How should an inspector assess a roof for mold-related issues?

To assess a roof for mold-related issues, inspecting for discoloration, leaks, or attic moisture is essential. This method directly targets indicators of mold growth, which require moisture to thrive. Discoloration on the roof or inside the attic may suggest the presence of mold, especially if it appears black or greenish. Similarly, identifying leaks or moisture buildup in the attic points to a potential source of humidity or water intrusion, which can lead to mold growth if not addressed.

In contrast, checking for signs of damaged shingles is relevant to the roof's overall condition but does not specifically indicate whether mold is present. Reviewing the building's history with water damage provides context but does not directly assess the current state of the roof. Counting the number of vents on the roof does not contribute directly to understanding mold-related issues; while ventilation is important for moisture control, the count alone does not indicate mold risk or existing growth. Thus, the focused effort on visible signs of moisture and discoloration is the most effective strategy for determining potential mold issues on a roof.