Bathroom Fan Vent Exhausts Into Attic

Surprisingly bathroom fans are not required by some building codes.

Bathroom fan vent exhausts into attic.

It is because of this that many builders tend to advise against this method. It s all outdoor air anyways right. 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.

This involves running ductwork from the fan usually though an attic and out through the roof. Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside. Two bathrooms one roof vent both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. 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.

No you cannot vent your bathroom exhaust fan into the attic. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. No you should not vent a bathroom fan directly into an attic. Vent your bath and kitchen exhaust fans through the roof through a special roof hood.

It seems like such an easy solution just leave a bathroom vent hose in an attic. In order to accomplish this the roof has to have a hole cut in it. You should never exhaust the bathroom fan directly into the attic. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.