ᐅ Interior plaster; cracks visible depending on weather conditions

Hello dear forum,

As a non-professional in construction, I have a question for the experts here.

We bought a house and have not made any changes to the structure. The previous owner carried out a major renovation and installed new windows. On the west side, inside the house, small cracks were visible in the plaster in only one room. Otherwise, there were no or hardly any cracks in the plaster throughout the entire house.

We had a painter come in, who repaired the cracks in the interior plaster on the west side of the house during the renovation. They were not visible afterward. One day, during a period of strong sunlight, the cracks appeared again. I contacted the painter, who said he had repaired everything and nothing was visible at the time. During the final inspection, that was indeed the case. The next day, I wanted to examine and check the cracks, but they had completely disappeared again. Currently, as of September 20, the cracks were as shown in the pictures. This morning before work, they were hardly visible again.

Should the painter come and address the issue again? Could the problem be caused by something else, or is there such a thing as weather conditions affecting the interior plaster?

These appear to be stress cracks, which—as you have already noted—depend on temperature. Materials expand at different rates.

A common solution is to apply a mesh to the wall, onto which the plaster and paint are applied.

It seems to be Q2 or Q3 plaster, which tends to be prone to cracking. You can fill it with joint compound, yes. And sometimes those fine cracks reappear. When sunlight or an overcast sky shines on the wall, you may or may not see them.