Hello everyone,
Our house was built in 2020 with Poroton blocks (42.5cm (17 inches), no external insulation system) and plastered. I don’t have more specific information about the plaster.
On the west side, we can see stains on the damp exterior wall, and the joints are also slightly visible. On the dry wall, the stains are hardly noticeable. Other exterior walls, either on our house or at neighbors’, show no abnormalities.
I understand that plaster can develop mold over time. However, I am surprised why the stains are only so noticeable when the wall is wet. Could the plaster be too thin, causing the masonry to “show through”?
I have an appointment with the builder soon, so I would appreciate your neutral opinions. Thank you!



Our house was built in 2020 with Poroton blocks (42.5cm (17 inches), no external insulation system) and plastered. I don’t have more specific information about the plaster.
On the west side, we can see stains on the damp exterior wall, and the joints are also slightly visible. On the dry wall, the stains are hardly noticeable. Other exterior walls, either on our house or at neighbors’, show no abnormalities.
I understand that plaster can develop mold over time. However, I am surprised why the stains are only so noticeable when the wall is wet. Could the plaster be too thin, causing the masonry to “show through”?
I have an appointment with the builder soon, so I would appreciate your neutral opinions. Thank you!
The cause – at least from my perspective – is that it was done "as cheaply as possible." Understandable and initially just a little "unwise."
One important detail I consider is:
Does it have technical consequences that worsen over time?
As long as the issues are only cosmetic, you can live with it.
If there are effects on the structure, something should be done.
One important detail I consider is:
Does it have technical consequences that worsen over time?
As long as the issues are only cosmetic, you can live with it.
If there are effects on the structure, something should be done.
X
xMisterDx16 Oct 2022 10:19There is an external thermal insulation composite system (ETICS) behind it, so it would be bad if the plaster already looks like this now. You can imagine how it will look behind it soon.
What is an ETICS?
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Pitiglianio16 Oct 2022 10:36Eyedentity schrieb:
Our house was built in 2020 with Poroton (42.5cm (17 inches) blocks, no external thermal insulation composite system)xMisterDx schrieb:
There is an external thermal insulation composite system involved, so it would be bad if the plaster already looks like that nowThe original poster clearly stated that it was built without an external thermal insulation composite system. ateliersiegel schrieb:
What is an external thermal insulation composite system?It is an external thermal insulation composite system (ETICS).ateliersiegel schrieb:
What is a WDVS?
(thirty characters and five words) External Thermal Insulation Composite System (ETICS)… usually the gray polystyrene panels. But…
Eyedentity schrieb:
Our house was built in 2020 with Poroton (42.5cm (17 inches) blocks, no ETICS) and plastered. xMisterDx schrieb:
There is an ETICS on top of that, Edit @Pitiglianio overlapped 😉
I often get annoyed by the many abbreviations used in forums, which I usually can't look up or figure out through an internet search (this time I think I didn’t even try :oops 🙂, and where it’s always assumed that everyone knows what is meant 🙁 (if only there was an explanation displayed on mouseover, like with emojis :rolleyes 🙂
Thanks for the explanation 🙂
Thanks for the explanation 🙂
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