Plaster or board?

[Gabsson]

Was just going to touch up a bit but everything fell down. Debris everywhere.
The surface is about 3-4 square meters. The substrate is lightweight concrete. Not insulated on the outside.

Re-plaster or does a board like gypsum work?

 

[KnockOnWood]

Putsa om eller funkar skiva typ gips?

I would probably glue up a gypsum board or two.
Much easier to get a nice inward surface for an "amateur".
There are construction adhesives that you just squeeze out onto the wall with a caulking gun, and then press the gypsum board in place.

 

[Gabsson]

No risk that the gypsum board's paper will be damaged by moisture from the lightweight concrete? On the outside, the lightweight concrete is only plastered and painted, so some moisture seeps in.

 

[Gabsson]

 

[Gabsson]

I guess I have to polish around the wood details here?

 

[Gabsson]

I'm still leaning towards plastering to get it nice around the woodwork.

I first bought Finja "Laga vägg".
Will this work or do I need to deal with coarse plaster (c-finish) and then surface plaster (b or a-finish).

Would fix work? Like what you use under tiles. Or would this be too hard? I preferred plaster that doesn't crack with movement.

 

[Gabsson]

Update. Chose to plaster with gipsputs and it was really easy. Coarse plaster and an additional layer. Lastly, a layer of wall filler to make it completely smooth.

 

[Gabsson]

This is how the last layer of plaster turned out.

 

[Gabsson]

Final:

 

[ptk]

Did you need to prime for gipsputs? With what?

 

[Gabsson]

Did you need to prime for gypsum plaster? With what?

No primer because the substrate (aerated concrete) is absorbent. However, you must pre-wet the substrate before, otherwise there is a risk the gypsum plaster will detach when it dries. If the substrate is very smooth or needs dust binding, you must use a primer. According to Finja's advice.