ᐅ Water Stain on Wall: Suspected Thermal Bridge. How to Proceed?

Good day.
During an inspection in spring, when it was very cold outside and the interior was heated, I noticed a kind of water stain on the wall next to the balcony door.
Above this is a roof terrace.
Now, I (and others) suspect that there is a thermal bridge here.
I reported this to the builder verbally, and their only response was “there is nothing there.”
Now that the weather is warm, the stain has naturally disappeared.
I expect it will probably reappear next winter.

I would like to note this reservation in the handover protocol.
What are your thoughts on this?
An expert can only come to the site at handover.
However, they probably won’t see anything since everything is now covered up.
It can only be measured when it is cold outside and well heated inside, which means in winter.

Thank you very much for your help.
erika

It is more likely to be a leak in the roof terrace. With a thermal bridge, condensation would only occur when the space is occupied and/or in conditions of high humidity. This would be likely, for example, if screed or plaster was applied before the stains appeared. A thermal bridge can be identified based on the detailed structural component design. The builder should provide this information in detail.

wpic schrieb:
It is more likely to be a leak in the roof terrace. With a thermal bridge, condensation would only form when the space is occupied and/or when there is high humidity. This would probably be the case if screed or plaster had been applied before the stains appeared. A thermal bridge can be identified based on the structural build-up of the component. The building technician should then provide a detailed explanation.

Hello.
At that time (spring), the apartment had high humidity.
Heating was already on, and the plaster had only recently been applied.
Therefore, it was warm and humid inside, and cold outside.
The roof terrace was already completed at that time.
That is why the suspicion of a thermal bridge arose.
That is also why I want to have this recorded in the acceptance report.
But I fear that the building technician will try to hinder me here.

expert ............

wpic schrieb:
It is more likely to be a leak in the roof terrace. A thermal bridge would only cause condensation during occupancy and/or when humidity levels are high. This would, for example, probably occur if screed or plaster had been applied before the stains appeared. A thermal bridge can be identified based on the structural build-up of the component. The builder should present this in detail.

This is not entirely correct. The structural build-up only shows what was planned. What was actually executed is a completely different matter. If everything were carried out exactly as planned, fewer experts would be needed.

Thermal bridges can indeed only be reliably detected during the colder months. Then, as an expert, it is possible to determine whether there is a defect by measuring surface temperatures.

Hello Erika,

I will delete one of your threads – please tell me which one, otherwise I will decide. "Many" doesn’t really mean much anyway!

Regards, Bauexperte