Bathroom Exhaust Fan Vented Into Attic

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. Most municipalities require extractor and exhaust fans to be vented to the outside of the building with an vent cap. 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.

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It seems like such an easy solution just leave a bathroom vent hose in an attic.

Bathroom exhaust fan vented into attic.

It s all outdoor air anyways right. Options for venting a bathroom exhaust fan include best to worst. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Through the roof or an exterior gable wall.

This will cause mold and could leave your home unlivable. No you should not vent a bathroom fan directly into an attic. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. You should never exhaust the bathroom fan directly into the 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. Excessive moisture will cause condensation on roof members and insulation. It may also violate a shingle warranty.

Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. No you cannot vent your bathroom exhaust fan into the attic.

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