Tiling on a cardboard wall!? - Tile Advice

[Duncan]

Hi,
I'm in the process of tiling a bathroom with 600x300 porcelain tiles (24kg square metre) and was planning to use wedi board (well an equivalent) for the plasterboard wall but it turns out the wall isn't a stud/plasterboard wall it's a kind of cardboard waffle/honeycomb construction so there is nothing to screw the wedi board to.
Are there any other options?
Also there are a couple of outside wall where all the plaster has come of leaving a rough (bit flakey) render
I was going to board this as well but would it be safe to tile straight onto the render if it was flat enough.

Thanks for any help received
Duncan
Photos attached

 

[On one]

In this circumstance (I would)
Scrape or steam off any remaining old tile adhesive and give the walls 2/3 good coats of diluted PVA, patch up any large holes and skim the wall with finish plaster.
And when the plaster is dry, prime with diluted SBR liquid and waterproof the walls to be tiled with a tanking liquid.
Not an ideal scenario regarding kgs/m2 though

 

[Bond]

If room allowes, frame with say 50x50 off saw treated ,and board.

 

[On one]

There does not look to be a lot of room behind the taps

 

[Bond]

There does not look to be a lot of room behind the taps

May need to re-position ware, etc . Of course.

 

[On one]

It looks like a newly fitted brand new bath, with the shrink wrapping still on

 

[Duncan]

Thanks for the replies
No there is not enough room to do the 50x50/board option
Isn't it pushing it a bit weight wise to put these on plaster and the drying time is a bit of a problem too.
Do I need to go back and recommend lighter tiles?
Yes it is a new bath, fitted by the owner before I go involved

Duncan

 

[Bond]

Thanks for the replies
No there is not enough room to do the 50x50/board option
Isn't it pushing it a bit weight wise to put these on plaster and the drying time is a bit of a problem too.
Do I need to go back and recommend lighter tiles?
Yes it is a new bath, fitted by the owner before I go involved

Duncan

 

[Bond]

How about glueing and using toggle style fixings into egg box partition, cement render looks a bit friable. Lighter tiles are probably a good call.

 

[Duncan]

How about glueing and using toggle style fixings into egg box partition, cement render looks a bit friable. Lighter tiles are probably a good call.

Hi Bond,
What are these toggle style fixing?
Yes the render is a bit s*** too.
I've not messed with it too much but I think it will be ok to plaster over.
All in all 24kg per meter tiles are not a good idea.

He's gone on holiday so I'll have to get in touch and tell him his bathroom won't be all lovely when he returns :-(

 

[On one]

The thing is......it takes what it takes(timewise)
It might take a bit longer to do it properly, but you have no comebacks on you.

 

[Duncan]

The thing is......it takes what it takes(timewise)
It might take a bit longer to do it properly, but you have no comebacks on you.

Yes indeed, it's just disappointing not to be able to do what I planned and I feel like I'm letting him down a bit.

 

[Bond]

Hi Bond,
What are these toggle style fixing?
Yes the render is a bit s*** too.
I've not messed with it too much but I think it will be ok to plaster over.
All in all 24kg per meter tiles are not a good idea.

He's gone on holiday so I'll have to get in touch and tell him his bathroom won't be all lovely when he returns :-(

 

[WetSaw]

What's the other side of the "cardboard" wall? Could you do anything the other side to be able to mechanically fix the wedi?

 

[Duncan]

What's the other side of the "cardboard" wall? Could you do anything the other side to be able to mechanically fix the wedi?

Hi,
No, that's not an option unfortunately.
Cheers
Duncan