First rule, regardless of what you decide for a barn floor (or barn design), is to locate your barn in an area where water will not “migrate” into the barn. If the area has poor drainage, that might mean you need to build up the area under and immediately around the barn foundation.
Before we built the goat barn (12×12), I had planned a concrete floor with drains as I have in my chicken house which has served well there. However, before starting the goat barn, I decided to get opinions from my favorite goat group. In the nearly two months which followed, I collected dozens points of view. Most of those opinions included reasons for the decisions and the results as well as “if I had it to do again” comments.
VanEden Goats 