New bathroom installation - Floor question

[richardlee]

Hello Guys.

I have just removed my bathroom flooring, back to bare joists. The room is 8'x6' and I will be laying 16" square travertine tiles.

I have read through the posts and spoken to a few people on what to fit as a base, it's all going to be new, wastes etc so floor height isn't really an issue but the lower the better.

I was thinking of the following:
18mm ply screwed to the joists with zinc screws and tanked, then tiling directly onto this. I thought that the ply would provide the rigidity whilst the tanking would prevent moisture ingress into the ply. Is this a good way to go?

I have seen recommendations on using tile backer but from what I have read, tile backer is good when battened to a wall as is does not fail when saturated but on top of ply it seems that it would simply be providing a good tiling surface, but I would still need the ply for rigidity, so the tanked ply would be good enough anyway. . . ?

I have also read that some just tile directly to marine ply, any thoughts on this?

Thanks guys.

Richard.

 

[Mike]

Thanks guys.
One quick question. Are cement boards the same as insulation boards?

Cement boards have some insulation properties but not as good as insulation boards.

tapatalk on my HTC

 

[Hardie.Guy]

Hardiebacker Cement Board for tile and stone is to be used to have a water resistant proper surface to tile upon. It has very little insulation properties.Hardiebacker would heat up quicker and transfer heat better than wood as it has a higher thermal conductivity value, woods acts more as an insulator.

Hardie Guy