I don't have any waterproofing on my plywood floor. And when I completely clean it out, maybe every six weeks (it's a very small coop) the floor is clean and bone dry. And I'm always disturbed at how much shavings I seem to be wasting. I use a poop board as well and clean that off every couple of days. It was recommended to me not to use paint on the inside of the coop. The only thing I do have trouble cleaning however is the roost. It is not easily removable and if I do unscrew it and wash it, seems it would take forever to dry....