Bathroom Exhaust Fan Vented Into Attic

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

Bathroom exhaust fan vented into attic. Options for venting a bathroom exhaust fan include best to worst. 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. You should never exhaust the bathroom fan directly into the attic. It seems like such an easy solution just leave a bathroom vent hose in an attic.

Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. This will cause mold and could leave your home unlivable. 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. No you should not vent a bathroom fan directly into an attic. Through the roof or an exterior gable wall. No you cannot vent your bathroom exhaust fan into the attic.

Excessive moisture will cause condensation on roof members and insulation. 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.