Drywall on OSB boards, cracks?

I do not understand the whole discussion here. Is drywall (nowadays double-layered) on OSB not the standard for the "Holzständerbuden"? In our case, it was executed that way in 2009 (only 1x drywall) and tapes were applied to all transitions (wall/ceiling, wall/wall). Everything still looks great. Of course, the substructure is also decisive.

We have had this in our attic apartment for 8 years. Walls are OSB+GK on wooden studs, roof vapor barrier foil + GK. No wallpaper, everything is neatly spackled and painted. We only have slight cracks at the transitions between the brick exterior masonry and the wooden stud walls. But it is really not bad and you have to look very closely to see it.

8 years!
That's something.

I know, every house is different, but it is definitely NOT the case that it ALWAYS cracks.

Thanks Dali, I'm calm again (apart from the underlying Putin nervousness, but that's another story and doesn't need to be told here)

Standard is a cavity installation layer and the OSB/ESB exactly there on the wooden supporting structure. For summer thermal protection then min. 2 x 12.5mm GK.

In case of doubt, simply check the approvals of the GK manufacturer. They do consider these aspects to ensure quality.

Apart from that, today ESB boards are primarily available on the market, which may be listed as "OSB" in hardware stores. Wood, regardless of its form, always attempts to balance moisture.

Why one does not comply with summer thermal insulation in the roof, I will never understand, but as explained, the OSB board will absorb the water vapor. Depending on how much accumulates, the wood will start to swell, which can lead to cracks in the drywall.

With proper construction, this will not happen. In the picture, you can see that the OSB boards are installed as a vapor-tight layer and the joints are glued. This is also a completely acceptable method in timber frame construction to create a vapor barrier without foil. OSB3/4 is vapor-tight – it does not absorb anything.

great that you added something ...

in my research I read that OSB can be vapor-tight, or not, depending on the chosen quality.

I didn’t care at all and just trusted the architect and the carpenter ... now there’s a worm of doubt gnawing in the back of my mind. Did they really do it "right"?

Like you, Taschenonkel, my architect said OSB IS a vapor barrier. There was no mention that there are OSB boards that do not meet this condition ... and whether those were chosen or not ...
but you think they were "correctly" installed? (the adhesive tapes are for the insulation flakes that were blown in and shouldn’t come out at the joints)