No you cannot vent your bathroom exhaust fan into the attic.
Venting into attic space.
We ve also seen homeowners have to replace all their roof decking because it became rotted from the excess moisture.
And many building codes require discharging exhaust to the building s exterior so it s just a good rule of thumb.
Ideally the range hood should be vented to the outside usually through the roof.
The problem with attics.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Venting into attic in cold weather you can also add extra moisture to the attic area that could condense on the underside of the roof and cause moisture and possibly mold.
During winter the primary cause of attic moisture issues stem from warm moist air infiltrating into the attic space from the inhabited areas and condensing on cold surfaces.
The attic is usually colder than the rest of the house during the winter and that can create a problem for a dryer vent.
In the summer good attic ventilation reduces heat buildup.
Venting into the attic sends excess moisture to that space which can cause mold and other problems.
In the winter warm moist air seeps into the attic from the living space below.
You should never exhaust the bathroom fan directly into the attic.
Especially possible if a front comes through changes the pressures and temperatures.
That keeps your attic dry and reduces ice dams.
When done correctly attic venting can reduce the potential for condensation in winter and summer.
Intake vents located at the lowest part of the roof under the eaves allow cool.
So can you vent a bathroom exhaust fan into the attic.
That cuts cooling costs and prolongs shingle life.
The following is a list of options for installing ventilation into a residential attic space.
Prior to installing the ridge vent a 1 inch wide strip of roof decking is cut out along both sides of the ridgeline to allow for air movement through the vent.