What evidence indicates water infiltration near ventilation openings?

The indication of water infiltration near ventilation openings is particularly evidenced by examining the condition at gable openings. These areas are often designed to allow air exchange, but if there are gaps, improper sealing, or other failures in the ventilation system, they can become points of intrusion for water. Observing water infiltration at gable openings suggests that water is getting through these poorly protected areas, signaling deficiencies that impact both the building's integrity and indoor air quality.

In contrast, while stained roof sheathing, increased indoor humidity, and discoloration of drywall in the attic may point to moisture issues, they do not specifically isolate the cause of water infiltration as clearly as evidence found directly at the gable openings. Stains or high humidity levels can result from a variety of sources, making them less definitive indicators of infiltration specifically from those ventilation openings. Therefore, identifying water infiltration evidence at gable openings more accurately pinpoints where issues may be occurring in relation to ventilation.