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Moldy corners are a significant indicator of insufficient drainage at a property. When drainage is inadequate, moisture tends to accumulate in specific areas, leading to dampness and an environment conducive to mold growth. Mold thrives in humid and damp conditions, particularly in corners where airflow may be reduced and moisture collects more easily. This can suggest underlying water issues, such as poor grading, blocked gutters, or inadequate downspouts, which prevent water from being effectively diverted away from the building's foundation.

Damp insulation, dry rot, and cracked tiles may also suggest moisture issues but do not specifically point to drainage problems as effectively as the presence of mold in corners. Mold growth is a clear sign of persistent moisture, which is directly related to drainage issues.