How to permanently stop closet mold on outside wall?« Back to Previous Page

Our bedroom closet on the outside wall has started getting black mold spots, especially after the recent humid weather. We’ve wiped it down with vinegar a couple of times, but it keeps coming back within a few weeks, and I'm worried it's affecting our clothes. What’s the most effective long-term solution to stop this moisture from coming back, and should I talk to my building management about it?
Posted by Raj Mishra
Asked on March 22, 2026 11:21 am
Based on the symptoms you've described, this is a classic case of condensation-driven mold growth, a very common issue in Dubai apartments, especially on exterior walls which are prone to thermal bridging.

The vinegar wipe-down is a temporary fix because it only addresses the surface mold, not the underlying moisture source. The recurring mold indicates a persistent humidity problem within the closet's micro-environment. The moisture is likely condensing on the cooler surface of the outside wall, particularly at night when the AC is off or set higher.

For a permanent solution, you need a multi-pronged approach:

1. Immediate Action & Assessment: First, remove all clothing and contents from the closet. A professional inspection is highly recommended to confirm the mold type (some black molds can be problematic) and use a thermal imaging camera to pinpoint the exact location and severity of the condensation. This is crucial for the long-term fix.

2. Moisture Control: You must improve air circulation. Leave the closet doors ajar regularly. Consider installing a small, battery-operated dehumidifier or a PC fan inside the closet to keep air moving. Ensure your apartment's AC is functioning correctly and set to a consistent humidity level—ideally below 60%.

3. Building Management: Absolutely speak with your building management or owner's association. Under Dubai's rental laws and strata regulations, the structural integrity of the building envelope, including water ingress issues from the outside, is typically their responsibility. They need to inspect the building's external waterproofing and insulation on that wall. There might be a crack or failed sealant allowing humid air to penetrate.

For a problem that keeps returning, DIY methods are not sufficient. The hidden moisture within the wall cavity needs to be addressed. We offer comprehensive moisture mapping and mold inspections to identify the root cause.

For a proper assessment and permanent remediation plan, please call us at 800-MOLDS or email hello@saniservice.com.
Posted by Sani Admin
Answered on March 25, 2026 5:53 am