Repair concrete wall after closet demolition

[Sunesdotter]

Hello.
(Unsure if the post ended up in the right group)
Today I tore down closets in the bedroom to then install ceiling and floor mouldings for sliding doors from Ikea and their elongated brackets that are attached directly to the wall to then hook on wire baskets, as well as have clothing rods. But first, I need to repair the wall as it was an old closet with thick, almost decimeter-long nails. What should I use?

I've also peeled off some of the wallpaper and when I pulled the loose parts, I also reached the concrete in some places. Can I use renovation wallpaper directly after sanding it a bit?

Grateful for help.

 

[pjkw]

It's probably plaster that has come loose, not concrete; I would have repaired it with gypsum plaster. However, there seems to be a seam where the wallpaper ends. Is the wallpapered surface something like a plaster wall or something? It will be difficult to prevent that seam from cracking. One option is to glue on a layer of gypsum on just that wall.

 

[Sunesdotter]

Okay... plaster mortar - noted! Thanks!
“Glue on plaster,” I need to read up on that, didn’t quite understand.🙈 Thanks for the response!🙌🏼☀️

 

[pjkw]

Well, it looks like it goes from a lightweight concrete wall with plaster to something like a drywall or something where the seam is. If you just apply filler (regardless of the type of filler), it will probably crack over time, so you need some kind of reinforcement. It could be a drywall sheet, but then you have to put drywall on the entire wall. Otherwise, something like a joint tape or renovation wallpaper after filling.

 

[Sunesdotter]

Yeah, so it looks like it goes from a lightweight concrete wall with plaster to something like a gypsum wall or something at the seam. If you just putty it (regardless of what type of putty) it will probably crack over time, so you need some kind of reinforcement. It could be a gypsum board, but then you have to put gypsum on the entire wall. Otherwise, like a putty strip or renovation wallpaper after puttying.

Ah, I see. Was considering the latter; puttying, putty strip, and renovation wallpaper on it.
Thanks a lot for the quick feedback.