General Advice Please

[kelvin]

Hi all.

My project is to lay approx 6m2 of porcelain tiles in a dressing room & 4m2 in the wet room the floor is 25mm ply screwed & glued to the joist with marmox tray at ffh.

My plan is to have electric underfloor cable.

My first question is:

I have used 12mm cement boards to the walls ready for tiling & have 6mm cement boards for the floor will these provide a good enough insulation for the UFH cable would anyone know?

And secondly:

I am planning to put oak floor plate around the dressing room wall edge and this will provide the threshold for the doorways & to tile up against 20mm of thickness I'm thinking of using a coupling membrane,then the cement board,then the cable for the UFH ,slc if I need to bump the height up then tile to the top of this to come up to my FFH.

Does this sound correct?

I would appreciate comments and advice,thanks in advance.


Kelvin.

 

[White Room]

You say cement boards for the floor do you mean hardie type or thermal type.....

 

[kelvin]

When I bought my marmox trays for the wet rooms I purchased cement boards from the supplier they recommended them,they were called no more ply.

Not hardie BB...

 

[White Room]

When I bought my marmox trays for the wet rooms I purchased cement boards from the supplier they recommended them,they were called no more ply.

Not hardie BB...

For the floor I would use 10mm thermal boards if possible or 6mm for height reasons, glue and screw to the floor and lay ufh cable then self level, this will allow more heat to the tiles.

 

[kelvin]

Thanks what would you recommend to fix the cement boards down to the ply with...re glue?

 

[Old Mod]

This will explain everything you need to know about
No more ply

Hope this helps.

 

[StevieBoy]

Thanks what would you recommend to fix the cement boards down to the ply with...re glue?

Toppfix 2 part grey. You will have no issues with that as long as u prime with SBR first.

 

[kelvin]

Thanks for your replies.
So basically I'm heading in the right direction with regards to the method I described ,no one has said if I Should be using the coupling membrane or not but I'm thinking I should and if so any recommendations please or reasons for not ,it's a new build with 25mm ply straight on to 225 x45 joists .