ᐅ Pre-fabricated basement – Filling in corners

Hello, we have built a prefabricated basement and I plan to start the plastering work eventually. I have a question about the internal and external corners:

How would you plaster the internal corners (the typical room corners)? Currently, they are filled with foam. Would you embed a corner bead here or just seal it with acrylic?

We also have an external corner. The concrete wall is chamfered here. Are there corner beads designed for embedding in this case?

Thanks in advance for your answers.

Hello,

do you have pictures? Why is it foam?

I don’t have any pictures on hand right now. I need to take some. Why is there foam inside? Because the contractors sealed the joints like that before pouring the concrete…

Hello,

You mentioned a basement? Is it a waterproof concrete (WU) basement?
In my opinion, spray foam has no place there.

I will wait for the pictures.
Thank you.

Ok, I think you can see it quite clearly here.

The foam doesn’t expand all the way up the entire height of the basement AND penetrate from the outside to the inside, does it???