How to treat black mold on wall in humid climate?« Back to Previous Page

That pattern of black spots on an interior wall, paired with a damp feeling, points to a condensation issue exacerbated by our climate. The wall behind the wardrobe is likely a "cold bridge," where the inside surface is cooler than the room's dew point, causing moisture from the humid air to constantly condense and feed mold growth.

For a small, surface-level patch (less than one square meter), you can clean it yourself. Wear an N95 mask, gloves, and eye protection. Use a mixture of detergent and water, or a solution of white vinegar. Scrub the area thoroughly, allow it to dry completely, and then consider applying a mold-inhibiting primer before repainting. Crucially, you must address the moisture source. Move the wardrobe a few inches away from the wall to improve air circulation. Ensure your AC is set to a consistently cool temperature to reduce indoor humidity, and check that it's draining properly.

However, given the description of it "spreading" and the persistent dampness, this likely requires professional assessment. The mold may have penetrated the wall board or plaster, especially if the dampness is due to a hidden pipe leak or rising damp from the foundation, which is not uncommon in older villas. A professional inspection can identify the exact moisture source and the extent of the contamination. They use moisture meters and thermal imaging to find hidden problems you can't see. For a definitive identification of the mold type, a sample can be sent to an accredited microbiology lab for analysis. In many cases, the affected drywall must be safely removed and replaced to fully resolve a recurring issue of this nature.