Why Bathroom Ventilation Problems Lead to Ceiling Mold and How to Fix It

https://thecleancorner.hexaforgey.com/posts/why-bathroom-ventilation-problems-lead-to-ceiling-mold-and-how-to-fix-it

When your bathroom's exhaust fan fails to remove enough moisture, steam condenses on the ceiling, creating a damp haven for mold spores. Poor ventilation lets humidity linger after showers, allowing black or green patches to form. Fix it by upgrading to a properly-sized fan that vents outside, often with a humidity sensor. Regularly cleaning the fan and checking for blocked ducts also helps keep moisture in check.