Is there a standard way to make the back side of a basic timber paling fence look the same as the front? For example, is it ok to attach palings to rails on the back side of the fence? The palings would need to be place side by side as close as possible (to match the front side of the fence). I am concerned that with little to no gaps, moisture would be trapped between the palings and rails and cause rot and mold to develop. What is standard practice? We are located in SE Qld.