I was planning to repair some walls in the basement where the plaster has come off, as well as replaster or skim coat the walls in a basement room.
I'm quite sure that the plaster on the walls I need to repair is lime plaster, so I planned to repair them with the same.
The house was built in 1945 and the basement walls are made of brick. The basement has been newly drained and floor insulated.
Now to my questions.
1. Is it true that you cannot paint with silicate paint on lime plaster indoors?
2. Are houses up to the 1940s both built and plastered with lime mortar? Or does the mortar between the bricks contain some cement mortar?
3. If I want to improve the brick joints in a basement wall and then skim coat the wall, which mortar is recommended for grouting and for skim coating?
4. From what I can see in the basement stairs, the plaster above ground level seems to be of a coarser type. Did they usually use finer lime plaster in the basement and coarser lime plaster above ground level?
Thanks in advance
I'm quite sure that the plaster on the walls I need to repair is lime plaster, so I planned to repair them with the same.
The house was built in 1945 and the basement walls are made of brick. The basement has been newly drained and floor insulated.
Now to my questions.
1. Is it true that you cannot paint with silicate paint on lime plaster indoors?
2. Are houses up to the 1940s both built and plastered with lime mortar? Or does the mortar between the bricks contain some cement mortar?
3. If I want to improve the brick joints in a basement wall and then skim coat the wall, which mortar is recommended for grouting and for skim coating?
4. From what I can see in the basement stairs, the plaster above ground level seems to be of a coarser type. Did they usually use finer lime plaster in the basement and coarser lime plaster above ground level?
Thanks in advance
Answer to question 2
It is likely that your house is both bricked and plastered with a KC mortar, meaning both lime and cement were used in the mortar.
Considering it was during the war, there is probably quite little cement.
A common mortar had 35% cement and 65% lime.
But it might be even less cement.
It is likely that your house is both bricked and plastered with a KC mortar, meaning both lime and cement were used in the mortar.
Considering it was during the war, there is probably quite little cement.
A common mortar had 35% cement and 65% lime.
But it might be even less cement.
Ok. I didn't think KC-bruk started being used until around 1950.
But in that case, kalkputs is preferable even for jointing, coating, or possibly plastering.
When I read online, I find many advantages of kalkbruk. But if it's so good, why are so many repairs and renovations done with KC-bruk and harder cement mortar today?
But in that case, kalkputs is preferable even for jointing, coating, or possibly plastering.
When I read online, I find many advantages of kalkbruk. But if it's so good, why are so many repairs and renovations done with KC-bruk and harder cement mortar today?
Have you seen any lime mortar at a regular building supply store?
It's probably best to use an air lime mortar for your repairs, but you need to go to a specialty store or order it to get hold of it. Expensive unfortunately...
I've seen how a hard mortar comes loose after a few years when done wrong...
It's probably best to use an air lime mortar for your repairs, but you need to go to a specialty store or order it to get hold of it. Expensive unfortunately...
I've seen how a hard mortar comes loose after a few years when done wrong...
I have bought lime mortar at both K-Rauta and Bolist. I think it cost 125:- for 25kg last time.Eld said:
Regarding the questions:
1) I was recommended not to use silicate paint on my lime plastered walls. I used lime paint that I mixed myself, a bit messy to work with but very cheap.
2) My basement from -49 is built with concrete hollow blocks and lime mortar.
Thank you for your answers
Eld: What is the difference between kalkbruk and luftkalkbruk?
scim: Regarding kalkfärg, does it release kalk and stain if you touch it? Can it be obtained in other light colors besides white (like beige)?
Eld: What is the difference between kalkbruk and luftkalkbruk?
scim: Regarding kalkfärg, does it release kalk and stain if you touch it? Can it be obtained in other light colors besides white (like beige)?
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