Black mold on outside wall: DIY or call professional??« Back to Previous Page

The black spots on your wardrobe's exterior wall are a classic sign of condensation-related mould, extremely common here due to Dubai's high humidity levels. The constant fogging on your windows confirms high indoor moisture is condensing on that cooler external wall, creating the perfect environment for mould.

Vinegar often fails because it only addresses the surface and doesn't resolve the underlying moisture problem. For a small area (less than one square meter), a stronger DIY approach using a diluted bleach solution (1 part bleach to 10 parts water) or a dedicated mould remover can be attempted. You must wear gloves, a mask, and ensure good ventilation during cleaning.

However, if it returns after a thorough cleaning—which it already has—this indicates a persistent moisture issue within the wall cavity itself. This is beyond a surface problem and requires professional assessment. In the UAE, this often stems from inadequate insulation in external walls or a slight leak in the building's external waterproofing (IFA), allowing humid air to penetrate and condense.

A professional inspection is advised to identify the precise moisture source. They use moisture meters and thermal imaging to see inside the wall structure. Simply cleaning it repeatedly without fixing the root cause is ineffective and can allow the colony to grow unseen. Remediation often involves addressing the building envelope issue, not just the visible mould. For health reasons, especially in a bedroom, identifying the species through lab testing can also be prudent to confirm it is a common allergen and not a more problematic type.