Roof Venting A Bathroom Fan

A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

Roof venting a bathroom fan.

If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. We explain how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have.

The truth about attic bathroom venting. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Bathroom exhaust fans perform an important function by removing excess moisture from your home. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is. Options for venting a bathroom exhaust fan include best to worst. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. From inside the attic drive a nail through the roof directly above the bathroom vent fan.

Center the nail between two rafters. 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. Slide a flat pry bar underneath the shingles around the nail to break the weather seal. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside. I would by lying if i told you that it will cause problems it may be totally fine. Bathrooms must have windows when this section is adopted by a community it essentially says that for venting purposes bathrooms must have windows that open.

From the roof find the nail and use the utility knife to cut roof shingles from around the nail. Bathroom exhaust fan venting code summary section r303 3.