Symptoms
Fungal growht can appear with high humidity of the substrate and surroundings.
Cause
- Condense
- Watering in
- Bad ventilation
Solutions
Take measurements that lead to drying of the substrate (and remaining dry of the substrate). Clean old paint layers and apply a fitting top coat. On inorganic substrates a fungicidal wall paint shall be applied, e.g. [Alpha(tex) Schimmelwerend].