Farm loads are a different world from residential. A driveway carries a pickup; a shed floor might carry a quarter-million pounds of loaded grain cart on four tires. Here's how thickness actually gets decided for ag concrete.
It's the contact pressure, not just the weight
What punishes a slab isn't total weight alone — it's how that weight concentrates. A tracked machine spreads its load; a loaded single-axle cart on narrow tires focuses enormous pressure on small patches of slab. Jack stands, hoist posts, and bin legs are worse: true point loads.
So the sizing questions are: what's the heaviest load, what does it sit on, and does it park in the same spot every time? Repeated loading in one zone is what fatigues a slab.
Practical numbers
Our floor anywhere is five inches with rebar. Equipment traffic and parking zones typically run six inches; heavy staging areas — where loaded carts sit at harvest, or under a hoist — can justify more, sometimes with extra steel rather than just extra depth. Zoning the thickness keeps the budget aimed where the loads are instead of averaging it across the whole floor.
These aren't catalog numbers — they come from the load conversation on your site, with your equipment list.
The base carries half the load
A thick slab on soft ground still fails — the slab and base work as a system, and the base's job is to spread each wheel load into the earth without letting the slab bend. Deep lift compaction under ag floors isn't optional at these tonnages, and where existing ground is disturbed or filled, base material gets brought in.
Bring your worst-case load to the free on-site estimate — the machine, the cart, the bin plan — and Jerry will size the floor to it in writing.
Related service
Farm Building FloorsMachine sheds, shops, and pole barns — floors sized for the equipment on them.