Three more trips to that job after the crane goes home
You go back for welding and drypack, then caulk a season later, then patch at punch, and the GC picks the week for every one of them.
Most subcontractors demobilise once and their cost curve ends there. A precaster's scope splits across four visits separated by months, and the last three carry full mobilisation cost against line items that were bid as small change. That inversion is why the caulk trip loses money on nearly every job, and why nobody catches it: the cost hits long after anyone was still watching that job.
The size of it
You eat three return mobilisations at $2k to $6k each in crew, access equipment, and travel, all of them after 96% of the contract has been billed. The scope line they're charged to was bid at a few thousand dollars.
Erection is one trip of four, and the last two are the ones that eat the job. When the final piece is set the crane leaves, and the scope keeps running. The welded connections and drypack grout go in once alignment is confirmed. Joint sealant can't go in until the structure is loaded and movement has stopped, which is often a season later, and patching of chips, bug holes, and lift insert recesses waits for punch. Each return needs access, a boom lift, a swing stage, or a mast climber, and each one is a separate crew mobilisation with travel on top. Caulk and patch together are 2% to 4% of contract value, and they're the items the GC ties substantial completion and retention release to. Those trips get called at the GC's convenience, which means they fall in whatever week is worst for you.
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 precast concrete contractors money
The same mechanism in other trades
What precast concrete owners ask
Precast caulking and patching return trips cost more than they pay?
You go back for welding and drypack, then caulk a season later, then patch at punch, and the GC picks the week for every one of them.
What does it cost?
You eat three return mobilisations at $2k to $6k each in crew, access equipment, and travel, all of them after 96% of the contract has been billed. The scope line they're charged to was bid at a few thousand dollars.
What do I do first?
Price each return as its own SOV line for welding and drypack, for caulking, and for patching, with a mobilisation amount carried inside each one.
What are precast concrete contractors supposed to be making?
Precast concrete runs 22% gross margin, 15% 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.