Ironworker definition
An ironworker is a skilled construction tradesperson trained to fabricate, install, and connect steel and iron structures — including structural frameworks for buildings and bridges, reinforcing bars (rebar) in concrete, ornamental and architectural metalwork, and rigging systems for heavy lifts. The trade is governed by standards from the American Institute of Steel Construction (AISC), the Concrete Reinforcing Steel Institute (CRSI), and union training programs administered through the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers (IABSORIW).
The Bureau of Labor Statistics classifies structural iron and steel workers under SOC code 47-2221 and reinforcing iron and rebar workers under SOC code 47-2171. These are treated as distinct occupations, though many ironworkers are qualified in both structural and reinforcing work.
Types of ironworkers
| Classification | Primary Work | Typical Market |
|---|---|---|
| Structural Ironworker | Steel erection: columns, beams, connections | High-rise construction, bridges, industrial structures |
| Reinforcing Ironworker (Rodman) | Placing and tying rebar in concrete | Foundations, slabs, columns, parking structures |
| Ornamental Ironworker | Architectural steel, railings, curtain wall | Commercial construction, residential high-end |
| Rigging and Machinery Ironworker | Hoisting, rigging, machinery installation | Industrial plant work, major equipment installation |
| Connector / Raising Gang | Making initial bolt-up connections on structural steel | High-rise structural; highest-risk, highest-paid role |
What do structural ironworkers do?
- Reading erection drawings: Interpreting structural steel erection plans, connection details, and bolt specifications before work begins.
- Rigging steel: Attaching crane rigging to structural members for placement, communicating with crane operators via hand signals and radio.
- Plumbing and aligning: Using levels and plumb bobs to ensure columns and beams are correctly positioned within tolerance before connections are made permanent.
- Bolting connections: Installing structural bolts to specified torque using impact wrenches and calibrated torque tools. High-strength bolted connections require documented installation procedures.
- Welded connections: Many structural ironworkers also hold welding qualifications for field welding of moment connections and weld plate attachments.
How does the union dispatch system work for ironworkers?
In major construction markets — Chicago, New York, Los Angeles, Seattle, Boston — ironworkers are primarily dispatched through IABSORIW local unions. General contractors on union or PLA (Project Labor Agreement) projects must hire through the local hall. The dispatch hall maintains a list of available union members by classification and dispatches in order of availability. Staffing agencies working in these markets must understand how to work within the dispatch system — attempting to place non-union workers on union-required jobs creates contractual and labor relations problems.
In right-to-work states and on open-shop projects — particularly in the Southeast, Texas, and non-metro Midwest — non-union ironworker staffing operates freely. See the union vs. non-union staffing guide for the full framework. For salary data, see the ironworker salary guide. For hiring guidance, see how to hire ironworkers.