To fix basement ceiling mold, first identify and address the source of moisture, such as leaks or high humidity. Clean the affected area with a mold-killing solution and allow it to dry completely. Repaint with mold-resistant paint and consider improving ventilation to prevent future issues.

Identify and fix the moisture source, clean with a mold-killing solution, and repaint with mold-resistant paint. Improving ventilation helps prevent future mold growth. Addressing moisture and cleaning effectively resolves ceiling mold problems.