Bathroom floor tiling

[Timmo69]

Hello....

Needs some advice on tiling a bathroom floor.
The floor at the moment is chipboard and covers approx 4 square metres, I am unsure as to what thickness of ply board I should use, is it 6mm, 12mm or 15mm?
Any help greatly appreciated.

Thanks

 

[macten]

15mm wbp ply minimum. Best option is screw chipboard into joists and get it solid and deflection free. Then overboard with 6mm cement board - this is a better substrate to tile to and gets over the increased height issues ply would cause.

 

[Timmo69]

Thanks for the reply Macten, never used cement board before so this may sound like a stupid question, but does it need to be secured in any way to the chipboard?

 

[macten]

Yes Timmo.

There are 2 6mm cement boards that I use NoMorePly (NMP) and HardiBacker 250.
The Hardibacker is bedded onto a suitable tile adhesive and screwed into the chipboard - It's the screws that do the mechanical fixing but the adhesive fills any voids. Word of warning is that the Hardi screws are 30mm long so there is a danger of hitting pipework under the chipboard if you don't know where the runs are (you can just use 20mm turbo screws).
I prefer NMP's fixing method of NMP megastrength glue and NMP screws.

 

[Timmo69]

Thanks for the advice Macten that's definitely the way I am going to do it..

 

[Timmo69]

Just one final question, would it be advisable to use NMP in the shower enclosure area rather than just tiling onto the existing plasterboard?

Thanks

 

[Lincoln-tiler]

Go straight onto the plasterboard. Make sure you tank the shower area and any others areas where lots of water can potentially get to.

 

[Timmo69]

Thanks Lincoln Tiler

 

[Muse2k8]

If you tank the water sensitive areas (look up bal tanking kit or mapei shower kit) then plasterboard will be perfect

As for the flooring then again as mentioned above.

Tbh I just repeated the advice you have been given so yeah... Lol.