Black mold under shower sealant: DIY or professional in Dubai?« Back to Previous Page

Black mold under silicone sealant is very common in Dubai bathrooms due to the high humidity and constant condensation from year-round AC use. The mold you see is likely just the surface growth; the main colony thrives in the damp cavity behind the tiles and grout.

For a small, surface-level patch, a DIY approach can be a temporary fix. Scrape out the contaminated silicone, treat the area with a dedicated mold remover (not just bleach, as it doesn't kill the root and its fumes are hazardous in enclosed spaces), and apply a new high-quality sealant. However, a persistent musty smell strongly suggests hidden moisture and deeper growth within the wall. In this case, DIY cleaning is ineffective and just masks the problem.

Professional remediation is strongly advised when there's a persistent odor or suspected hidden growth. The cost is not fixed; it depends entirely on the extent of the contamination behind the walls, which requires diagnostic tools to assess. Companies will use moisture meters and borescopes to determine the spread before providing a scope of work and cost. The proper process involves containment to prevent spores from spreading, removal of contaminated materials like drywall or insulation, specialized drying, and finally, applying antimicrobial solutions. For a standard shower area, if the damage is contained, the cost is typically moderate, but it increases significantly if the mold has spread into adjacent walls or the ceiling.

Given your description of a long-term musty smell in a JVC apartment, a professional inspection is the most prudent first step to accurately assess the situation and prevent it from recurring.