Black mold in bedroom closet: DIY or call maintenance?« Back to Previous Page

First, assess the size and severity. If the patch is smaller than one square meter and confined to the surface, a DIY approach is often feasible. For anything larger, or if you see fuzzy growth or discoloration deep into the drywall, it's time to call a professional.

Given its location on an exterior wall, this is likely condensation-related mold, extremely common here due to the high humidity and constant AC use creating temperature differentials. The wall is likely a cold spot where moisture condenses.

For a small DIY job, wear an N95 mask and gloves. Mix a solution of one part white vinegar to four parts water or a diluted bleach solution (check manufacturer guidelines for the surface). Scrub the area, let it sit for 15 minutes, then wipe dry. The key is to dry the area completely afterward; use a fan or dehumidifier.

However, simply cleaning the surface may not be enough if the moisture source isn't addressed. You must identify why moisture is accumulating there. Improve ventilation in the closet, ensure there's a gap between the wall and your storage boxes, and consider using a moisture-absorbing product like silica gel.

If the mold returns quickly after cleaning, if there's a musty odor, or if you or any family members experience unexplained respiratory issues, stop and get a professional inspection. They can use moisture meters and thermal cameras to find the exact source of the dampness—it could be a minor insulation gap or a more significant issue. They can also take samples for lab analysis to identify the mold species, which determines the appropriate remediation protocol.

For rental properties, you should notify your building maintenance. They are typically responsible for the building envelope, including external walls. They may need to address external sealing or insulation issues that are causing the internal condensation. A professional report from an independent inspector can be useful to provide them with evidence of the underlying cause.