How to treat and stop black mold on humid wall?« Back to Previous Page

The black spots are almost certainly mold, and Dubai's coastal humidity is a primary cause. That sea-facing wall is likely cooler than the indoor air, causing condensation to form behind the wallpaper when the AC is running, creating a perfect damp environment for mold growth.

For a small, visible patch, you can clean it yourself with a solution of white vinegar or a dedicated mold remover. Wear gloves and a mask. However, this only addresses the surface; the mold's root structure (hyphae) is likely penetrating the wallpaper and possibly the wallboard behind it. Simply wiping it will not stop it from returning.

The most effective long-term solution requires addressing the moisture source. The goal is to reduce the temperature differential causing condensation. Ensure your AC is set to a consistent, reasonable temperature (around 22-24°C is common) to minimize extreme cooling. Improve air circulation in the room by using a ceiling fan or repositioning furniture so air can flow freely against that wall. A dehumidifier can also help significantly, especially during the more humid winter months.

For a problem that has been developing for two years, a professional inspection is highly recommended. The mold behind the wallpaper could be more extensive than what is visible. A proper assessment includes moisture metering to find the dampness source and air or swab sampling to identify the mold type, which dictates the correct remediation protocol. In many cases, the wallpaper and potentially compromised drywall must be removed to properly treat the area and prevent regrowth before redecorating with mold-resistant paint and materials.