Bathroom Vent Exhaust Into Attic

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

Bathroom vent exhaust into attic.

You can find 4 in. In order to accomplish this the roof has to have a hole cut in it. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. It is because of this that many builders tend to advise against this method.

Through the roof or an exterior gable wall. Each bathroom has its own exhaust fan. You should never exhaust the bathroom fan directly into the attic. It s all outdoor air anyways right.

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. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Duct already wrapped in insulation at home centers.

It may also violate a shingle warranty. Dumping bathroom exhaust into an attic or under roof space invites costly mold contamination frost under the roof in freezing climates moisture damage to roof sheathing possibly even plywood delamination or rot roof failures and shorter roof shingle life. Each fan vents separately out the roof. 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.

No you should not vent a bathroom fan directly into an attic. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. It seems like such an easy solution just leave a bathroom vent hose in an attic. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. Options for venting a bathroom exhaust fan include best to worst. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. 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.