How to permanently fix closet mold on exterior wall?« Back to Previous Page

Recurring mold on an exterior wall closet, especially after recent heavy rains, points to a persistent moisture source that surface cleaning won't fix. The issue is almost certainly inside the wall cavity itself.

In Dubai's climate, this is commonly caused by a breach in the building's weatherproofing or thermal envelope. The exterior wall is likely experiencing thermal bridging, where the intense outdoor heat meets the cooled interior air from your AC, creating condensation within the wall. The January rains may have also compromised the external waterproofing, allowing moisture to seep in and become trapped. This hidden dampness then wicks through to the internal wall surface, feeding the mold growth on your belongings.

A permanent fix requires a diagnostic approach. First, a professional inspection with a thermal imaging camera can identify the exact location of the cold spot and moisture accumulation within the wall. They should also check the exterior for cracks in the render or failed sealant around windows.

The remediation involves addressing the root cause: repairing the external waterproofing, potentially injecting insulation to combat condensation, and then treating the affected interior wall. Simply repainting or re-plastering without fixing the moisture source will result in the mold returning, as you've experienced.

For your items, leather is particularly susceptible. Wipe them down with a dilute vinegar solution and ensure they are completely dry before storing them again, but only after the wall issue is resolved. Until the wall is fixed, consider moving valuables to an interior closet to prevent further damage.

Given this is a structural moisture issue, a professional assessment is strongly recommended to break the cycle. Look for a provider that offers diagnostic testing and can explain the specific remediation plan for your building's construction.