How to plaster on damaged plaster

[nalli]

No, but it might be easier to apply fiber cement boards and then plaster on them... That way you know it will hold.

I think the plaster looks a bit too sharp/stiff to be lime plaster, but it's hard to say for sure from the pictures.
It could be lime plaster initially and someone has repaired it with cement mortar which is why it falls off.

 

[nalli]

Collapsed masses, tips?

 

[Plupp 170696]

Collapsed a lot, tips?

Clear away everything loose and do a test to see if you can solve it yourself or if you need to hire someone.

Has the chimney been inspected and approved?

 

[nalli]

Clear away all loose material and do a test to see if you can resolve it yourself or if you should hire someone.

Has the chimney been inspected and approved?

I don't think the chimney is supposed to be used

 

[Plupp 170696]

I don't think the chimney should be used

It's a beautiful kakelugn you have for it, so think about it a little.

 

[Plupp 170696]

Don't forget to moisten properly before polishing and keep it moist for a few days afterward, which is what I have been taught, no link unfortunately...

 

[cpalm]

A lot collapsed, tips?

Continue to remove all loose "pieces," leaving only what is homogeneous. Pieces that are loose unfortunately can't be saved even if they are "wedged in." Is it just mortar, or are entire stones coming loose? It's a bit hard to see, but it looks like it might be a natural stone wall rather than bricks? If stones are starting to fall, it might be time to call someone with more experience.

It also starts to look like clay mortar(?). Do you feel you've reached a new "layer"? Clay mortar can be dissolved in water and reused if that's the case.

 

[nalli]

Don't forget to moisten properly before polishing and keep it moist for a few days afterward, which is what I have been taught, unfortunately, no link...

Thank you for all the tips and patience ☺️

 

[nalli]

Continue removing all loose "pieces," leaving only what is homogeneous. Pieces that are loose unfortunately aren't worth keeping even if they are "wedged." Is it just mortar, or are whole stones coming loose as well? It's a bit hard to see, but it looks like it might be a natural stone wall rather than bricks? If stones are starting to fall, it might be time to call someone with more experience.

Now it also looks like clay mortar(?). Do you feel like you've reached a new "layer"? Clay mortar can advantageously be dissolved in water and reused if that's the case.

Thanks for all the tips and patience ☺️