Tiling on floor boards

[David2749]

Hi
I'm about to tile my bathroom floor. It's tongue and groove; I'm going to use concrete boarding 6mm . Do I need to glue this down as well as screw this boarding down prior to tiling?
Cheers

 

[Deleted member 174758]

If you mean cement fibre board, it just gets screwed down on something like 150mm centres. No need for glue

 

[robinbanks]

Consider installing electric heating mats. Even if you don't wire them into anything now, you may in future fancy putting a timer on so you have tiles prewarmed a few minutes before your morning routine; the mats are cheap and I wish I'd had the presence of mind to embed them in my adhesive before I laid the custom water jet cut tiles (that I now do not want to take a hammer to, to install a warm floor) ..

 

[cdbe]

I carefully checked the stability of the joists and the nailing in the floorboards and primed them with SBR and bedded the (staggered) cement boards on flexible tile adhesive and screwed them down. It was a while ago but I must have got the advice from here or another reputable forum as I'm not a tiler. Bit of extra work but anything to avoid the disaster of cracked tiles. I think there was some suggestion of decoupling mats but I believe these are primarily designed for concrete floors.

 

[Jake2021]

I’d use tile backer board , light easy to cut and strong plus water resistant and you can tile directly on them.

If I’m screwing them to floorboards I tend to get a thin sheet of hardboard down first then put backer board down screwed down but I use these with the screws, designed for plasterboard but never had a issue

Just be mindful and thoughtful what’s under the floorboards ie pipes , wires etc and if installing new pipes access for these in the future