Tiling a bathroom floor ply wood size??

[ossm145]

I am a vey good DIY person and I have been work on my house since December and doing a complete renovation and I think it should be ok just wanted some advice as I though 5.5mm was thin but since I install my new t & g floor boards it seem really sold with no movements on your feet, so I thought upping it to 9mm plus the 18 floorboards would make it 27 mm .
So how many screws would you use and how far apart


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[wine~o]

I stand by what I said earlier. No-one is going to say "yes, 9mm will be fine" it might be OK, it might not be.

IF I was doing it and had no choice..then I would be using 60mm screws into the joists every 300mm.

Flexible tile adhesive. And if I was doing it for a customer...I would not give any guarantee .

[philprime]

T&G floorboard will expand and contract over time like all timber does that's why others have said ply

5.5mm ply is far to thin 18mm plus is much better but I can understand you don't want to rip up new flooring but you are the one who has to live with it at the end of the day

[ossm145]

Ok thank you for your advise and I fully see where you are coming from
Many thanks



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[royaloakcarpentry]

(I wouldn't) but if I were chancing my arm on a job then I would be inclined to up the percentage of it not failing by a small margin by using BAL Fastflex adhesive.

It will only give yo a small margin of improvement. Better off to get the background correct though.