No it s never a good idea to have any exhaust fan in your home dump all that hot moist air in your attic.
Bathroom exhaust fan blowing into attic.
Your bathroom exhaust fan blows directly into your attic.
Most municipalities require extractor and exhaust fans to be vented to the outside of the building with an vent cap.
Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.
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.
The bath should be vented by either a 20 cfm continuous vent fan or a 50 cfm vent fan that is intermittent or switched.
No you should not vent a bathroom fan directly into an attic.
Because what happens is when the insulation gets moist from all that moisture that s being dumped into the attic it completely cuts down on the r value of the insulation.
You should never exhaust the bathroom fan directly into the attic.
Use a layout square or framing square to draw the.
As crazy as it sounds historically most homebuilders have installed that power bathroom exhaust fan in your second story bathroom failing to direct the warm moist air from your bathroom anywhere but in your attic.
Your attic is an enclosed cold zone.
However you can vent a bathroom fan through an attic while it terminates on the roof or gable end.
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 has the same temperature as the outside which in winter across the northern us will be below freezing.
It s all outdoor air anyways right.
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.
No you cannot vent your bathroom exhaust fan into the attic.
It s never okay to vent directly into the attic even if you re attic is vented.
Use the reference hole as a landmark to transfer your measurements from the attic to the ceiling.
This will cause mold and could leave your home unlivable.
A vent fan evacuates warm and usually very humid air from your bathroom or kitchen you re most often venting steam from a shower or from boiling pots pans.
Mark the ceiling back in the bathroom measure the inside dimensions of the vent fan s intake port to determine what size hole you need.
Exhausting of the bath vent fan must indeed be to the building exterior.
It may also violate a shingle warranty.
It seems like such an easy solution just leave a bathroom vent hose in an attic.
