A little bathroom advice please

[BOFH]

Hi chaps, I have to convert a bathroom into two soon, leaving one bathroom and an en suite.

The floor is not too cleaver I'm told, and I'll be building a stud wall. I'd like your opinion on marine ply/WBP. I was thinking of boarding out the floor and the stud wall but I'm unsure of the thickness I should be using.

The wall and floor will be tiled but there's no decision on the tile type at the moment.

So what thickness for the floor and wall WBP?

One other thing, when I had a look at the room I noticed the top of a wall that appeared to bow in a little, I'll be tiling that wall for a shower and I'm wondering what I'll do about the bow in the wall, chip it back and bond it flush?

Many thanks guys.

 

[Scott]

I usually use hardibacker but only because the supply was local. Aquapanel and all the others do the esame job and to be honest i dint think there is much difference in the price between them. It will cost more than the ply though.