Tiling over floorboads in a bathroom

[aled]

Hi,
I am renovating my property and the bathroom needs a complete overhal. At the moment the bathroom has floorboards. I am not happy to simply tile onto the floorboards as there could be some movement with them. So, with this in mind i need to make the floor more rigid before tiling. Should I: -

1. Fix plywood on top of the floorboards. I have read that to do this i need to use 12mm WBP plywood screwed every 150mm. The only issue with this is that it could cause a step from the landing into the bathroom. Something I would like to avoid if at all possible.
   
2. Remove the existing floorboards and fix plywood directly onto the joists with 25mm WBP plywood fixing noggins where boards join across joists.

I am not in the trade and I have no idea what I exactly need to use in order to make the floor ready for tiling. I would be grateful for your help and advice.

Thanks in advance

 

[doug boardley]

What expansion gap do you all normally leave between each board? I have been leaving a 5mm expansion gap to be safe, just wondering what is deemed the best really.

I leave about 2mm Blocko

 

[Qwerty]

I leave about 2mm Blocko

Ok thanks Doug, thought I was OTT with 5mm. Will keep it down from now on!

 

[Perfect Tiling]

I normally leave a 2-3mm gap which is then mesh taped over, filled with adhesive and levelled off...just like plasterboard. Also best to stagger your boards and put them down in the opposite way to which the floor boards or chipboard go. Not always possible and if its only a small room then not always necessary.

 

[aled]

I will be using 25mm wbp ply on the floor. I know i need self counter sinking screws but was wondering which ones were bast to get (name and size)

 

[dilz000]

Aled you need to overboard the ply with backerboard too.

Well you don't need to, but it is highly recommended

 

[Dan]

Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.