Is black mold under shower sealant urgent to treat?« Back to Previous Page

Yes, it is urgent to treat. The presence of black mould under silicone sealant indicates a persistent moisture problem, and its discovery alongside your congestion makes addressing it a priority for your indoor health.

In Dubai's climate, bathrooms are high-risk areas due to constant humidity from showers and year-round AC use, which can create condensation. Mould thrives in these damp, enclosed spaces. While many types of black-coloured mould are common and cause allergic reactions like the congestion you describe, some species can produce mycotoxins. The only way to confirm the type and associated risk is through a professional lab analysis of a sample.

For a small, visible patch, a thorough DIY cleaning can be effective. However, because the mould is under the sealant, it is almost certain that the growth is more extensive than what you see on the surface. Simply spraying bleach on the surface is insufficient; it will not reach the root of the growth hidden beneath and may only bleach the visible colour, giving a false sense of security. The contaminated silicone sealant must be completely removed, the underlying area professionally cleaned and dried, and new sealant applied.

Given your symptoms and the concealed nature of the growth, a professional assessment is strongly recommended. They can determine the full extent, properly contain the area during remediation to prevent spores from spreading to other parts of your JBR apartment, and verify with testing that the issue is resolved. The key is not just cleaning what you see, but solving the moisture problem and ensuring the mould is completely removed.