Tiling on a cardboard wall!?

[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

 

[Bond]

Spring toggles, normally used in plasterboard with cavity behind, they have wings which spring out behind boarding, and screw in to lock in position. Another option for fixing board , is hollow wall anchors. ( needs a setting tool though).

 

[Duncan]

Spring toggles, normally used in plasterboard with cavity behind, they have wings which spring out behind boarding, and screw in to lock in position. Another option for fixing board , is hollow wall anchors. ( needs a setting tool though).

Sound interesting but I just wouldn't have confidence in the whole lot not falling down on one of his kids heads. I can't believe how weedy this wall is!
I suppose its alright if you leave it alone.

 

[dave l and l]

there are a few houses near me that were built using that construction. i have tiled a couple of bathrooms, if i remember it was the door wall into the hallway that was made of that ,the rest was plastered brick.
i never had a problem tiling onto those walls, i have worked in one of the houses since and the tiles are still fine , it was a ceramic tile however,

 

[Duncan]

there are a few houses near me that were built using that construction. i have tiled a couple of bathrooms, if i remember it was the door wall into the hallway that was made of that ,the rest was plastered brick.
i never had a problem tiling onto those walls, i have worked in one of the houses since and the tiles are still fine , it was a ceramic tile however,

Yes this is the bath/hall wall. I'd be happy to tile it with lighter tiles... well if the surface was tided up a bit.

 

[scooby9858]

i came across this once but i was only fitting light tiles and got away with it.but during a search for a remedy i came across a post which said to carefully cut the inside gyproc and remove it and the honeycomb there is a 35mm stud top and bottom to build a new stud frame puting glue on the framework to stabalise the hall side. and when the hall is getting redecorated again screws can be screwed in from the hall side.probably be a big job but might be helpfull to you.

 

[Duncan]

i came across this once but i was only fitting light tiles and got away with it.but during a search for a remedy i came across a post which said to carefully cut the inside gyproc and remove it and the honeycomb there is a 35mm stud top and bottom to build a new stud frame puting glue on the framework to stabalise the hall side. and when the hall is getting redecorated again screws can be screwed in from the hall side.probably be a big job but might be helpfull to you.

Thanks for the suggestion scooby I don't think it's an option for this job but I'll keep it in mind for next time
Cheers
Duncan

 

[Qwerty]

I'm confused as to how this has made 2 pages!!

That wall is called paramount board. Essentially it is a cardboard waffle sandwiched between two 12.5mm pb sheets. The waffle provides the strength.

My recommendation- do the job properly and remove the bathroom side pb sheet and waffle, build up a 3x2 frame within the wall space (with the CLS on its side) and re sheet with pb or tanking board.

I think Scooby is referring to one of my old posts!!!

Do it once, do it right!

 

[scooby9858]

I'm confused as to how this has made 2 pages!!

That wall is called paramount board. Essentially it is a cardboard waffle sandwiched between two 12.5mm pb sheets. The waffle provides the strength.

My recommendation- do the job properly and remove the bathroom side pb sheet and waffle, build up a 3x2 frame within the wall space (with the CLS on its side) and re sheet with pb or tanking board.

I think Scooby is referring to one of my old posts!!!

Do it once, do it right!

yes Geoff that rings a bell great bit of info that and i never forget it.

 

[Flintstone]

Egg box wall

 

[Bond]

Egg box wall

Cardboard waffle, apparently.😉

 

[Qwerty]

No, its called PARAMOUNT BOARD!!! (Yes I was shouting 😀😛)

 

[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 PARAMOUNT BOARD.....

 

[Bond]

No, its called PARAMOUNT BOARD!!! (Yes I was shouting 😀😛)

Cardboard boxed core, PARAMOUNT in name - not stature. 😀

 

[pjohn]

I'm confused as to how this has made 2 pages!!

That wall is called paramount board. Essentially it is a cardboard waffle sandwiched between two 12.5mm pb sheets. The waffle provides the strength.

My recommendation- do the job properly and remove the bathroom side pb sheet and waffle, build up a 3x2 frame within the wall space (with the CLS on its side) and re sheet with pb or tanking board.

I think Scooby is referring to one of my old posts!!!

Do it once, do it right!

This. Just had our bathrooms redone, and found that they also had this "cheap and quick to throw up" material. Our plumber took the top sheet off, got rid of a honeycomb where he ran new battens, screwed them from the outside and put up hardiebacker (room was being tanked in WaterGuard anyway, so cheaper than using wedi board or similar).

Your tiles are already at the limit of skim, and over when you factor in adhesive and grout.

 

[Andyman]

Hi guys new hear.

Not a tiler but do do tiling as part of works

I think this used to be called Paramount partition, it was fixed with a 25x38mm head and sole plate with 1 up the wall and then 1 piece between each board.
I used to hate fitting it, Westbury homes used to use it and to this day I think it was a pile of dog do.
The walls would flex in the middle when pushed

 

[pjohn]

Westbury homes used to use it and to this day I think it was a pile of dog do.

William Davis homes in and around rugby from the early 2000's also use it.