In my humble opinion dryer vent terminals should be accessible from the ground if you already have a home with a dryer that terminates at the roof be sure to have the terminal cleaned on a regular basis and consider having the terminal replaced with a dryerjack terminal.
Why not vent dryer to attic.
Venting your dryer to the attic is not only a potential fire hazard but can result in moisture problems which causes more problems.
But we don t recommend it for two reasons.
Venting the dryer outside in cold weather wastes a lot of heat.
The attic is usually colder than the rest of the house during the winter and that can create a problem for a dryer vent.
Not all dryers will allow for this so be sure to check the owners manual to ensure it can be vented in this manner.
Some homeowners use a much simpler system of venting down into a bucket of water like in the photo at the top of this page.
A vertical dryer vent is typically a problem because it acts as a moisture condenser.
To make the dyer more efficient you can buy an inexpensive heat diverter and install it in the exhaust duct of electric dryers only not gas dryers you ll save about 50 worth of heat per load in the winter.
Here are some things to look for and why the roof is not the smart choice when venting your dryer.
Dryer lint is also highly flammable.
Unlike the vents shown above left the dryerjack affects airflow by less than 01 water column inches of pressure.
The sheet metal duct is cooled by the outside air in the attic.
Cindy asks my dryer vents into my attic.
You can buy a box called an indoor dryer vent kit at home improvement stores and it manages to control most of the lint but not the water dumped into the air.
If you re having a home built try to have your builder terminate the dryer duct at a location that makes sense.
A dryer vent should be vented outside.
In these cases it may be necessary to vent your dryer through the attic.
A better roof termination.
How can i vent it outside to make it less of a fire hazard improperly vented dryers and lint buildup cause over 15 000 fires a year.
The problem with attics.
Because the dryer vent s air seal to the outdoors cannot be made between the heated space and the unheated space the second floor ceiling natural convection in the ductwork when the dryer is not running may still convey enough water vapor to the attic ductwork to cause condensation.