This can be the nails the sheathing the rafters and more.
Bathroom vent leaking moisture into attic.
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.
Water stains on the ceiling around your bath fan may indicate a leak coming from the vent cap on your roof but condensation is the more likely culprit.
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.
When cold air mixes with humid air that s when the condensation and moisture occurs.
This can also happen during the warmer months.
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.
The duct boot needs to be properly sealed so cold air won t escape.
The usual cause is condensation inside the duct.
Mastic sealant can help solve this problem but speak with a professional first.
If your bathroom fan exhausts into your attic and not outside of your home you could start having serious issues with moisture and mold.
8 common causes of water dripping from ac vent while there are many things that can cause water to drip from your ac vent this isn t a normal occurrence and should be looked at sooner rather than later.
This meetup leads to condensation and will drip water back to your bathroom.
The hot and humid summer air will condense when it hits the pipe made cold by the air conditioning system.
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 cause of condensation.
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.
Leaking and damaged vents as well as improperly installed ones also can cause problems.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
In summer humid outside air condensed on a pipe cooled with air conditioning will drip when humid bathroom air adds to the moisture level.
The warm and moist air from your bathroom goes up and meets the cold air from the attic or outside your home.
Obviously condensation dripping from the nails and sheathing is not a good thing.
Moist indoor air condenses inside a cold uninsulated duct and water runs down into the fan.
If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct.
On a cold day the moisture in the air will condense on anything below the dew point.
The fan pulls warm moist air from the bathroom and distributes the air to the attic.
