Hi everyone. Thanks for all the advice so far, its going pretty good considering i'm a sparky!!! Going to start to tile the walls and have got 600 x 300 porcelain tiles (Topps Regal Vanilla ones) Ok so the walls are skimmed plasterboard on the dot and dab and studwork and the tiles weigh 25kg per sq mtr according to the box. Will I need to put the hardibacker boards on or will i be able to fix straight to the plaster? I have used mapei aquadefence on the walls in the wet areas and Topps told me i needed some Bal primer for the walls to paint on before tiling. I am using Bal single part flexiable adhesive is this ok? I'm fully tiling the shower area and then half tiling the rest of it.