radiator in bathroom

[kakawak]

hi guys,

my reactangular bathroom is not equal at the short sides ie window side and opposite door side. it is about 2-3cm out at the window side compared to the door side. i suppose what im trying to say is that it tapers outwards towards the window side if that makes sense. how do i tackle this before i start tiling? do i need to fill one side of the wall or pack it out with a plasterboard?

if i leave it as it is, i will no doubt have issues with squaring this off when i do the floor. any ideas on how to remedy this situation is most helpful

cheers

 

[kakawak]

update on floor.....it looks like i have a slight dip in the middle of floor after i have screwed the plywood down...

should i use a self leveling compound? i would say the dip is about 3mm when i use my level across the floor. is there a tolerance for dips or will the tiling adhesive make up the shortfall?

cheers