Your Glass Lives on the Job a Year After You Hang It
You set perfect lites at dry-in, then twenty-two months later the architect walks the elevation and writes up every mark other trades left behind.
A finish trade installs at the end and walks off. You install in the middle and then have to guard the result through every trade that follows you. No other sub leaves a fully finished, warranted, architecturally inspected surface exposed on a working site for twelve months, and no other sub has a repair that costs a ten week reorder plus a re-rig.
The size of it
Because replacement means a ten week reorder and another rig, the practical outcome is a credit against the contract, often $5K to $40K of pure margin surrendered at closeout while retention is still being held. The job read fine at 80 percent complete and lost money at final.
Curtain wall goes in early because the interior trades can't start until the building is closed, so your finished, visible, fragile product then lives on an active jobsite for a year. Welders throw spatter that pits glass, concrete cutting spits slurry onto anodize, other subs cut protective film or hang tie-offs on your mullions, and sealant surfaces get contaminated. At punch the architect writes up every mark on the elevation, and the GC gives that list to whoever's scope covers the work. Proving that the scratch on lite 14-06 came from another sub's grinder in month 15 takes photo documentation nobody took.
Three moves, in order
Step 08: Standards and accountability
Five hours a month of owner time, spent ahead of the work.
What else costs curtain wall and glazing contractors money
The same mechanism in other trades
What curtain wall and glazing owners ask
Who pays for glass scratched by other trades before punch list?
You set perfect lites at dry-in, then twenty-two months later the architect walks the elevation and writes up every mark other trades left behind.
What does it cost?
Because replacement means a ten week reorder and another rig, the practical outcome is a credit against the contract, often $5K to $40K of pure margin surrendered at closeout while retention is still being held. The job read fine at 80 percent complete and lost money at final.
What do I do first?
Photograph every elevation at glass acceptance with dates and lite marks, filed by lite number, so any later scratch has a before picture.
What are curtain wall and glazing contractors supposed to be making?
Curtain wall and glazing runs 27% gross margin, 18% overhead and 9% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits 2 points above it. The CFOS target is 11.5%.
Which part of the system fixes it?
The step is number 08, standards and accountability. Five hours a month of owner time, spent ahead of the work. It comes from chapter 8 of CONTROL: The Construction Financial Operating System.
Josh Luebker ran commercial construction projects before he ran the numbers behind them, on data centres, military bases, hospitals, and high-rises. He wrote CONTROL: The Construction Financial Operating System, which is an eight-step framework for commercial subcontractors, and it publishes on October 1, 2026. He is a master electrician who moved into the office and kept the field vocabulary.
Sulphur Prairie Operations LLC maintains the benchmark reference behind these figures. Every edition is reconciled against the newest CFMA survey release before it publishes here. Where a figure changes between editions, the older edition keeps its year in the title so a citation to it stays correct.