Problem walls after removing bathroom tiles

10 Nov 2023
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United Kingdom
Currently renovating my bathroom, and while ripping the tiles out ( 2 layers of tiles) I noticed the internal walls are not the standard stud-work and plasterboard. They are very thin like a cardboard material down the middle so I have nothing to mechanically fix new plasterboard to.

My initial thought was to fill with bonding, apply a waterproofing/tanking agent, and then tile, but the tiles I intend to use are 18.5kg/m2, plus adhesive and grout would take it to 22-25kg.

My next thought is lining the wall with 9mm plasterboard, but there is no stud-work to mechanically fix to, it would have to be fixed with adhesive. This would be ideal and would be the easy way to provide a completely flat surface and allow for immediate tiling, however I’m unsure if an adhesive fix would be suitable.

Can anyone advise?

The other two walls are external walls, while ripping the tiles the render has come off in some areas. I plan to use some form of quick set s/c render to patch in.

I’ve attached a few pics of the same wall to help understand it’s current condition.

I would build a stud wall but I’m extremely tight for space, I’ve only got approx 20-25mm to play with and then it won’t sit flush with the door frame and also the bath will no longer fit.


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