A few years ago we had all our walls replastered inside and out because the plaster was bad, and painted with non breathing latex wallpaint. The inside walls were done with a special breathing plaster (MuroSeco by Kerakoll). That worked very well. Still, we have some weird damp spots on the inside of the walls, below ground level.
Like the stairs to the cellar:
And in the lavatory downstairs that is below ground level, too:
Those spots don't really change, and they don't disappear either.
Inspected the lower side of the walls outside: especially where the toilet is located there is a jostle stone (click link), and there were seams between plaster of the wall and the pavement, and the jostle stone. Gaps quite big enough to let rain water that comes down the walls enter between wall and pavement, down the wall!
Same for the wall outside the cellar stairs. Gaps up to 1 - 2 mm!
Engineer Jansen still has a full bag of 15 kg Sikalastic 127 that he used 6 bags of on the roof. He now has 14 kg left.
A 2 cm band of waterproofing was applied along the bottom of all walls and onto the pavement and terrace:
It will take time to know if this has fixed it. Years probably.
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