if the floor is solid you can tile straight onto it as long as you use the correct adhesive/grout and silicone. if you do this the water should not be able to penetrate the tiles.
I have just started plastering and i have just skimmed out 5 ceilings ( 15 sq met each ) they were all covered in artex, i PVA'd 1 to 1 and worked hard, Issue, On some parts of the ceiling there are some rough patches and some small holes, the walls looked perfect when i dry trowled them , Please an...