Bathroom Vented Into Attic

It may also violate a shingle warranty.

Bathroom vented into attic.

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. Each fan vents separately out the roof. It is because of this that many builders tend to advise against this method. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.

In order to accomplish this the roof has to have a hole cut in it. This involves running ductwork from the fan usually though an attic and out through the roof. 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. Mold growth wood rot and structural deterioration moist bathroom air is sucked back into the home interior excess moisture attracting rodents and pests.

While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. This section notes that air exhausted from the bathroom must be sent outdoors not indoors to the same residence or indoors to any other dwelling unit. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. However there are a few real potential downsides when a bathroom vent is improperly terminated inside an attic.

One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building. 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. Exhausting of the bath vent fan must indeed be to the building exterior.

There are several other factors to consider for proper ventilation such as. The bath should be vented by either a 20 cfm continuous vent fan or a 50 cfm vent fan that is intermittent or switched. 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. 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.