The answer to 'roof vent water stains' is that they are a common issue caused by various factors, including improper installation, damage, or deterioration of the roof vent. These stains can indicate an underlying problem that needs to be addressed to prevent further damage to your roof and home.
Some common causes of roof vent water stains include cracked or damaged vent seals, loose or missing flashing, and poor ventilation. The stains may appear around the vent, on the roof surface, or even inside the home, depending on the severity of the issue. If left unattended, these stains can lead to water damage, mold growth, and even structural problems.