Paramount partition plasterboard damaged

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Hi all,
After removing my bath and the tiles above it. I’m left with damaged and muck covered plaster. The wall is a paramount stud that backs onto the main bedroom. once the new bath is fitted, it will be re tiled.

upload_2020-11-17_22-22-16.jpeg



To prepare for tiling, Im thinking remove the bathroom side plaster and the cardboard between the sheets. Put some noggins in and then put a tile backer on instead of plasterboard.
I know the internal cardboard honey comb is there for structure so removing it will compromise the bedroom side. When I add the noggins, can I glue it to the back of the bedroom side of plaster board, as well as screws into the stud frame.

maybe I should fit and dab over it?

Any other suggestions would be welcome.

Many thanks for your help.
 
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sounds like a faff. what about a 2x2 stud ,fixed to the floor and ceiling and bonded centrally to your existing paramount wall for rigidity. then wedi or marmox or similar lightweight tile backer.
 
That's how I deal with paramount walls if needed. Remove all cardboard and build a new frame in between before boarding over. You'll be able to get the new wall bang on flat and plumb too. I use low expansion expanding foam to bond the back of the studwork to the remaining plasterboard. Studwork centres will change depending on thickness of boards used, 10mm board = 300mm, 12.5mm = 400mm, 20mm = 600mm.
 

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