ᐅ Drywall installation of interior corners

Hello everyone,

Our house is about to be plastered soon, and I am wondering about the best way to finish the interior corners.

Here’s the current situation:

House wall: timber frame construction wall with internal insulation. Exterior walls are covered on the inside with an OSB board, then another timber frame, and drywall on top (serving as an installation level for all the technical systems). Interior non-load-bearing walls consist only of framing, insulation inside, and drywall on top. Knauf Diamant drywall boards will be used on all walls, with standard Knauf boards on the ceilings. Afterwards, a smooth fleece wallpaper will be applied everywhere. The drywall panels are already installed. The plastering will be done using a system like Uniflott.

Now the question is, what is the best way to finish the interior corners during plastering?

1) Simply plaster them
2) Apply joint tape, like Kurt from Knauf, and then plaster
3) Use acrylic sealant in the corner?
4) ???

I have been researching this for a while, and it seems to be somewhat of a philosophical question. Still, I believe these corners should be finished “correctly,” and there should be some kind of standard regulation for this.

How is this usually done when done properly and without shortcuts?

Thank you in advance.

I also trusted the professionals with my timber frame construction and had them finish all interior corners without joint tape or only with acrylic. The result was cracks everywhere at wall-to-ceiling transitions.

Use joint tape for everything, or at least for all areas that are likely to experience movement. It’s not guaranteed to be crack-free, but it will definitely be better than doing it without any tape.

Of course, it’s also possible to do it without tape first and then add the joint tape after 2–3 heating seasons (which is what I plan to do). This way, you can be sure that all major settling has occurred.

By "strip" I meant something like this:

After two to three heating seasons, it won’t be possible to install this. It needs to be done beforehand.

Yes, it works perfectly. It is also intended, among other things, for repairing cracks according to Knauf (see K442a). Of course, it still needs to be filled and painted.

There are different options. I have personally used Kurt so far and have never had cracks in the corners. However, you can also simply apply regular joint compound and make a small cut. At some point in the near future, once the movement in the house has settled, you might have small or wider gaps in the interior corners instead of cracks. But these will be neat and straight, since you have a joint. You then fill this joint with an appropriate sealant (a good hybrid sealant for indoor use or standard acrylic).