One pour day outspends a month of payroll
Tuesday morning you spend sixty grand before lunch, you bill it on the 25th, and the money reaches your account sometime in October if the GC gets paid.
Flatwork's spend is lumpier and further front-loaded than any other trade's, because one morning consumes a month's worth of material in seven hours. The vendor financing that morning can shut down your whole operation over a single late statement, which turns one slow-paying GC into a company-wide stoppage across jobs that are current. That's a cash timing problem, and no margin number on the P&L will tell you it's coming.
The size of it
Your ready-mix supplier is effectively your largest and least patient lender, and their collection tool is your entire schedule. That's the real mechanism behind the near-miss on payroll: the profit reads fine, and the calendar of when the cash moves is what breaks.
A 400 yard placement is roughly $66,000 of material bought and consumed between 6am and 1pm. Ready-mix terms are usually net 30 from statement, and the supplier holds leverage no other vendor has: a past due balance triggers a credit hold that stops deliveries on every job you have, not only the one that's behind. The subcontract is pay-when-paid, so the cash for that Tuesday comes back 45 to 75 days later. Before any of it is billable you've already paid for forms and lumber, rebar and welded wire mesh delivered and tied, vapor retarder, chairs, dowel baskets, blades, and cure and seal.
Three moves, in order
Step 07: Monthly cadence
Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month.
What else costs concrete flatwork contractors money
The same mechanism in other trades
What concrete flatwork owners ask
How do i cover ready mix bills before the gc pays me?
Tuesday morning you spend sixty grand before lunch, you bill it on the 25th, and the money reaches your account sometime in October if the GC gets paid.
What does it cost?
Your ready-mix supplier is effectively your largest and least patient lender, and their collection tool is your entire schedule. That's the real mechanism behind the near-miss on payroll: the profit reads fine, and the calendar of when the cash moves is what breaks.
What do I do first?
Build a 13 week cash calendar keyed to pour dates, with the yardage and the dollars sitting on the day the trucks roll, not on the day the job starts.
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 07, monthly cadence. Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month. It comes from chapter 7 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.