Porous/poor wall, lightweight concrete. Fill or plaster on top?

[Snajder]

I just removed a built-in wardrobe and behind it was a lightweight concrete wall that was very poorly made, as you can see in the photo, it is very cracked/partly hollow. I'm going to place a wardrobe there that will cover the entire wall, and from the other side, the wall is fine. It feels very cumbersome to fill all these holes with house fix... Since I'm going to have a large wardrobe that will cover the entire wall, I was thinking of using renovation drywall with some kind of adhesive there instead. What do you think is the best option?

 

[slacker]

I would personally spray/brush on primer, buy a bag of gipsbruk, roughly apply it, finish with sand filler, sand, and paint.

Gipsbruk has its advantages over husfix - Cheaper, easier to work with, and it can be sanded down, removed if there's too much...

 

[MathiasS]

...but when you see the cracks starting to appear in the joint compound, you'll curse yourself for cutting corners.....

How about fully gluing a root-gips?

 

[Snajder]

What is a root cast?

 

[petrho]

What is a rot-gips?

rotgips=renoveringsgips (i.e., thinner gypsum board)

 

[Snajder]

rotgips=renoveringsgips (i.e. thinner plasterboard)

Ah, my thought.. Since the whole wall will be covered, I figured it should be enough, it's not something that will be visible and there's no load there at all.
Should you spray something like adhesive spray on it first to keep any loose pieces still or does it not matter?

 

[petrho]

Ah, my thought.. Since the entire wall will be covered, I thought it should be enough, there's nothing that will be visible and no load there at all.
Should I spray something like adhesive spray first to keep any loose pieces still or does it not matter?

Personally, I've glued rotgips on most walls (siporex/ytong). Used PL600 which holds well. It might be appropriate to temporarily use some drywall screws (unscrew and fill them when the glue has dried).

 

[MathiasS]

I would glue with tile adhesive or another more suitable gucka since the wall is so damaged......

 

[slacker]

...but when you see the cracks start appearing in the plaster, you'll curse yourself for cutting corners...

How about gluing up a rot-gips?

I don't know how many walls I've repaired in apartments with plaster over the years and I can say that none have tended to crack. On the other hand, putting up ROT gips over the entire wall, getting it perfect, even, and smooth without any hollow sound behind the board is a project like no other, in my opinion - Plaster all the way for me.
Plaster for indoor repairs is not even close to cutting corners, it's darn well harder than the old render on the walls!

It is possible to screw into lightweight concrete, so if you're putting up plasterboard, I would try using slightly longer drywall screws for wood framing and see if they hold in the wall. If it works, it would make setting the board much easier... if you're thinking of going that route...