How to treat black mold in humid apartment corner?« Back to Previous Page

Black spots at the ceiling-wall junction in a humid Marina apartment are a classic sign of condensation mould, often from the temperature differential between the cold AC duct above and the warm, humid room air. The high humidity we've been experiencing accelerates this growth.

For a small area (under one square meter), you can address it yourself. Wear an N95 mask and gloves. Scrub the area with a mixture of detergent and water, then follow with a disinfectant like diluted white vinegar or a 3% hydrogen peroxide solution. Dry the area completely with a fan. The critical step is addressing the moisture source. Wipe down condensation from AC vents daily and consider using a desiccant dehumidifier in the room to lower humidity levels below 60%, which inhibits mould growth.

If the mould returns quickly after cleaning, covers a larger area, or you notice a persistent musty smell, the issue is likely systemic and behind the wall. In this case, a professional inspection is necessary to identify the full extent. They can use moisture meters and borescopes to check for insulation issues or leaks within the ceiling void.

Regarding your landlord, under Dubai rental law (Law No. 26 of 2007), the property owner is typically responsible for structural repairs and addressing issues that affect habitability, which includes persistent damp and mould originating from building defects. A professional inspection report from a company with its own microbiology lab can provide the documented evidence needed to formally request remediation from your landlord, proving it's not just a surface cleaning issue.