Bathroom Exhaust Fan Through Roof

Most roof caps for bath fan exhausts have a light aluminum backdraft damper which rests on a sealant strip which is basically a foam piece of weatherstripping.

Bathroom exhaust fan through roof. Table of contents hide. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. This sealant strip is installed to keep cold air from coming in and according to a broan customer service rep it also helps to prevent unbearable metal on metal chatter. To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom.

And of course a bathroom with a window doesn t require an exhaust vent. 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. 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. Bathroom exhaust venting does not have to exit up through the roof and in fact that s not necessarily even the best termination.

This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. Then drill a hole on the roof top. Start in the attic and drill a hole through the roof in the desired vent location. Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it.

Try to keep it close to the fan location.