To continue... I also have a 20'x 60' shed attached off the back of my mill building where we process blueberries for fresh pack. This has a concrete floor as well with a long drain in one section. During the harvest season the machine gets washed down and a concrete floor is a part of the system. One of the evils we have to contend with.

Back in the mill building there are times when there is a good layer of wood chips on the floor, a natural floor that comes and goes.