Bathroom lining?

[junglejim]

I’m guessing this is a bit of a rabbit hole but I’m looking at options for bathroom. Currently thinking of a former shower tray with waterproof boards on the walls and possibly floor then tiling over. I’m looking at jakoboard and kerdi and leaning towards kerdi but interested in anyone’s experience and thoughts? Thanks 

[JohnMo]

Green plasterboard? Waterproof tile adhesive and tiles. Low profile shower tray?