So forget about cement boards and foam boards and just tile direct onto wood?

[Glynn]

Exactly has it would on a backer boarded floor. First and formost the floor must be strong, no deflection and capable of supporting the tiling installation. BS 5385. The ply-board is only there to over lay an unsuitable substrate ie: chip-board, floorboards. If the main floor structure is not up to it yes the edges are where most failures occur. Is that the ply-board failing or the structure of the floor not being suitable in the first place.

 

[Waluigi]

This is the reason I do my own prep work.
I just wouldn’t consider doing the job if I didn’t.

 

[Glynn]

"Best Practice is" Trust no one to tell you "its good to go mate"

 

[Flintstone]

My thoughts on plywood is that it's probably the worst overlay surface you can tile onto and the sooner it's deemed unacceptable the better. Yes there are as Glynn says a couple of types of ply that are ok, but we all know that the important part of the spec of the ply wood gets lost in translation or disregarded and people end up buying builders yard 9mm ply. As for this Webber adhesive, well simply why would you risk it ?

 

[Waluigi]

SP101 isn’t easy to get either. In a 20 mile radius to me there are only two companies that sell it. Both only stock 6 and 9mm variants. Ideal for LVT