tile on ply boxed in pipes!

[59peejay]

I'm having trouble getting tiles to stay on a ply boxing about 1 foot squre,above kitchen worktop.I'm using a tubbed addy, a mapei ultimate grab from bnq with 200mmx100mm ceramic tiles about 6mm thick.First go i didnt prime the ply with anything and just tried it direct on and they have'nt taken to it,whats the best method to get them to stick?,thanks.

 

[doug boardley]

hmm strange as a dispersion addy should stick to an un-primed ply. My advice would be to fix plasterboard to your boxing, should stick then.

 

[nybor62]

as above

 

[aph257]

it sounds to me there's something on the ply's surface that's stopping it stick. so advise is as above.

 

[Michael kiss]

Plasterboard, then tile. as above.

 

[Stewart]

As above, plasterboard.

 

[Deleted member 1779]

Agree with above (plasterboard if you can)

However in this job we used marine ply to box in a soil stack at an angle. The main reason we used marine ply in the shower was to take the weight of all the shower equipment going in.

To get the tiles to stick we used a tanking system in the entire cubicle. We tanked the plastered wall. The marine ply. The plasterboard (it was a mix of materials!)

End result 6 years later? No loose tiles. No water leaks.

The ply (middle) was coated with a tanking system first.

The photo above is a bit hard to understand so I did a quick video for you...

[video=youtube;WvZpIswVQsU]http://www.youtube.com/watch?v=WvZpIswVQsU[/video]

The marine ply takes all the weight of the shower gubbins. Having the cupboard made it easy to work from behind to install the shower. And we just screwed into the ply.