I have a problem that I hope someone can help me with...
I live in an old house built in 1943 with (I think) pure lime plaster on the interior walls. On the inside of the exterior walls, there is plaster on wood wool boards. The plaster has come off in some areas and I have removed it.
I am considering two options to fix the walls and then tile over:
1. Gypsum plaster (lime plaster is difficult to obtain and "requires more"). The problem is that the boards have old plaster residues that always continue to dust (old lime plaster is never "completely solid"). I'm considering whether one could first prime with something like a "binder" for paint, then gypsum plaster primer (which is intended to create a suction surface), and then apply gypsum plaster.
2. Attach drywall on the quite uneven wood wool boards. But how do you attach them? Battens behind are not an option (I think). It would build too much.
Thanks in advance!
Since no one has answered, I guess I'll answer myself. 
Applied a thorough coat of primer on the träullen and put up waterproof boards using tile adhesive. Also primed the waterproof boards. Stays like a rock.
Applied a thorough coat of primer on the träullen and put up waterproof boards using tile adhesive. Also primed the waterproof boards. Stays like a rock.