Bathroom exhaust fan venting into attic. This is what the International Residential Code 2006 says specifically about bathroom vents. If you need to add ductwork to your home to make the exhaust fans work then youre going to feel a serious punch to your wallet. The air removed by every mechanical exhaust system shall be discharged to the outdoors. Make sure you attach wires of the same color together. If you are looking to install a new bathroom exhaust fan then you need to make sure that it exhausts outside of the residence as there are several legitimate and serious reasons why venting into the attic is a bad idea including the 10 we list here. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. 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.
Mine vents out of a attic vent that is made for Bathroom exhaust units. If you exhaust your bathroom fan into the attic then it will cause condensation due to warm air. It seems like such an easy solution just leave a bathroom vent hose in an attic. If condensation occurs mold and mildew are likely to follow. No you cannot vent your bathroom exhaust fan into the attic. Some homeowners are stubborn though. Bathroom exhaust fan have to vent to attic air ventilation bathroom exhaust vent installation exhaust vents terminate at your soffits attic ventilation specias chicago.
To be properly terminated bathroom fans should exit the home through stem vents that are specifically used for this purpose.
It may also violate a shingle warranty.
The excessive moisture will cause condensation on the roof members insulation and eventually cause mold. If a building inspector were to find out that you vented your bathroom fan into the attic you would receive a notice of violation. Because what happens is when the insulation gets moist from all that moisture thats being dumped into the attic it completely cuts down on the R-value of the insulation. Note that a quick call or visit to your local building department will usually answer any questions you have about your home and the local codes regarding bathroom venting requirements.
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.
March 4 2020.
No you shouldnt vent a bathroom exhaust into the attic as it is against the building code.
