Bathroom Vents Into Attic

Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.

Bathroom vents into attic. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. Climb into the attic and clear away any insulation from around the hole. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. Draw a mark on the bathroom ceiling where you d like to install the vent fan. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it.

In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations.

If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. Options for venting a bathroom exhaust fan include best to worst. For optimum performance locate it between the shower and the toilet.

No you cannot vent the bathroom exhaust fan into the soffit vents. Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood. 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.