Bathroom Fan Venting In Attic

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.

Bathroom fan venting in attic.

Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. It seems like such an easy solution just leave a bathroom vent hose in an attic. No you should not vent a bathroom fan directly into an attic. Exhausting of the bath vent fan must indeed be to the building exterior.

Improperly ending a bathroom vent inside an attic can lead to unintended consequences and builders have stopped this bad practice many years ago. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. 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. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

If your attic is enclosed california s building code states it should have cross ventilation. Options for venting a bathroom exhaust fan include best to worst. The building code requires a bathroom exhaust fan to vent outside the building so installation of a new bathroom fan necessarily involves installation of ductwork. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. In order to accomplish this the roof has to have a hole cut in it. Venting fans pull moisture laden air out of that small space slowing or altogether preventing it from condensing on walls on the ceiling or worst of all in the ceiling. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end.

This is much easier to do if you have attic access because if you don t you usually have to remove some ceiling drywall and run the ducts along a joist. That is openings doors windows and louvers to the outside should create a. Let me tell you. It can be an ugly sight to crawl above a poorly ventilated bathroom s ceiling.

This involves running ductwork from the fan usually though an attic and out through the roof. Example model ventilation codes. You should never exhaust the bathroom fan directly into the attic. It is because of this that many builders tend to advise against this method.

No you cannot vent your bathroom exhaust fan into the attic. Through the roof or an exterior gable wall.