hi, i have been asked to tile a bathroom in slate,Picture 004.jpg

Picture 005.jpg

Picture 001.jpg not sure if it needs tanking what needs tanking or if slate will be to heavy (300x300x10mm).i think i need plaster board and tanking on shower wall and external wall but there is a window close to where the shower will be aswell, do i need to do anything extra with this? also on external wall do i need to take plaster skim/render off and fix plaster board to block wall?? she has a new bath to go in do i need that in before i tank? sorry if this is confusing, im confused! hope picture helps

I would use aqua panels instead of plasterboard, then you dont need to tank. Your tiles are very heavy and maybe near the limit for plasterboard.
Get the bath fitted before any tiling starts.

cheers, do i need aqua panel on external wall as well? do i need to do anything with the window ledge?

Any walls that will come into contact with water should be tanked for peace of mind. You could make a window ledge from aqua panels, its more expensive than plasterboard but far superior.

I would fix aquapanel along the bath wall too as the existing plaster is not ideal to fix tile to

thanks alot for the help

i thought as such, so do i need to fix aqua panel to brick wall or can i put over render?? just to the bath or to floor??sorry if there stupid questions