How to find the source of recurring black mold?« Back to Previous Page

Recurring black mold after cleaning points to an ongoing moisture source, which is common in Dubai's climate. The most likely culprits are a hidden plumbing leak, condensation from an AC supply line running inside that wall, or water ingress from the outside due to a crack in the building envelope or failed waterproofing.

Start by checking for obvious issues. Ensure your AC is set to a temperature that minimizes condensation, typically between 22-24°C. Feel the wall around and above the mold patch for dampness or a temperature difference. Inspect the exterior wall outside that closet for cracks or damaged sealant, as driving rain can penetrate small openings.

Since the mold returned after surface cleaning, the moisture source is likely hidden. Professional inspection is necessary here. A certified mold inspector will use tools you can't access, like a borescope to see inside the wall cavity and a moisture meter to quantify dampness levels in building materials. They can also perform an air quality test to determine if spores have spread to other parts of the room. Identifying the exact source—whether it's condensation, a leak, or intrusion—is critical because each requires a different remediation strategy. Simply cleaning it again without fixing the root cause will not solve the problem.