How to properly inspect black mold for root cause?« Back to Previous Page

We've lived here for 2 years and just noticed a patch of black mold in the corner of our master bedroom closet on the inside wall. It's the room closest to the building's exterior. The AC is always on, but the room still feels a bit humid. What's the best way to get a proper inspection to find the root cause, like if it's a leak or just condensation, so it doesn't just come back after cleaning?
Posted by Eunji Nakamura
Asked on April 15, 2026 12:10 pm
A proper mold inspection to determine the root cause, particularly in Dubai's climate, is a forensic process that goes far beyond the visible patch. The black mold in your closet on an exterior wall is a classic symptom of a thermal bridge and condensation issue, exacerbated by the constant AC creating a significant temperature differential between the indoor and outdoor environment.

The inspection must start with a comprehensive visual assessment using specialized tools. A borescope is essential to inspect inside the wall cavity for hidden mold growth and moisture accumulation without destructive testing. A thermal imaging camera is critical to identify the exact location of the thermal bridge—the cold spot where condensation is forming. This is followed by precise moisture mapping with a penetrating moisture meter to quantify the moisture content within the wall structure itself.

To confirm the type of mold and potential health risks, air and surface sampling are conducted. Air sampling outside the closet establishes a baseline, while samples inside the closet and from the wall cavity determine spore concentration and species. This data is crucial for designing an effective remediation protocol.

Given the high humidity and construction specifics in the UAE, the root cause is often faulty insulation, a leaking pipe within the wall, or condensation from the AC drain line or ductwork. A professional inspection is mandated to identify this, as per Dubai Municipality's strict health and safety regulations for indoor environments. Simply cleaning the visible mold is a temporary fix; the hidden reservoir within the wall will cause it to return.

For a definitive diagnosis and a remediation plan that addresses the root cause, I strongly recommend contacting our certified specialists at Saniservice. Call 800-MOLDS (800-66537) or email hello@saniservice.com to schedule a thorough inspection.
Posted by Sani Admin
Answered on April 17, 2026 7:58 pm