I found this information:
https://www.gvk.se/fragor-och-svar/...d-kartongyta-som-underlag-for-fukttalig-skiva

Does this mean that I can use normal gypsum in my bathroom so long as I make sure that teh waterproof system is done properly. So for instance I could use this gypsum:
https://www.byggmax.se/gipsskiva-p07524

And then use the Biltema waterproof system:
https://www.biltema.se/bygg/vvs/sanitet-och-vatten/vatrum/tatskikt/tatskiktssystem-f/

I would tile zone 1 areas and 1 m beyond. The shower would have a tray and be enclosed.
 
T
If you are confident that the Biltema system is up to the task and that you are able to install it according to every specification the GVK webb page says it should be OK.
On the other hand, how much more will it cost to use a waterproofed sheet material and how much is that of the total cost? Is it "worth it" if you get a water damaged bathroom? If you have to tear down the bathroom and do it again i n a few years because you save that amount now, you will not be happy. :)
 
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