Recommendations on walls for pre tiling

Renovate

I am taking old chalk slabs off partition wall in bathroom as they are not in great condition and was never skimmed over. I’m wondering what material I should get to put back on partition in preparation to be tiled. green slab, ply or concrete board. There will be a walk in shower against wall also. Any help appreciated thanks

listermint

Green Plasterboard.

And tank the shower area

Dr_Colossus

I've put concrete board all around the walk in shower area and green plasterboard in the areas outside in a recent ensuite job. If using concrete board don't use plasterboard screws, try and get ruspert coated screws or alternatively stainless screws as I've used.
As listermint advised tank the shower area well whether using concrete board or green plasterboard. Concrete board is not waterproof so requires tanking also, it's just that it won't decay if water does come in contact with it.

Renovate

Thanks for your help I ordered 6 green today and two cement boards but they gave something called Uniboard instead it has a mesh running through it. It’s prob better than green but not as good as cement I’m thinking