Originally Posted by tthomass
Shop is built on fill and these are piers for additional support of the slab to help prevent any potential settling. Concrete will be polished and 5-6" of 3500psi with fiber and rebar 24" OC. Floor will pitch to the center where we've got a drain for washing out the shop or what may come off of trucks/equip.
Sounds like a good plan, but don't forget to drain into a catch basin at some point so you have a place for sediment to drop. AND make sure the pipe is well below the frost line outside, I've had to thaw mine twice this winter already, and it's a real PITA.......