Mould on a wall is first a question of dampness and affected material. Applying a biocide fixes neither a leaking pipe nor a thermal bridge. Simply correcting discolouration is not reliable remediation.
Investigate the cause systematically
| Observation | Next question |
|---|---|
| Recurring patch | Where does the moisture come from? |
| Water damage | Which building components are affected and need drying? |
| Hidden or extensive growth | What expert investigation and remediation are needed? |
| Affected porous material | Is cleaning enough, or must material be professionally removed? |
Biocides are not a general substitute for remediation
Germany's Federal Environment Agency prioritises resolving the cause and proper removal. Large-scale disinfection during or after ordinary remediation is not the standard approach. A justified special measure in an individual case belongs in expert planning.
No improvised CDL use in living spaces
Do not spray, nebulise, acidify or mix chlorine dioxide solutions with cleaners on your own. Whether a technical product may be used for a particular purpose must be checked for that product. Biocide notification is not general permission to treat living spaces.
When expert help is useful
Do not cover extensive, recurring or unexplained growth with ever more products. People with relevant respiratory conditions or a weakened immune system should not carry out remediation themselves. After chemical exposure, seek immediate medical help for breathing difficulty or severe symptoms and leave the area if it is safe to do so.
Frequently asked questions
Can mould return if dampness is not resolved?
It can. The cause must be identified and resolved permanently.
Is a killed fungus automatically removed?
No. Affected material and remaining components need separate assessment.
