Well, it seems like the builders have made a mistake...
We have aerated concrete walls in the basement level. The walls are built with 30 cm thick blocks and are painted with plaster externally. Internally, they are also plastered.
When we bought the house, the previous owners had grown tired of their wallpaper becoming yellow-spotted, so they had put up a moisture-proof wallpaper (completely airtight) with the result that moisture got trapped inside the wall, causing most of the plaster to come off.
I have removed the wallpaper and chipped away all the loose plaster, and then the builders were supposed to re-plaster the wall and paint with silicate paint.
Now it turns out they have re-plastered the wall but then applied regular joint compound for smoothness. Since only one wall in the room is an exterior wall, I had instructed them to paint with silicate paint on that wall and about 1 meter onto the adjacent walls, and then use regular wall paint for the rest of the room.
They have painted two coats with the silicate paint as instructed but thought it didn’t match the color of the rest of the walls (silicate paint is not as glossy), so they painted a layer of regular wall paint over the silicate paint...
So, now I have regular joint compound on the plaster and a layer of regular wall paint on top of the silicate paint... Is there any chance this will hold up, or will the plaster fall off again after a while?
The wall is damp, and water seeps into it from cracks externally between the upper concrete floor and the wall, so it needs to allow moisture to pass through...
Best regards,
Anders
We have aerated concrete walls in the basement level. The walls are built with 30 cm thick blocks and are painted with plaster externally. Internally, they are also plastered.
When we bought the house, the previous owners had grown tired of their wallpaper becoming yellow-spotted, so they had put up a moisture-proof wallpaper (completely airtight) with the result that moisture got trapped inside the wall, causing most of the plaster to come off.
I have removed the wallpaper and chipped away all the loose plaster, and then the builders were supposed to re-plaster the wall and paint with silicate paint.
Now it turns out they have re-plastered the wall but then applied regular joint compound for smoothness. Since only one wall in the room is an exterior wall, I had instructed them to paint with silicate paint on that wall and about 1 meter onto the adjacent walls, and then use regular wall paint for the rest of the room.
They have painted two coats with the silicate paint as instructed but thought it didn’t match the color of the rest of the walls (silicate paint is not as glossy), so they painted a layer of regular wall paint over the silicate paint...
So, now I have regular joint compound on the plaster and a layer of regular wall paint on top of the silicate paint... Is there any chance this will hold up, or will the plaster fall off again after a while?
The wall is damp, and water seeps into it from cracks externally between the upper concrete floor and the wall, so it needs to allow moisture to pass through...
Best regards,
Anders
The plaster will probably hold, but the paint will peel off.....
That's what I was afraid of... 
The company I've been using has been very good, but towards the end, some extra resources have come in that don't really have a good grasp of either Swedish or English... The painter apparently wanted to do a good job and not leave a slightly rough matte wall, so he made the decision to fill and paint with the same color as the rest of the room...
We've considered different options, but since there's plaster behind it, it hardly seems possible to sand away all the filler, and with two layers of silicate paint and one layer of regular wall paint, it's not much fun to get down to the filler...
The company has promised to write an extra guarantee and come fix the wall when it starts to peel or flake...
It also feels a bit annoying to spend 600 bucks on silicate paint only to have it painted over...
//Anders
The company I've been using has been very good, but towards the end, some extra resources have come in that don't really have a good grasp of either Swedish or English... The painter apparently wanted to do a good job and not leave a slightly rough matte wall, so he made the decision to fill and paint with the same color as the rest of the room...
We've considered different options, but since there's plaster behind it, it hardly seems possible to sand away all the filler, and with two layers of silicate paint and one layer of regular wall paint, it's not much fun to get down to the filler...
The company has promised to write an extra guarantee and come fix the wall when it starts to peel or flake...
It also feels a bit annoying to spend 600 bucks on silicate paint only to have it painted over...
//Anders
It seems like you are right... a 10x10 cm spot has already peeled off and I see bubbles in several places...
This wall seems to be constantly getting wet. Can some form of "protection" be applied externally, like aqua-board or similar?
//Anders
This wall seems to be constantly getting wet. Can some form of "protection" be applied externally, like aqua-board or similar?
//Anders
Why is the wall constantly wet?
There are cracks in the plaster on the outside where rain might be getting in, I believe. The crack runs horizontally along the entire wall where the slab for the upper floor sits on the wall (concrete slab). It is an exterior walkway from the back of the house to a balcony that forms a roof over part of the room where the problem is below.
It could also be the waterproofing layer (asphalt layer) under the tiles on this walkway that is leaking, I suppose...
The wall is only partially below ground level and is drained with Platon on that part, but it is the part above ground that is wetter.
I've tried sealing the crack with outdoor latex, but water still seems to be getting into the wall, so I'm starting to lean more toward a problem with the walkway...
//Anders
It could also be the waterproofing layer (asphalt layer) under the tiles on this walkway that is leaking, I suppose...
The wall is only partially below ground level and is drained with Platon on that part, but it is the part above ground that is wetter.
I've tried sealing the crack with outdoor latex, but water still seems to be getting into the wall, so I'm starting to lean more toward a problem with the walkway...
//Anders