The fan pulls warm moist air from the bathroom and distributes the air to the attic.
Bathroom vent leaking moisture into attic.
This can also happen during the warmer months.
You should never have a bathroom vent terminate in your attic it must exit your roof directly and ideally be far away from soffits and roof overhangs which could retain the moisture and divert it.
The most common sign of your ac leaking water is water stains or yellowing on your ceiling near the air vents not a good look.
On a cold day the moisture in the air will condense on anything below the dew point.
Leaking and damaged vents as well as improperly installed ones also can cause problems.
The warm and moist air from your bathroom goes up and meets the cold air from the attic or outside your home.
If your bathroom fan exhausts into your attic and not outside of your home you could start having serious issues with moisture and mold.
Moist indoor air condenses inside a cold uninsulated duct and water runs down into the fan.
In summer humid outside air condensed on a pipe cooled with air conditioning will drip when humid bathroom air adds to the moisture level.
Condensation from moisture laden air can cause health and structural problems as well especially when the bathroom vents discharge moist air into attics or crawl spaces.
When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form.
If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
The cause of condensation.
Mastic sealant can help solve this problem but speak with a professional first.
The usual cause is condensation inside the duct.
When cold air mixes with humid air that s when the condensation and moisture occurs.
Obviously condensation dripping from the nails and sheathing is not a good thing.
The water could be coming from an air leak in the vent or something called the duct boot.
The duct boot needs to be properly sealed so cold air won t escape.
No you cannot vent the bathroom exhaust fan into the soffit vents.
This meetup leads to condensation and will drip water back to your bathroom.
This can be the nails the sheathing the rafters and more.
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 hot and humid summer air will condense when it hits the pipe made cold by the air conditioning system.
