Venting A Bathroom Exhaust Fan Into Attic

There appears to be roof vents in the attic but the bathroom exhaust fan isn t piped directly to any of them. 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. About how the exhaust fan is vented out of the bathroom.

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It may also violate a shingle warranty.

Venting a bathroom exhaust fan into attic. It s currently just vented into the attic. It should not vent into the attic space it should exit through a sidewall or the soffit in the attic. You should never exhaust the bathroom fan directly into the attic.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. Building codes prohibit bathroom vent fans from terminating or exhausting into. Bathroom vent fan codes venting into attic mold structural issues bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

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

Note that a quick call or visit. Options for venting a bathroom exhaust fan include best to worst. In order to accomplish this the roof has to have a hole cut in it.

It seems like such an easy solution just leave a bathroom vent hose in an attic. It is because of this that many builders tend to advise against this method. 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.

It s all outdoor air anyways right. Bathroom exhaust fans perform an important function by removing excess moisture from your home. No you cannot vent your bathroom exhaust fan into the attic.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. 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.

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