Fifteen trades wreck the floor and one sub pays for it
Every contractor on the job used your finished slab as a work platform and a staging yard for a year and a half, and the closeout punch list comes to you.
No other trade's finished product gets walked on, driven over, drilled through, scaffolded on, and stained by fifteen following contractors for eighteen months and then graded on a punch list. The last trade to damage the floor is never the one billed for it. The GC holds your retention as the enforcement mechanism, so the argument starts after your leverage is already gone.
The size of it
Closeout backcharges of $5,000 to $25,000 hit months after the job was closed in your books, reversing profit you already recognized on work you considered finished. Without dated photo documentation at slab turnover, you don't have a defense to offer.
Your slab is the only deliverable on the site that every other contractor works on top of for the rest of the build. Steel erection tracks it, masons mix on it, plumbers core drill it, anchors get shot into it, welding happens beside it, and drywall dumps mud across it. Forklift traffic spalls the joints, and the edges at construction joints take the worst of it. At closeout the GC defaults to a backcharge against the concrete sub rather than doing the forensic work of assigning each mark to the trade that made it, because your scope is the visible surface everyone is looking at.
Three moves, in order
Step 08: Standards and accountability
Five hours a month of owner time, spent ahead of the work.
What else costs concrete flatwork contractors money
The same mechanism in other trades
What concrete flatwork owners ask
Gc backcharging me for slab damage other trades caused?
Every contractor on the job used your finished slab as a work platform and a staging yard for a year and a half, and the closeout punch list comes to you.
What does it cost?
Closeout backcharges of $5,000 to $25,000 hit months after the job was closed in your books, reversing profit you already recognized on work you considered finished. Without dated photo documentation at slab turnover, you don't have a defense to offer.
What do I do first?
Photograph the entire slab the day you turn it over, dated and organized by grid line, and email the set to the GC stating the surface is being accepted as shown.
What are concrete flatwork contractors supposed to be making?
Concrete flatwork runs 22% gross margin, 14% overhead and 8% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits 1 points above it. The CFOS target is 10%.
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.