Repair interior wall? (previous repair exists)

[tbgbg]

First, I want to clarify that I'm completely new to home repairs, so please don't use too technical language in your answers because I won't understand, thanks!

After removing all the wallpaper and moldings, I've discovered that I have quite a shabby part of an interior wall.

There's a previous repair that I believe is renovation plasterboard (at least a thin plasterboard) and filler. It's a bit unclear how large it is, but in the middle of the repair, at the height of the red edge, it sounds "hollow."

How do I go about fixing this?

Clean out everything loose and just fill it with housefix?
Knock it down so I can put plasterboard on the lower part as well?
Bring out the hammer and remove everything loose and the old repair and start completely from scratch?

Grateful for all the help and tips I can get!

 

[anders07]

Start by knocking loose everything and brush/vacuum clean (use a construction vacuum cleaner and not your regular home vacuum cleaner as it will soon break otherwise!).

You can use husfix but also gypsum plaster (e.g. https://www.hornbach.se/shop/Gipsputs-BAUMIT-25kg/7196557/artikel-detaljer.html). Mix it to a thickness like toothpaste approximately.
Use a plant spray to moisten the wall a little before applying the plaster and be careful not to apply too thickly as the plaster cannot be sanded down!

Finish with regular hand putty and sand it flat.

 

[tbgbg]

Start by knocking off all loose material and brush/vacuum clean (use a construction vacuum cleaner and not your regular home vacuum cleaner as it will soon break otherwise!).

You can use husfix but also plaster (e.g. [link]). Mix it to a thickness similar to toothpaste.
Use a spray bottle to slightly dampen the wall before applying the plaster and be careful not to apply it too thick as the plaster cannot be sanded down!

Finish with regular hand putty and sand it smooth.

So if I understand correctly, both husfix and plaster become very hard and are extremely difficult to sand down if applied too thickly?

When I googled, gypsum mortar also came up, is that an option?

 

[Stefan N]

Gypsum compound, gypsum plaster = Same same. Not particularly hard to sand.

 

[tbgbg]

Have tapped gently and poked out a lot of loose material and discovered that there seems to be some kind of conduit that becomes exposed, does this matter or is it just okay to proceed with house repairs/plastering?

 

[john.h]

Have gently tapped and removed a lot of debris and discovered that there seems to be some kind of wiring exposed, does this matter or should I just go ahead with house fixing/plastering?

That's how old radiator pipes can look, the black is insulation tied with wire. Could it be that you have that in the wall?

 

[tbgbg]

Old radiator pipes can look like that, the black is insulation tied with steel wire. Could that be what you have in the wall?

Yes, that might be reasonable, the house was built around 1961.

The wall to the left (in the photo from the first post is an exterior wall), and maybe that's why the wall has "cracked" there, due to the temperature difference?

And if they are radiator pipes, do I need to do anything special when I try to fix the hole?

 

[tbgbg]

Bumping the thread.

Is it just to go ahead despite potential radiator pipes or do I need to do something special?