diploma or GED and a valid driver's license. Drug testing is required.
Application Windows
Check insulators34.org or call the hall for current application dates.
Requirements
General Requirements
- High school diploma or GED
- Valid driver's license
- At least 18 years old
- Drug-free workplace — pre-employment drug test required
- Physically able to lift up to 50 lbs and work on ladders
Physical Requirements
- Ability to lift and carry insulation materials up to 50 lbs
- Comfortable working overhead and in tight mechanical rooms
- Ability to work in hot environments near steam pipes and boilers
- Good manual dexterity for cutting and fitting insulation
Tools You'll Need
- Basic hand tools: insulation knife, tape measure, straight edge
- Work boots (steel-toed required)
- Hard hat and safety glasses (often provided by employer)
Physical Demand
3/5
Technical Level
3/5
Union Hall
Market Outlook
High Demand
MN DEED projects 7% growth for mechanical insulation workers (SOC 47-2132) 2022–2032 and BLS projects 5% 2024–2034 (faster than average, with a Bright Outlook designation). Demand is driven by energy-efficiency mandates and industrial mechanical systems work.
Next Steps
Ready to learn more or apply? Here's what to do right now.
Wage source: Journeyman base hourly rate is sourced from the Minnesota Department of Labor & Industry Commercial Prevailing Wage Schedule (effective 2025-12-22), which is derived from the prevailing collective bargaining agreement for Twin Cities, Southern MN, SD & Western WI. Total package (with fringe benefits) is higher than the base rate shown. Apprentice progression rates are calculated as standard percentages of journeyman scale and may differ slightly from the actual CBA. This page is not affiliated with HFIA Local 34 or any union. Verify all information — including current pay rates, application windows, and requirements — directly with HFIA Local 34.