A shop floor takes loads a house slab never sees: a hoist, a loaded trailer, a skid steer turning in one spot. The section and the reinforcement get sized for that rather than for a garage.
If you are putting in-floor heat down, the tubing goes in before the pour and the tie-down and the pressure test happen before anybody places concrete. We coordinate that with your plumber rather than pouring around a problem.
Vapour barrier under everything that will ever be heated or finished. It is a cheap thing to skip and an expensive thing to have skipped.
Thickness
5" to 8" depending on what drives on it
In-floor heat
Tubing tied and pressure tested before the pour
Vapour barrier
10 mil under any heated or finished slab
Finish
Hard trowel, or broom where it needs grip
Where we do this work
Shop & Garage Slabs across the whole valley. If you are in one of these, Heath will come and look at it.