Which of the following is a sign of moisture issues in a structure?

Mold and mildew stains are a key indicator of moisture issues within a structure. These stains typically occur in areas where there is consistent humidity or water intrusion, creating an environment conducive to mold growth. This not only points to existing moisture problems but also emphasizes the need for immediate attention, as prolonged exposure to such conditions can lead to significant structural damage and health risks for occupants. Detecting mold and mildew is vital for home inspectors, as addressing these issues early can prevent costly remediation and further deterioration of the property.