Hello, I have read so many different opinions about flooring for coops but I don't find many that talk about what to use on top of a gravel floor. We have a green house that we have converted into a coop and some of the floor in the green house is gravel, with dirt under that, then there is a small concrete pad as well. The gravel is pretty much impossible to be cleaned. I was thinking of cutting a piece of plywood and just laying it on top of the gravel and then putting a layer of pine shavings on top but I'm worried about the ground moisture under the plywood. Any suggestions on what would be the best thing to do for flooring?