How to prevent bathroom shower moisture from reaching closet?« Back to Previous Page

The moisture is likely traveling through the air or seeping through the wall cavity. In Dubai's climate, this persistent humidity is a primary driver for mold, as AC systems can't always manage localized steam from showers. First, verify your exhaust fan's actual performance; many are installed without adequate ducting to the outside or lack sufficient power. Hold a single-ply toilet paper to the vent while it's on—it should be held firmly in place. If not, upgrading to a higher CFM (cubic feet per minute) fan is necessary.

Next, create a negative air pressure zone in the bathroom. Keep the bathroom door closed and the fan running for at least 30 minutes after showering. Ensure there's a 1-2 cm gap under the bathroom door to allow makeup air to enter; if the door is sealed tight, the fan can't effectively pull the moist air out. For the closet itself, inspect the shared wall for any cracks or openings around baseboards and seal them with caulk. Consider applying a mold-resistant primer to that wall before repainting as a preventive barrier.

After cleaning the existing mold with a solution like diluted white vinegar, a small, rechargeable desiccant dehumidifier placed inside the closed closet can help maintain lower humidity levels, especially since your main unit is struggling with the spike. For persistent issues, a professional inspection can identify hidden condensation within the wall or inadequate insulation, which is a common issue here.