How to permanently remove recurring black mold in bedroom?« Back to Previous Page

We've lived here for 2 years and just noticed a patch of black mold in the corner of our master bedroom closet, which shares a wall with the ensuite bathroom. My youngest son has had a persistent runny nose and a cough for the last month that just won't clear up, and I'm starting to panic that it's connected. I wiped the area with bleach, but it came back darker a week later. What is the most effective way to get rid of it for good and who should I call to check if it's spread inside the walls?
Posted by Dong Wang
Asked on April 13, 2026 3:40 pm
Bleach only removes surface discoloration, not the root structure, which is why it returned. The likely source is moisture from your bathroom migrating through the wall. In Dubai's climate, constant AC use creates significant condensation, and trapped moisture behind walls is a common cause of recurring mold.

For a permanent fix, you must identify and eliminate the moisture source. A professional inspection is recommended, as the mold inside the wall cavity is likely more extensive than the visible patch. They use moisture meters and borescopes to assess the wall's interior without unnecessary demolition. Remediation involves isolating the area, removing contaminated materials like drywall or insulation, and using specialized antimicrobial treatments on the framing.

Given your son's persistent respiratory symptoms, a lab test to identify the mold species is advisable to understand potential health implications. Look for a provider with a certified microbiologist or in-house lab, like Saniservice, who can provide documented evidence of clearance post-remediation.

To prevent recurrence, ensure the bathroom ventilation fan is working correctly and runs during and for 20 minutes after showers. Check for any leaking pipes in the vanity or shower. Using a dehumidifier in the bedroom can also help maintain humidity levels below 60%, making the environment less hospitable for mold growth.
Posted by Sani Admin
Answered on April 15, 2026 11:05 am