Bathroom Exhaust Fan Roof Vent Leaking. In winter when the warm moist air from the bathroom hits cool air in the attic or outdoors it condenses sending drips back down the ductwork. I have checked the bathroom fan seal as well and it is not condensation because it is only during heavy rains. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. In winter when the warm moist air from the bathroom hits cool air in the attic or outdoors it condenses sending drips back down the ductwork.
It seems like it may be coming in through the vent when the rain wind blows sideways during a heavy rain fall.
I recommend replacing the vent pipe with insulated vent pipe. In winter when the warm moist air from the bathroom hits cool air in the attic or outdoors it condenses sending drips back down the ductwork. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Many people notice the issue when the bathroom exhaust fan starts dripping on their head as they step out after a shower.
