Knock off anything that isn't firmly attached and redo the plastering
Exactly. Don't be discouraged, it always looks like a bomb site when you've torn down, but plastering is easy, you learn quickly. Mixing plaster is as simple as mixing waffle mix, for example. Don't forget to wet the wall thoroughly with a damp sponge so it doesn't absorb all the moisture from the plaster. Buy a wide putty knife and a narrow one, and you'll get it done easily. You can take a piece of plaster with you to the store to get the right hardness, or you can use husfix, which is actually a bit too hard but works when the areas aren't too large. Good luck, take pictures and update us afterwards.
If it is lime plaster, don't take anything harder. I think if it's an older house, air lime mortar is the right choice... Gypsum can perhaps work in a pinch and is much easier to plaster with. According to my experience, Husfix is too hard and very expensive compared to lime plaster. Don't take anything cement-based, kc, if you're not sure that's what it was before - in the pictures, it looks like lime mortar.
I must agree with this. If you can scrape off the plaster with your nails, it's lime mortar and then it's best to use it again. Then I think it might be a bit daunting for a novice to buy a large sack of C-mortar or similar at the hardware store, whereas it really should be the opposite. It's a shame that C-mortar isn't sold in a small box just like Husfix, but maybe it is?
Nah, it's probably a bag that's needed. But it costs almost nothing, and after all, you need quite a bit for repairing that. But it should be noted that Putsbruk C is not a pure lime mortar. If you want a pure lime mortar, it's called just kalkbruk. Then, of course, there's the question of whether to use hydraulic kalkbruk or not.
Thanks for all the answers!
Our friend who is going to help us with filling and painting the room thought that it would be enough to fill the holes with plaster filler. Are we completely off track then?
Our friend who is going to help us with filling and painting the room thought that it would be enough to fill the holes with plaster filler. Are we completely off track then?
Gypsum works, and it's convenient. There's not much to attach to, but you're just putting up a baseboard, so it doesn't really matter. Take the chance to hide cables and such in the wall while you're at it.
Gypsum plaster is what I've used; maybe it's the same as gypsum filler. However, gypsum plaster is harder, but I think it works if it's gone next to the substrate. Just applying a few mm of gypsum, I believe there is a risk that it's so hard that the lime underneath comes off.