SAFE verdict contested
The core of this job — measuring in place, fabricating and hanging ductwork, flashing, and architectural panels in attics, plenums, rooftops and unfinished buildings — is physical work in spaces no current robot navigates. AI is already eating the front end: takeoffs, sheet nesting, CNC programming, BIM coordination drawings and cut lists that used to be layout hours. The modal worker is a field installer, and that tier is durable; shop-only fabricators who mainly drive plasma tables and press brakes face more pressure as nesting and machine setup automate.
Tasks largely resist digitisation. Field measuring an as-built shaft that's 3/4 inch out of plumb, breaking a transition on a brake to fit it, and hanging it on trapeze hangers between existing sprinkler mains is sequential improvised work — the 16 rather than 19 reflects that layout, nesting and CNC cut lists, once a real part of the trade, are now generated upstream from the BIM model.
Hands-on in uncontrolled environments. Crawling a 30-inch plenum, working off a scissor lift on a rooftop curb, screwing standing-seam panels in wind, and carrying 4x10 sheets up stairs in an unconditioned shell is the whole job — there is no version of this done from a chair.
Certification preferred, not legally required. No state licence gates the trade; the 7 comes from what shops actually require — OSHA 10/30, welding and brazing certs, SMACNA and NFPA 90A duct standards you must build to, and the fact that the mechanical contractor's licence and the inspector's sign-off, not yours, carry the legal exposure on the smoke-damper installation you just made.
Some relationship component. Repeat work comes from the GC and mechanical foreman knowing your ductwork will pass a leakage test and your hangers won't need re-doing, plus the union hall and journeyman reputation that gets you called first — but the owner never learns your name and the bid, not the relationship, wins the job.
Meaningful discretion. You decide on the spot how to reroute a main around an unmarked structural beam, whether a fitting can be field-modified or has to go back to the shop, and how to seal a fire-rated penetration when the detail on the drawing doesn't exist in the field — real calls with money and life-safety consequences, held below 14 because the foreman, engineer and RFI process own the ones that change the design.
Has AI actually changed your work?