Suspending a drywall ceiling

Hello,

my bathroom is currently being renovated. This morning I saw that the company got "normal" grey boards
gypsum plasterboard KNAUF GKB.

The ceiling will be suspended throughout the bathroom, including over the shower with water vapor etc.

As a layman, I naturally think that it is wrong, because the "green" boards belong in the bathroom. Another craftsman, who was there briefly this morning, said the same.

On my way to work, I happened to meet a bathroom renovation company at the bakery. I also asked them briefly :)
They also said it's nonsense, that the green ones belong there.

I explained the situation to my craftsman and he said he always uses these boards, he doesn’t need the impregnated ones because they are sealed with PCI Gisogrund.

I then called Knauf and PCI to get information. The specialists there said that it works that way. They were also very focused on standards and regulations.

Should I now stop the construction process in the bathroom?

You pay for everything. Do you have a good feeling about it?

Of course, green plates belong in there. Gisogrund also goes on, as usual.

In bathrooms, impregnated (green) panels are to be used. In double cladding, only the outer layer is installed as impregnated. The surfaces that will be tiled afterwards are primed.

...I join everyone who says they should take the green ones, they cost only a few € more for the few m². Otherwise, you will always worry about them...

I (not an expert) have heard that the green ones are only REQUIRED to be installed in "wet rooms." A private bathroom, on the other hand, is not considered a wet room. Maybe you should get some information on that. However, I always install green boards in the bathroom, guest toilet, and kitchen. It costs a few euros more, and I think I did it "right/better" :-)