wall prep behind fibo wetwall panels.

[gaz_moose]

it looks like im going to be using fibo marble tile effect panels in my bathroom refurb but im unsure on what to do with the actual walls. ive seen a few Fibo installation guides and they recommend screwing the boards to the walls on the joining parts of the boards. my walls are currently plastered over regular plasterboard and tiled, so im sure they will be ruined when i chip all the tiles off.

if i was tiling the new bathroom i would use tile backerboard and a tanking kit but am unsure what to with these wet wall panels.

 

some of the youtube video guys just bond them over whatever is left of the original walls, some of them replace the walls with wood and bond and screw,  obviously this is in my own house so i want it to be done correctly.

what have you guys done to your walls before attaching wetwall panels?