What's causing black spots on my window frames?« Back to Previous Page

Those black spots are almost certainly mold growth caused by condensation. In Dubai's climate, your air-conditioned room creates a significant temperature difference between the cold indoor air and the hot, humid outdoor air. This causes moisture to condense on the cooler window frames, creating the perfect damp environment for mold to thrive, especially in the often humid summer months.

A proper inspection should first identify the moisture source. In your case, the condensation is the primary culprit, but an inspector will also check for any hidden leaks in the wall or window sealant that could be worsening the problem. They will assess the extent of the growth, both visible and potentially hidden within the wall cavity. For a thorough diagnosis, surface sampling or air quality testing can be sent to a microbiology lab to identify the specific mold species, which determines the appropriate remediation approach.

To prevent it from spreading, immediately wipe the condensation from your windows and frames daily. Ensure your AC is set to a reasonable temperature—overcooling exacerbates condensation. Run the AC's dry mode if available, as it prioritizes dehumidification. Improve air circulation in the room with a fan, and keep curtains or blinds open during the day to minimize cold pockets.

For a case like yours in JVC, a professional inspection is recommended to rule out hidden issues and get a science-backed plan. Look for a provider that offers a comprehensive assessment with documented findings and, if necessary, lab analysis, rather than just a visual check. This will give you a clear understanding of the cause and the most effective way to resolve it permanently.