Venting Clothes Dryer Into Roof

The international residential code allows you to run a dryer vent through the attic but you can t terminate it there.

Venting clothes dryer into roof.

Doing so would fill your attic with warm moist air that could rot the framing. But we don t recommend it for two reasons. 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. Air velocity reduction from friction loss promotes lint build up and makes the dryer work harder to completely dry each load.

When venting dryers for long distances use rigid metal pipe with as few elbows as possible. Dryer vent specialists will tell you that a vertical approach to installing a dryer vent is inefficient and creates a fire risk for a home if it goes unchecked. This is one of the most common mistakes we see from people who are not experienced with air ducts. When bath fans and clothes dryers vent through the roof they melt a bunch of snow.

After the snow melts below the vent it ll probably freeze again farther down on the roof. Every turn increases friction loss unless you use non restrictive elbows. For dryer efficiency and safety the shortest and straightest ducting route is always best. It is not advisable to vent a dryer through the roof.