i have a bathroom floor to tile and the floor needs boarding out but because of levels what is the best thing to board with that i could get away with thickness wise???

If you have height issues and it's possible, take up the old flooring, add noggins and board with 18 / 25mm wbp.. having said that, whats the issues with levels ?

Originally Posted by Alan.P

If you have height issues and it's possible, take up the old flooring, add noggins and board with 18 / 25mm wbp.. having said that, whats the issues with levels ?

Basically we have gone down to the floor boards and if we go 18mm board plus tile and adhesive its taking it way above carpet levels.

If the floor boards are solid, then you can use Hardi backer 250..( 6mm)..

I think that was what Alan meant was take up the floorboards as well and fix the ply straight to the joists. That way you wont compromise the height

id take up the boards, noggin the joists. fix 18mm ply , then 6mm backerboard for a more stable surface to tile on especially in a bathroom...

one other thing to mention..always check the joists are well packed into the wall aswell as installing noggins.