Hi everyone. New to this community so any help would be great. I'm looking to ceramic tile the walls of a friend's bathroom, however, this is in a park home where the internal walls appear to be plywood sheets over batten wall. I've only got experience of tiling on a firm plasterboard surface. In this instance would I be able to place 12mm plasterboard directly over/on the plywood, screwing directly into the battens in the wall? My aim is that this would give enough strength on a suitable substrate material. Many thanks.