Our small flock lives in the bottom of our barn. There are wood planks down covering dirt. Pine shavings on top. The problem is moisture along side the walls as this is a bank barn and there is run off from the adjacent hill side. My husband wants to remove the planks and put pine shavings atop the dirt. I thought maybe some type of PVC board down on the dirt. Other than move the birds, what would be the best solution?