annmb, are the requests valid? Just because walls were not originally waterproofed, doesn’t mean that they aren’t causing a problem than needs to be rectified. And if you have no by-laws allocating reponsibilities for caring for exclusive use common property, then maybe you need to create some so that this owner has a framework to work within (he won’t want to spend his own money fixing common property, then being hit with a bill for the same work in the exclusive use areas for the other owners).
Personally, If I was trying to get something done and wasn’t getting anywhere because one owner doesn’t speak English and the other owner is “just tired and do not have the time” then I would be heading to Adjudication as well.
Sorry, I have no experience with QCAT so cannot answer your actual question, but someone else here will jump in, I’m sure.