MarcomitZeh
2025-09-13 07:12:12
- #1
Hello everyone,
at my single-family house built in 2004/2005, the first irregularities in the plaster are slowly becoming apparent. The exterior wall of the building consists of aerated concrete, and the columns are also glued aerated concrete. According to the documentation, a "colored stone plaster No. 900 with a grain size of 3 mm" has been applied in the base area, and on the house wall a "Terrastar 222 light scratch plaster 3 mm". Specifically, I am concerned with two different situations:
1. In the entrance area, there is a tiled stair landing, covered by a porch that stands on two columns. On one of the two columns, the plaster has bulged at a corner and flaked off – oddly on the inside of the pillar, i.e., towards the center of the stair landing, not outward towards the weather side. As can be seen in the photos, there is a reinforcing mesh under the top plaster. With a cutter knife, I can carefully cut around 3 cm under the top plaster all around, so the plaster is loose there as well. The fact that the plaster bulges up like this argues against my first assumption that someone simply bumped something against the pillar; apparently, there are other causes. Splashing rain is also not necessarily a plausible explanation due to the interior location of the spot… What causes could the flaking have, and what does a professional repair look like here? This is the only spot on the entire house where the plaster has bulged like this. (There is another fingernail-sized plaster flake at another spot on the house, at a corner, but that is clearly of mechanical origin and, I think, can simply be replastered without any problem.)
2. At the transition between the ground floor and the upper floor, there is a horizontal crack in the plaster. This can be seen in several places around the building, sometimes quite noticeable, sometimes hardly visible, always at exactly the same height. To me, it looks as if the building itself has shifted here. The ceiling between the two floors is 20 cm reinforced concrete. The cracks themselves are very thin, just hairline cracks, but it is visible that the plaster is detaching here – probably due to water running under the plaster? What causes can lead to the formation of hairline cracks, and does anything need to be repaired here? If yes, what does a professional repair look like?
Thank you very much, and best regards,
Marco
at my single-family house built in 2004/2005, the first irregularities in the plaster are slowly becoming apparent. The exterior wall of the building consists of aerated concrete, and the columns are also glued aerated concrete. According to the documentation, a "colored stone plaster No. 900 with a grain size of 3 mm" has been applied in the base area, and on the house wall a "Terrastar 222 light scratch plaster 3 mm". Specifically, I am concerned with two different situations:
1. In the entrance area, there is a tiled stair landing, covered by a porch that stands on two columns. On one of the two columns, the plaster has bulged at a corner and flaked off – oddly on the inside of the pillar, i.e., towards the center of the stair landing, not outward towards the weather side. As can be seen in the photos, there is a reinforcing mesh under the top plaster. With a cutter knife, I can carefully cut around 3 cm under the top plaster all around, so the plaster is loose there as well. The fact that the plaster bulges up like this argues against my first assumption that someone simply bumped something against the pillar; apparently, there are other causes. Splashing rain is also not necessarily a plausible explanation due to the interior location of the spot… What causes could the flaking have, and what does a professional repair look like here? This is the only spot on the entire house where the plaster has bulged like this. (There is another fingernail-sized plaster flake at another spot on the house, at a corner, but that is clearly of mechanical origin and, I think, can simply be replastered without any problem.)
2. At the transition between the ground floor and the upper floor, there is a horizontal crack in the plaster. This can be seen in several places around the building, sometimes quite noticeable, sometimes hardly visible, always at exactly the same height. To me, it looks as if the building itself has shifted here. The ceiling between the two floors is 20 cm reinforced concrete. The cracks themselves are very thin, just hairline cracks, but it is visible that the plaster is detaching here – probably due to water running under the plaster? What causes can lead to the formation of hairline cracks, and does anything need to be repaired here? If yes, what does a professional repair look like?
Thank you very much, and best regards,
Marco