Bathroom Vent Fan Venting Into Attic

You should never exhaust the bathroom fan directly into the attic.

Bathroom vent fan venting into attic.

Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. It is because of this that many builders tend to advise against this method.

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 involves running ductwork from the fan usually though an attic and out through the roof. No you should not vent a bathroom fan directly into an attic. The exhaust vent must terminate outdoors.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans. In order to accomplish this the roof has to have a hole cut in it. Options for venting a bathroom exhaust fan include best to worst.

Surprisingly bathroom fans are not required by some building codes. No you cannot vent your bathroom exhaust fan into the attic. Through the roof or an exterior gable wall. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.