Bath Exhaust Fan Through Roof

This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.

Bath exhaust fan through roof. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. See below for a shopping list and tools subscribe.

The master bathroom and the 2nd bathroom vent through the roof and through the same opening. The alternative to a roof exhaust if you re concerned about not being able to seal the hole in the roof is to exhaust through a gable end. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Next use aviation snips to cut slits into the sheet metal sleeve.

Take the end of the duct with the connector fitting and attach it to bath vent fan. Bend over the tabs then nail the tabs to the roof. Pass the opposite end of the duct through the hole in roof. Run a thick bead of tri polymer sealant along the underside of vent hood.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. Going through the roof guarantees it will go up in the air and away from your home i would love to see a copy of the building code that suggests venting a bathroom fan through the soffit is recommended.