How should I fill large holes in a masonry wall?

[Jonasåkesson]

I am renovating a cottage where a brick interior wall was decorated with stones set in holes in the wall. I have removed the stones but am wondering how best to restore the wall now.

Firstly, how do I fill in the holes that are about 0.5-1 dm deep and 3-5 dm wide?

Secondly, what do I do with the entire wall afterward to make it smooth?

Attaching some pictures and hoping for advice!

 

[mexitegel]

Patch the holes with plaster. You will need to apply it in multiple rounds since it's not possible to apply such a thick layer at once. Before plastering, moisten the cavity with water using a spray bottle so the dry old plaster doesn't suck all the water out of your new plaster, which would weaken it.

Then it depends on the surface you want for the wall. If you want to keep a brick surface, you might need to smooth the surface with plaster; otherwise, one option is to glue gypsum board on the wall, which you can then paint or wallpaper.

For the stove/chimney, I assume you continue with a brick surface?

 

[Stefan1972]

If it's a brick and then plastered wall, it's probably easiest to just plaster the holes again. Especially if you intend to have a plastered wall. It doesn't look rock hard, and if it's soft, it's some form of lime mortar, which is really easy to work with. It can be shaped and brushed even as "hard." This is in contrast to cement mortar, which becomes rock hard.

 

[Plupp 405730]

I am renovating a cabin where an interior masonry wall was decorated with stones set into holes in the wall. I have removed the stones but wonder how best to prepare the wall now.

Partly how to fill in the approximately 0.5-1 dm deep and 3-5 dm wide holes.

Partly what to do with the entire wall afterward to make it even.

Attaching some pictures and hoping for advice!

Hi,

Is it aerated concrete I see?
Plastering aerated concrete is a bit trickier than regular bricks/concrete or leca, the general rule is that you need to use low-alkaline mortar; I am attaching a link to a suitable one. Follow the recommendations on the sheet and you will go far.

Regards, Janne

https://www.beijerbygg.se/wcsstore/...s/86/PDS-SE-weberbase_131_lttbetongputs_C.pdf

 

[Jonasåkesson]

Thanks for the response! How do I know if it's aerated concrete? The house was built in '59 if that's a clue?

Reading that gypsum plaster works on aerated concrete and can be applied in thick layers, could that be a good option?

(Want to continue having plastered surfaces on both the wall and chimney)

 

[Plupp 405730]

Thanks for the response! How do I know if it's lightweight concrete? The house was built in '59 if that's a clue?

I read that gypsum plaster works on lightweight concrete and can be applied in thick layers, could that be a good option?

(I want to maintain a plastered surface on both the wall and the chimney)

Gypsum plaster won't look like the plastered surface does.
I can't determine for sure if it's lightweight concrete from the pictures.
But if you want to be sure, assume it's lightweight concrete, then you won't go wrong regarding which plaster to use.