I was at a house yesterday where I asked the seller why he was using a long flex hose running across the floor from his dryer to a vent on the side of his house and not just run a smooth wall steel duct up through the ceiling, across the attic and out the side of his gable roof wall. He said at one time he did, but when the city building inspector came to inspect his new water heater, the inspector pointed to the vertical duct and told him that was a code violation.
I called an inspector friend of mine and he said the flowing lint will loose energy and fall back down, creating a fire hazard. Made sense to me at the time.
I furthered researched IRC chapter 15, section M1502 and I see nothing against vertical rises.
So is running the dryer duct up to the attic and out the side of the house a code violation?
Thanks in advance for you help.
Louisville Home Inspections