Eventually, we will fix up a room where the walls are quite lumpy from some sort of plywood or paper, beneath which there is clay plastering and inside that, log walls.
I considered removing the clay plastering, but after reading some professional literature, it seems like a bad idea. We'll probably put up gypsum over the existing lumpy surface.
Does anyone know if there is a thin gypsum board that is still stable enough to provide smooth walls? It would be a bit unfortunate to use too thick a material as we would then have to redo the windows and so on.