Which plaster should be used? What are the differences?

Hello.
Soon the plasterers will arrive at our new build.
Since we want little wallpaper and tiles on the walls, we have now decided on the gypsum plaster from the selection offered by our developer (cement plaster and gypsum plaster). Due to its smoother surface, it should be better suited for our project. According to the developer, the whole house can only be treated with one type of plaster. So the bathrooms cannot switch to cement plaster.

My question now is:
Is gypsum plaster automatically always lime gypsum plaster? If not, what are the differences between lime gypsum plaster and gypsum plaster? Only the mold-inhibiting effect of the lime?

In addition, it is important to us that no moisture can penetrate through the plaster. Is this given with all types of plaster? Cement plaster at least absorbs moisture and releases it again. But that would mean moisture passes through the plaster, right? We are concerned about the stone wool behind the plaster. In some places, the moisture seal is only ensured through the combination of plaster and vapor barrier. Or would you recommend a completely different plaster? What do you think of gypsum plaster in the bathroom? A controlled ventilation system with heat recovery is present.

A bathroom is not considered a wet room (as long as there is no pool or sauna), therefore gypsum plaster is permitted there. In order for it to absorb moisture, you must not use simple paint (if not tiled), first prime and then use a dispersion-silicate paint (vapor-permeable). Rock wool directly behind the plaster? Without drywall? Where is that supposed to be?

Alright. Is gypsum plaster always lime gypsum plaster? Of course, we have just finished the drywall construction. However, some cables and empty conduits, for example, go over the knee wall to the foil. The transition there always had to be slit. In my assessment, the foil is not 100% sealed in some places there. Partly, three empty conduits 40x40mm run side by side into/on the foil.

According to the developer, the entire house can only be treated with one type of plaster. So it is not possible to switch to cement plaster in the bathrooms.

Behind this statement lie calculative and organizational reasons. Technically, of course, this is not a problem.

Is gypsum plaster automatically always lime gypsum plaster? If not, what are the differences between lime gypsum plaster and gypsum plaster? Only the mold-inhibiting effect of lime?

Is gypsum plaster automatically always lime gypsum plaster?

No, gypsum plaster without lime content is cheaper.

If not, what are the differences between lime gypsum plaster and gypsum plaster? Only the mold-inhibiting effect of lime?

It is mainly the mold-inhibiting effect. Lime plaster is also available based on cement; this would be better suited for a bathroom since cement does not tend to swell. In a bathroom in a private household, I would have no concerns about using simple gypsum plaster, as it is not a permanently wet room. Additionally, there are sealants that prevent water absorption and can be applied locally. We used clay plaster, which is also said to have a pollutant-reducing effect and neutralizes odors excellently. The material is a bit more expensive, but the money can easily be recouped by foregoing the often expensively sold wall smoothness suitable for grazing light.

Thank you for the feedback. How does it behave with moisture permeability? We tore up the ar... to ensure the vapor barrier is tight. Unfortunately, the electrician played wild west afterwards. As far as I understand now, the sealing is rather achieved by the later coating? Or is the plaster itself already tight?

Or is the plaster itself already watertight?

Sealing the plaster on the surface is quite a shame, as it abandons the special properties of this building material.