ᐅ Mold or Mildew on the Screed?

Hello forum,

After the plastering (2 weeks drying time with tilted windows) and without any problems, mold or, according to the site manager, mildew stains appeared very suddenly after the screed was applied. However, I am quite surprised by the large black spots (see photos) and would prefer to consult a mold expert. Does anyone have experience with this? I would rather have the material replaced. Although the spots have decreased after increasing ventilation, in my experience mold can also hide.

Thanks and regards

Ventilated incorrectly. Was it ventilated with the window tilted or according to the instructions?

According to the instructions, from the second day onwards, the rooms should be ventilated briefly but thoroughly at least once a day. We followed this, but before that, the windows had been left on tilt by the contractors. Mold appeared almost overnight.

A different question: Where exactly is the edge insulation strip? Or am I just missing it?

hanse987 schrieb:

A different question. Where exactly is the edging insulation strip? Or am I missing it?

Doesn't the photo show two walls and the ceiling where the stains have appeared?

Sorry, I think I had a visual distortion. I saw a floor with two walls, but you’re probably right about the ceiling.