The sheet metal duct is cooled by the outside air in the attic.
Dryer vent through roof.
Cleaning lint buildup from roof vents is difficult and nesting birds and squirrels often find roof vent caps irresistible.
Once the vent is exposed use a vent brush first clean the exterior surfaces.
Before you clean a dryer vent on the roof vacuum out the vent behind the dryer since it s easier to clean out the length of the vent from the ground floor.
If your laundry room has access to an outside wall cut a hole and install a standard dryer vent.
When bath fans and clothes dryers vent through the roof they melt a bunch of snow.
Then get on the roof and peel back any shingles that may be covering the vent as well as the guard.
Be careful you don t cut through any studs electrical wires or pipes in the process.
I think the roof is a stupid spot to terminate clothes dryer vents because it s difficult to clean and it s a major contributor to ice dams.
Considering that back pressure higher than 6 wci is generally recognized as inefficient you can see that venting through the roof with non dryer specific vents is immediately problematic.
Difficulty cleaning dryer vent.
Vent a dryer through the roof only as a last resort.
Keeping a clean dryer vent is much easier when you can safely reach the exit.
Check with your appliance dealer or local building inspector for recommendations about the best roof vent cap to use.
The less back pressure is created by the roof vent the more efficiently the system performs.
These terminals need to be cleaned on a regular basis to prevent lint buildup.
The vent should exit the building through the roof or wall at least 3 feet away from any other building openings and the vent cover which must not include a screen should allow dispersal of.
If venting outside isn t an option you can vent the dryer out of the attic through the roof using a special roof vent to keep rain out.
As soon as i m in charge there will be no more venting of clothes dryers through the roof.
Dryer vents should always be vented through the side of the house and not vented through the roof and ideally the exit should be fairly close to the ground.