I am going to repair some plaster that has come off our chimney breast in the kitchen. When I knocked off some loose plaster, it turns out there is a hole in one spot. Can I just put in some extra plaster mix there, or should I fill it with concrete or something similar first?
How old is the house? If you can crumble the plaster between your fingers, it's probably plaster made with lime mortar and you should continue with that. Cement becomes rock hard and does not crumble in the same way.
No concrete there!
Just keep plastering. Possibly use mesh to prevent it from coming off again; it is most likely the crack that caused both the plaster and brick joint to come off. Then you can certainly consider why it cracked like that.
The house is from '62. It's easy to crumble the mortar, so is it lime mortar then? I'll have to go and exchange the sack of cement-based mortar that I bought. Or is it okay to mix if you're less meticulous? I'm going to wallpaper the wall afterward, so differences in texture and such will be covered up anyway.
That particular stone in the picture blocks the hole between the fireplace on the left and the chimney on the right. Since it's not a load-bearing part, that row was probably installed a bit carelessly.
One should never mix different types of plaster, but if you are less meticulous, I am convinced that it will work with c-bruk for that small area
It has nothing to do with the structure, but rather that the cement plaster might move differently and crack or shear the lime plaster off the wall.
Now it's polished and done.
Ugh, it was so complicated, cumbersome, and miserable. I think it was hard to get adhesion, and even worse trying to scrape off the polish to align it with the rest. I was expecting something like thick or coarse filler, but that was a completely wrong assumption.
I'm betting that in two days I'll be back here crying because all the plaster has fallen off.
It was so complicated, cumbersome, and miserable. I found it difficult to get adhesion, and even worse trying to remove the plaster so it blended with the rest. I had expected something like thick or coarse putty, but that was completely wrong assumption.
Wrong technique
If you want something that works a bit more like putty, I can suggest using gypsum plaster next time.
But the result was great!
Mjo.
For once, I can admit that it's my lack of skill. But don't tell my wife that I admit such things.
I might as well mention that I went to the building supply store and switched to lime mortar so it's only my fault if it falls down. In a few days, when it has dried, I'm planning to put up renovation wallpaper so I can smooth out the final unevenness.
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Janus82 said: