Roof Venting A Bathroom Fan

Options for venting a bathroom exhaust fan include best to worst.

Roof venting a bathroom fan.

Center the nail between two rafters. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. From the roof find the nail and use the utility knife to cut roof shingles from around the nail.

I would by lying if i told you that it will cause problems it may be totally fine. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. Bathroom exhaust fans perform an important function by removing excess moisture from your home. 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.

From inside the attic drive a nail through the roof directly above the bathroom vent fan. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly. Bathroom exhaust fan venting code summary section r303 3. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. If you vent through the roof condensation will drip back into the interior. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. 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.

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. 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. 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. This involves running ductwork from the fan usually though an attic and out through the roof.

Slide a flat pry bar underneath the shingles around the nail to break the weather seal. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.