Bathroom Exhaust Fan Vented Into Attic

It s all outdoor air anyways right.

Bathroom exhaust fan vented into attic.

It seems like such an easy solution just leave a bathroom vent hose in an attic. Excessive moisture will cause condensation on roof members and insulation. No you cannot vent your bathroom exhaust fan into the attic. No you should not vent a bathroom fan directly into an attic.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. It s never okay to vent directly into the attic even if you re attic is vented. It may also violate a shingle warranty. Most municipalities require extractor and exhaust fans to be vented to the outside of the building with an vent cap.

This will cause mold and could leave your home unlivable. 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. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

You should never exhaust the bathroom fan directly into the attic. Dumping bathroom exhaust into an attic or under roof space invites costly mold contamination frost under the roof in freezing climates moisture damage to roof sheathing possibly even plywood delamination or rot roof failures and shorter roof shingle life.