We have a lower unit condo in the mountains. our patio is enclosed, however the person above us havs an open patio. The roof of out patio leaks a small amount when it rains or snows.I ma not sure if we will ever get he roof sealed completely, but I would like to put down some flooring and redo the walls. Any suggestions of the type of wood to usde for the walls and would a slate floor be sufficient for the floor??