Hi,
I have a basement where the outer walls were moisture-damaged when we moved in. We did the renovation three years ago, and I knocked off all the loose plaster. Then the project "fell asleep" somewhat due to having children, but now I plan to finish the basement. There are areas of 1-6 sqm and depths of 3-50mm that need to be filled/repaired. The drainage has worked very well, and we have no moisture penetration, but since these are outer walls, there is naturally always a certain pressure of moisture on them, and I'm wondering if gypsum plaster is suitable? Can anyone give me tips on what solution I should look for? For example, would Finjas Väggspackel 360 Vägg Rot work, or should I go for something else? I'm looking for what is easiest to work with, so the price can be secondary in this case. I have no experience doing this, but I want to learn, so I don't want to outsource it.
Any tips/thoughts are welcome.
/F
I have a basement where the outer walls were moisture-damaged when we moved in. We did the renovation three years ago, and I knocked off all the loose plaster. Then the project "fell asleep" somewhat due to having children, but now I plan to finish the basement. There are areas of 1-6 sqm and depths of 3-50mm that need to be filled/repaired. The drainage has worked very well, and we have no moisture penetration, but since these are outer walls, there is naturally always a certain pressure of moisture on them, and I'm wondering if gypsum plaster is suitable? Can anyone give me tips on what solution I should look for? For example, would Finjas Väggspackel 360 Vägg Rot work, or should I go for something else? I'm looking for what is easiest to work with, so the price can be secondary in this case. I have no experience doing this, but I want to learn, so I don't want to outsource it.
Any tips/thoughts are welcome.
/F
If the walls are damp, you want them to be able to breathe. My thoughts, therefore, are on either lime or K/C (Lime/Cement) render. Then it also depends a bit on what you plan to do with the walls afterward. Paint them? Put up tiles? Cover with an inner wall? (don't forget the ventilated air gap in that case).
Paint with chalk-based paint so they can breathe. No organic materials at all should be nearby. It's dry and nice now, but in 20 years when the drainage goes to hell, I don't want to have problems (although I probably won't be living there in 20 years, but you have to plan as if you would).
As I understand it, you still have the old plaster on certain parts of your wall. In that case, it's important to repair/plaster with the same type or "weaker" material. If you're not going to tile, lime plaster is likely the easiest for a beginner to work with, I think. I've only plastered with lime plaster and I liked it - you can work without stressing that it sets before you're done 
. It's never wrong to repair with lime plaster because it is the weakest and won't crack/damage the old plaster. It has a limitation in that it cannot support tiles. It has a great advantage - it quickly releases moisture and the walls look and feel dry despite moderate moisture migration through them. Very suitable in a basement that is troubled by ground moisture on wall surfaces close to the floor . I've tested it myself and been satisfied for 5 years now.
Start with a spot that isn't visible (as a practice field) and apply the plaster with a putty knife or a trowel. Throwing it on like the professionals do isn't the easiest and you'll just get annoyed that most of it ends up on the floor. Don't forget to moisten the wall first before you start plastering. In the end, you'll be surprised how easy it was and how nice it looks. You'll need to apply 50 mm of plaster in 2-3 stages.
It's easiest if you take a piece of plaster to a good building supply store and get help choosing the repair material.
Good luck!
gaia
. It's never wrong to repair with lime plaster because it is the weakest and won't crack/damage the old plaster. It has a limitation in that it cannot support tiles. It has a great advantage - it quickly releases moisture and the walls look and feel dry despite moderate moisture migration through them. Very suitable in a basement that is troubled by ground moisture on wall surfaces close to the floor . I've tested it myself and been satisfied for 5 years now.Start with a spot that isn't visible (as a practice field) and apply the plaster with a putty knife or a trowel. Throwing it on like the professionals do isn't the easiest and you'll just get annoyed that most of it ends up on the floor
. Don't forget to moisten the wall first before you start plastering. In the end, you'll be surprised how easy it was and how nice it looks. You'll need to apply 50 mm of plaster in 2-3 stages.It's easiest if you take a piece of plaster to a good building supply store and get help choosing the repair material.
Good luck!
gaia