Bathroom Vent Leaking Moisture Into Attic

No you cannot vent the bathroom exhaust fan into the soffit vents.

Bathroom vent leaking moisture into attic.

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. The cause of condensation. Mastic sealant can help solve this problem but speak with a professional first. 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.

The duct boot needs to be properly sealed so cold air won t escape. The usual cause is condensation inside the duct. Obviously condensation dripping from the nails and sheathing is not a good thing. On a cold day the moisture in the air will condense on anything below the dew point.

When cold air mixes with humid air that s when the condensation and moisture occurs. 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. This can be the nails the sheathing the rafters and more. This can also happen during the warmer months.

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. The water could be coming from an air leak in the vent or something called the duct boot. 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 warm and moist air from your bathroom goes up and meets the cold air from the attic or outside your home. 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. The fan pulls warm moist air from the bathroom and distributes the air to the 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.

The hot and humid summer air will condense when it hits the pipe made cold by the air conditioning system. If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct. 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. 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.

Leaking and damaged vents as well as improperly installed ones also can cause problems.