Blackish-green spots spreading on wall—DIY or call professional?« Back to Previous Page

That spreading pattern suggests active mold growth, likely due to a hidden moisture source. In Dubai's high humidity, this is common on exterior walls or areas with poor airflow, like behind furniture.

For a small area (under one square meter), you can attempt a DIY approach. Wear an N95 mask, gloves, and safety glasses. Move the sofa away for full access. Clean the area with a solution of detergent and water, then wipe with a diluted bleach solution (one part bleach to four parts water). Dry the wall completely with a fan. However, this only addresses surface mold, not the root cause.

Given the description—spreading, blackish-green coloration, and location on a villa wall—the moisture source could be significant. It might be condensation from AC ducts inside the wall, a slow pipe leak, or moisture wicking from the ground. DIY cleaning will likely be temporary without identifying and rectifying the source.

A professional inspection is recommended. They will use moisture meters and thermal imaging to locate the source of the dampness, which is critical for a permanent solution. In many cases, the wall may need to be opened to address internal condensation or leaks and ensure the structure is properly dried. For remediation, look for providers who follow IICRC standards and can provide before-and-after testing from an accredited lab to verify the space is truly mold-free.