CONCRETE FLATWORK · CONCRETE AND MASONRY · FIXED BY STEP 06

The long lead item in flatwork is a truck slot

You can't buy concrete ahead of the job or ahead of a price increase. You buy a place in the plant's Tuesday morning schedule, and the plant decides whether you keep it.

WHY IT'S A CONCRETE FLATWORK PROBLEM

Every other trade de-risks lead time by ordering early and warehousing the material. Flatwork can't do either, so schedule risk and price risk become the same risk: you can't buy ahead of an increase, and you've no inventory to pour from on a morning the plant says there are no trucks. The supplier controls both the date and the price, and you pay the crew either way.

WHAT IT COSTS

The size of it

A blown pour day on a 20 man placing and finishing crew is roughly $6,000 to $9,000 of direct labor plus a boom pump minimum of $800 to $1,500 and any equipment day rate, recovered from no one. The day also comes out of the week's capacity, so the next job starts behind before it starts.

OVERHEAD AT $1M–$5M

14%

CFOS target 13% for concrete flatwork.

GROSS MARGIN AT $1M–$5M

22%

CFOS target 24.5% for concrete flatwork.

NET PROFIT AT $1M–$5M

CFOS target 11.5% for concrete flatwork.

Concrete has a working life of about 90 minutes from batch, so the long lead item is a delivery slot on a specific morning, and no amount of ordering early changes that. Cement plants ran near 92 percent capacity utilization nationally and 96 percent in the Southeast into 2026, and several ready-mix producers put allocation programs in place capping daily delivery volume per customer. When a large pour or a DOT job wants the plant's trucks, the small flatwork account is the one that gets bumped. The slot moves and the crew, the pump, the laser screed, the finishers, and often the special inspector move with it, and everything except the concrete is already committed.

WHAT TO DO

Three moves, in order

STEP 01

Write down your standby cost for one lost pour day, labor plus pump minimum plus equipment, and give that figure to the GC at signing so a moved pour has a price on it before anyone moves it.

STEP 02

Confirm the slot with dispatch 48 hours out and again the afternoon before, and get truck count and spacing back by text or email so there's a record of what was promised.

STEP 03

Ask your plant where you rank in their allocation and what daily volume trips the cap, then keep a second supplier qualified on the same mix design so a bump costs you an hour, not a day.

THE FIX

Step 06: Project management

Billing dates, change orders, and notices, written as standards that work without anyone chasing them.

CFOS-06 · CHAPTER 6

Billing and change orders that hold without chasing

What this step changes, what it depends on, and how to tell it's installed.

BENCHMARKS

Concrete flatwork by revenue band

All 7 bands are published. The CFOS target is beside the figure up to $10M to $25M, and the 4 bands above that are labelled modeled.

ACROSS EVERY TRADE

The change orders you did and never billed

The field did the work. The paperwork never caught up. Ninety days later there is no record that proves it happened.

SAME TRADE

What else costs concrete flatwork contractors money

CONCRETE FLATWORK · CFOS-04

Your ready-mix quote expires. Your subcontract doesn't.

You priced the yard in March off a quote sheet and bought it in November off a new one, and the number you signed with the GC never moved an inch.

CONCRETE FLATWORK · CFOS-01

The 63 yards disappear between square feet and cubic yards

The slab came out at the thickness the drawings called for, you never got a change order, and you still bought and placed yards that weren't in the bid.

CONCRETE FLATWORK · CFOS-07

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.

CONCRETE FLATWORK · CFOS-02

You bid one mobilization and drove out five times

The building slab made money and the sidewalks, ramps, and dumpster pad at the end took it back, eighteen months after you priced them.

CONCRETE FLATWORK · CFOS-08

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.

SAME MECHANISM, OTHER TRADES

The same mechanism in other trades

CONCRETE

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.

DEMOLITION

Your Breaker Burns Tool Steel That Overhead Pays For

A hammer chews $9,000 of tool steel on one teardown and the job that ate it never sees a dollar of the cost. The margin looks fine and the bank account disagrees.

DRYWALL

Lead-lined board is eight weeks and non-returnable

The imaging room's board is eight weeks out, cut to the shielding drawings, and the deposit is gone the day you release the order.

QUESTIONS

What concrete flatwork owners ask

Ready mix plant keeps bumping my pour date?

You can't buy concrete ahead of the job or ahead of a price increase. You buy a place in the plant's Tuesday morning schedule, and the plant decides whether you keep it.

What does it cost?

What do I do first?

Write down your standby cost for one lost pour day, labor plus pump minimum plus equipment, and give that figure to the GC at signing so a moved pour has a price on it before anyone moves it.

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 is 1 point above it. The CFOS target is 11.5%.

Which part of the system fixes it?

The step is number 06, project management. Billing dates, change orders, and notices, written as standards that work without anyone chasing them. It comes from chapter 6 of CONTROL: The Construction Financial Operating System.

OR HAVE IT HANDLED

Everything on this page is something you can install yourself, andCONTROL is the order to do it in. If you would rather buy the finished result, SPM The Construction CFO does this work for concrete flatwork contractors as a service. It is a separate firm, Sulphur Prairie Management, LLC, run by the same author.

What a fractional CFO does for concrete flatwork contractors

AUTHOR

JOSH LUEBKER

MASTER ELECTRICIAN · 150+ PROJECTS · $2.1B+ MANAGED

Wrote CONTROL, the 8 step system behind these figures. More about the author.