Slate on WBP ply

[finnmccool]

Hello I'm about to lay a slate floor on 18m WPB plywood, I will be using the usual flexible adhesive & grout' but have been advised that this is sometimes not enough & that I should prime the surface before tiling' or risk the slate lifting.
Does anyone have any advice on which primer I should use?
The last slate floor I did some time ago' had underfloor heating' a and I used a heat reflective floor primer and have had no problems' but this may be more luck than judgement!
Thanks
Ciaran

 

[suave]

welcome!

 

[Time's Ran Out]

:welcome: we are in the process of a slate floor, on plywood and with UFH.

To overcome the movement that could be expected within the plywood and at the joins, we overboarded with 6mm cement tile backer boards, laid the UFH with the Fast set flexible adhesive and fixed the slate direct to this prepared surface. As for the primer I'd go with the adhesive manufacturers own primer for wood surfaces.

 

[DHTiling]

Hello Ciaran and welcome.. As above for me.. cement boards all the way.

 

[White Room]

Hi and welcome..

 

[Ian]

Welcome along

 

[finnmccool]

Thanks John! I was hoping to avoid raising the floor any higher but if it eliminates the risk' then its worth the effort. I'm not putting UFH on this floor' if it makes a difference? How do you fix the tile backer board' glued or screwed?
Many thanks!
Ciaran

 

[doug boardley]

Thanks John! I was hoping to avoid raising the floor any higher but if it eliminates the risk' then its worth the effort. I'm not putting UFH on this floor' if it makes a difference? How do you fix the tile backer board' glued or screwed?
Many thanks!
Ciaran

both.. glued and screwed, (using flexible adhesive)

 

[The Legend; Phil Hobson RIP]

:welcome: all good advice above

 

[Rich]

Definatley go with a backerboard. Have a read through the link below for some more info on problems with tiling onto ply.

[h=3]Plywood floors...[/h]

 

[kilty55]

as above a 6mm cement board for me

 

[Aston]

6mm backerboards for me too.
glued and screwed in a staggered pattern with a 2mm perimter joint to compensate movement.
i'm not a fan of tiling on the majority of ply we import nowdays.