Bathroom Exhaust Fan Goes Into Attic

Mold can spread rapidly in an attic.

Bathroom exhaust fan goes into attic.

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. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. It s all outdoor air anyways right. This involves running ductwork from the fan usually though an attic and out through the roof.

No you cannot vent your bathroom exhaust fan into the attic. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one. No you should not vent a bathroom fan directly into an attic. Mold is commonly found in attics with bath fans that exhaust moist air into the attic.

It cannot move air to a crawlspace or attic. Bath fans should always exhaust outside through the roof via insulated duct and terminate on a dampered roof cap. No it s never a good idea to have any exhaust fan in your home dump all that hot moist air in your attic. Proper bath fan exhaust.

For optimum performance locate it between the shower and the toilet. 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. Climb into the attic and clear away any insulation from around the hole. It may also violate a shingle warranty.

It is because of this that many builders tend to advise against this method. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. 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.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. 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. 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.

Draw a mark on the bathroom ceiling where you d like to install the vent fan. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations.