plastic ply on caberboards before tiling?

[rosyposy]

Going to tile our kitchen floor with 67x45cm porcelain tiles. Currently there is 'green' chipboard on the floor and a few 'caberboard' which I have put down to replace the green stuff which was damp. All the boards seem quite secure. The tile shop said we could not tile onto the chip board and would have to use 'plastic ply' which is sticky backed and comes in rolls. Has anyone used this? Should we put ply down instead (although I don't want to do this as this will raise the floor quite a bit.)
They said we need to seal the chip boards, then put down the plastic ply and then tile on top of this.
Anybody have any more advice?

 

[DHTiling]

Do you have joists..?

 

[rosyposy]

no I think the floor is concrete then plolystyrene and then the chipboard. I dont want to take it all up as the kitchen cupboards are on it.

 

[peckers]

I haven't ever used the plastic ply before, But to be able to use this as on there web site. N&C (Nicholls and Clarke) Building materials manufacturer and supplier The floor must have no movement at all, look at the bottom of the page in smaller print!!! on the section on the info for plastic ply,

 

[Matt]

I just watched the instruction video from that link and they advise using PVA to prime the timber before starting :yikes:

 

[grumpygrouter]

no I think the floor is concrete then plolystyrene and then the chipboard. I dont want to take it all up as the kitchen cupboards are on it.

Hmmm floating floor......asking for trouble by the sounds of it!!

 

[DHTiling]

IMHO floating timber floors should not be tiled....

 

[Stan001]

Humm, looks like an interesting product. (I put ply with 150mm centre screws over my caberdeck before tiling). I have an open question, maybe its just me being very thick (as usual). I see ‘plastic ply’ and ‘no more ply’ and they are thinner than standard ply, this is great. They are claimed to perform better than standard ply – again this is great. But if ‘we’ use these wonderful products are we still keeping within British Standards? (important to me if I do a tiling job for someone and claim I did it to industry standards and very important to me on my builds due to warranty issues). I want to use the latest greatest stuff (which I’m sure has been fully tested) – but I worry a little about meeting my legal commitments. Any legal-beagles around here? (is BS a performance or definition spec?)

 

[DHTiling]

Bs are guidlines to work to that adhesive comps will guarentee thier products if you adheared to bs5385.

They are not strict regualtions as other trades have but most fixers do try to stick to within bs5385 guidlines.


Plastic ply and no-more-ply re NOT mentioned within bs5385 and can only have the word of the manufactuer as to how they should perform....it is my understanding tha plastic ply is more of an anti crack system than a strengthening one..and no-more-ply is the same as hardi in that the substrate must be solid enough before using it...

So in theory they do not add strength but are used for moisture control more than adding strength...thats my view anyway.

 

[grumpygrouter]

Bs are guidlines to work to that adhesive comps will guarentee thier products if you adheared to bs5385.

They are not strict regualtions as other trades have but most fixers do try to stick to within bs5385 guidlines.


Plastic ply and no-more-ply re NOT mentioned within bs5385 and can only have the word of the manufactuer as to how they should perform....it is my understanding tha plastic ply is more of an anti crack system than a strengthening one..and no-more-ply is the same as hardi in that the substrate must be solid enough before using it...

So in theory they do not add strength but are used for moisture control more than adding strength...thats my view anyway.

I agree Dave.