Bathroom Exhaust Fan Goes Into Attic

For optimum performance locate it between the shower and the toilet.

Bathroom exhaust fan goes into attic.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. No it s never a good idea to have any exhaust fan in your home dump all that hot moist air in your attic. 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. No you should not vent a bathroom fan directly into an attic.

It cannot move air to a crawlspace or attic. It is because of this that many builders tend to advise against this method. It seems like such an easy solution just leave a bathroom vent hose in an attic. This involves running ductwork from the fan usually though an attic and out through the roof.

Climb into the attic and clear away any insulation from around the hole. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. No you cannot vent your bathroom exhaust fan into the attic. It s all outdoor air anyways right.

Draw a mark on the bathroom ceiling where you d like to install the vent fan. It can cause you a lot of problems with mold and mildew forming on the underside of your rafters and decking as well as getting into your insulation. 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. In order to accomplish this the roof has to have a hole cut in it.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. You should never exhaust the bathroom fan directly into the attic. Mold can spread rapidly in an attic. Several different ways you can move that hot air to the outside.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Bath fans should always exhaust outside through the roof via insulated duct and terminate on a dampered roof cap. It may also violate a shingle warranty. One attic mounted fan for two bathrooms one in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

Click here to learn more about attic mold. Mold is commonly found in attics with bath fans that exhaust moist air into the attic.