Bathroom Venting In Attic

So you will need to check with your city or county planning and permitting department to find out code requirements regarding bathroom fans.

Bathroom venting in attic.

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. Mold in a bathroom can be caused by a plumbing leak but splotchy stains on wall or ceiling surfaces usually indicate inadequate ventilation too much moisture in bathroom air. Example model ventilation codes. Because what happens is when the insulation gets moist from all that moisture that s being dumped into the attic it completely cuts down on the r value of the insulation.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. Exhausting of the bath vent fan must indeed be to the building exterior. This can also cause mold to form on wood or insulation in an attic space above a bathroom. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. What is the bathroom exhaust fan venting code.

Through the roof or an exterior gable wall. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. An enclosed toilet would require its own exhaust fan exhaust fans approved for installation in wet areas would need to be located over or near the shower or tub bathroom doors should have at clearance to the floor.

Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. So you do need to get that vented outside whether it s through the siding with one of those trap doors that sort of opens out every time you ve got it on or through the soffit. You can find 4 in. Building code is a model code that each community can adopt and adapt according to its own needs.

Either way the vent will have to go directly to the outside and installed with a vent hood cover. There are several other factors to consider for proper ventilation such as. The correct way to vent a bathroom fan through an attic is to terminate the vent either to the roof or to the gable wall. Each bathroom has its own exhaust fan.