Eight Tons of Rebar Tagged to a Drawing That Changed
The EOR approved the placing drawings, the fab shop cut and bent to the bar list, and then somebody moved a footing. Now you own bundles tagged to grid lines that no longer exist.
Structural steel can be re-detailed and re-sequenced into another package because it's still a member that bolts to something else. A bent #8 can't be un-bent, and no other job in your backlog has that bend schedule, so there's no salvage path and no transfer. You're also carrying the delay twice, because the replacement release has to go back through detailing, approval, and the fab shop queue before a single truck moves.
The size of it
On a package where reinforcing is 25 to 35 percent of the cost, one obsoleted release is a five-figure hit that sits in job cost with no revenue line against it. The replacement order restarts the 4 to 8 week clock while the GC is still holding you to the original pour date.
Rebar doesn't come off a rack. A detailer produces placing drawings and a bar list, the engineer of record approves them, and only then does the mill or fab shop cut and bend to that list, typically 4 to 8 weeks after approval. Epoxy-coated bar and post-tension tendons run longer than that. Every bundle delivered carries a mark number and a grid line, which is why it fits one job and nothing else. When a design revision comes through, a footing moves, or a slab thickness changes, approved fabricated steel becomes scrap tonnage sitting in your yard.
Three moves, in order
Step 06: Project management
Billing dates, change orders, and notices, run as standards that hold without anyone chasing them.
What else costs concrete contractors money
The same mechanism in other trades
What concrete owners ask
Engineer changed rebar size after fabrication who pays?
The EOR approved the placing drawings, the fab shop cut and bent to the bar list, and then somebody moved a footing. Now you own bundles tagged to grid lines that no longer exist.
What does it cost?
On a package where reinforcing is 25 to 35 percent of the cost, one obsoleted release is a five-figure hit that sits in job cost with no revenue line against it. The replacement order restarts the 4 to 8 week clock while the GC is still holding you to the original pour date.
What do I do first?
Monday, pull the approved bar list and the RFI log side by side for every open job and mark each release as still at the mill, cut and bent, or delivered.
What are concrete contractors supposed to be making?
Concrete runs 21% gross margin, 14% overhead and 7% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits right on it. The CFOS target is 10%.
Which part of the system fixes it?
The step is number 06, project management. Billing dates, change orders, and notices, run as standards that hold without anyone chasing them. It comes from chapter 6 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.