Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Venting into attic space.
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.
That keeps your attic dry and reduces ice dams.
You should never exhaust the bathroom fan directly into the attic.
The attic is usually colder than the rest of the house during the winter and that can create a problem for a dryer vent.
The problem with attics.
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.
In the summer good attic ventilation reduces heat buildup.
When done correctly attic venting can reduce the potential for condensation in winter and summer.
The following is a list of options for installing ventilation into a residential attic space.
Venting into the attic sends excess moisture to that space which can cause mold and other problems.
That cuts cooling costs and prolongs shingle life.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
No you cannot vent your bathroom exhaust fan into the attic.
It is definitely not a good idea to vent a range hood into the attic.
And many building codes require discharging exhaust to the building s exterior so it s just a good rule of thumb.
So can you vent a bathroom exhaust fan into the attic.
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.
In the winter warm moist air seeps into the attic from the living space below.
We ve also seen homeowners have to replace all their roof decking because it became rotted from the excess moisture.
Intake vents located at the lowest part of the roof under the eaves allow cool.
Ideally the range hood should be vented to the outside usually through the roof.