ᐅ The plaster has discolored and is peeling off.

Hello – I have noticed discoloration on the exterior plaster in the entrance area of my building, which is about 6 years old. There is also some damage to the topcoat plaster in that spot.

I understand remote diagnosis is difficult, but I have some questions for the experts:
- Is this due to mechanical stress or possibly moisture damage?
- Does something need to be done immediately, and if so, what would be the appropriate action?

Photos attached.

Thank you for your assessment.

Moisture is rising because there is no waterproofing, and I also don't see any membrane.

Apparently moisture. It is rising from below. However, it seems to have been there for quite some time, doesn’t it?

ypg schrieb:

It appears to be moisture. Rising from below. But it seems to have been there for a while, right?

I first noticed it in the summer – but to be honest, I didn’t think much of it at the time.

Is it just a surface issue, or could it be a deeper problem? What would be the correct way to deal with it? Does it require immediate action?

In fact, I have to say that it looks worse in the pictures than it does in reality.

Seal with a thick coating and install a dimpled membrane.

The recommendation to use a thick coating and dimpled membrane is too general.

It is either a splash water issue or rising damp.
Most likely, it is rising damp. A properly executed waterproofing would, for example, have been extended up over the panels.
If you want to waterproof correctly, the panels need to be removed. Is the damage only in the reveal area? That would be unusual.
The waterproofing must also be applied below the top edge of the soil level; otherwise, it is pointless. The base area should normally be constructed differently in this case. The existing top plaster is probably not suitable for the base either.
So either invest in proper work or accept the situation as it is.