Tiling onto suspended floor (bathroom)

[Ryaneb85]

Hi all, this is my first post, hope you can help out.

I'm redoing my bathroom from top to bottom. I am going to be tiling the floor, so while the room was totally empty I ripped the old floor boards out and laid down some 18mm Tongue and groove water resistant chipboard from wickes:

http://www.wickes.co.uk/tongued-and-grooved-chipboard-flooring/invt/164516/

I am paranoid about the tiles cracking after reading so many horror stories. I have seen numerous posts that suggest fixing hardiebacker onto existing floorboards, but my question is do I still need to put hardiebacker down seeing as I've replaced the floorboards? I have put in extra noggins to secure the flooring as much as possible.

I don't really want to put down an extra 6mm if possible as the floor height is perfect at this moment in time.

Any extra advice that you tiling pro's may have that may help out will be greatly appreciated.

Thanks in advance.

 

[nybor62]

take out chipboard put 15mm ply 6mm backer board , your only gaining 3mm

 

[Ryaneb85]

Thanks for the advice so far. I think I will just put cement board on top of the existing chipboard as it doesn't sound like it will be that advantageous replacing the chipboard with ply and then cement board.

Before I move on with the tiling tomorrow, am I right in thinking there is nothing more I can do to reduce deflection/movement or anything that is going to cause the tiles to crack?

Thanks

 

[White Room]

Your've allready put extra noggins in, just make sure theres no bounce.