Roof Venting A Bathroom Fan

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.

Roof venting a bathroom fan. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. 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.

If you vent through the roof condensation will drip back into the interior. 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. Slide a flat pry bar underneath the shingles around the nail to break the weather seal. Options for venting a bathroom exhaust fan include best to worst.

It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. 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. Bathroom exhaust fan venting code summary section r303 3. This involves running ductwork from the fan usually though an attic and out through the roof.

In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly. The truth about attic bathroom venting. 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. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

Bathroom exhaust fans perform an important function by removing excess moisture from your home. From inside the attic drive a nail through the roof directly above the bathroom vent fan. Center the nail between two rafters. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. From the roof find the nail and use the utility knife to cut roof shingles from around the nail.