Will be tiling a wet room up to 1.8m high with newly plaster above. Some of the walls below arent that great and im thinking installing no more ply right around. What i want to know, seeing as ill be 6mm out from the wall and ill be tiling upto the 1.8m height, is there a bead that will cover the void aswell as covering the top of tile or is it just a matter of filling this area with grout.