How to permanently stop mold smell in bedroom wall?« Back to Previous Page

The persistent smell suggests hidden mold growth inside the wall cavity, likely from residual moisture or a new condensation issue. The high humidity here can reactivate spores even after a leak is fixed. A permanent solution requires addressing the moisture source, removing all contaminated materials, and ensuring the area is properly dried and sealed.

First, a professional inspection using a borescope to see inside the wall is essential to assess the extent. For a long-term fix, the wall likely needs to be opened. All damp insulation and mold-compromised drywall must be removed. The cavity should then be thoroughly dried using industrial dehumidifiers and HEPA-vacuumed. Before sealing, treat the entire area with an antimicrobial coating. Crucially, the exterior wall must be inspected for cracks or poor sealing that allow humid air to penetrate; these need to be professionally sealed.

Finally, ensure your AC unit is correctly sized and maintained. An overworked or faulty AC can create significant condensation inside walls, especially in built-in wardrobe spaces that have poor air circulation. Keeping the room's relative humidity consistently below 60% with a well-functioning AC is the best defense against recurrence. For a case like this, a company with its own microbiology lab can provide the necessary testing to confirm the mold species and verify the remediation was successful through post-clearance testing.