It's 'Bottle' Kevin ,and no she's not a liberal... Batman , I have re - thought and do not want to damage the integrity of my roof , I want a dry work space . So , we found some 4" pipe that will form around the exhaust on the Smoker . We will run it (from an elbow 90* ) four feet or so and another Elbow with the top about a foot above the roof. Maybe 5' at most and only 2' of that is higher than my existing exhaust. This way I CAN play before any structural mods. , just an idea. Got $250 invested on a budget that's gone. Got to play safe... Ideas still welcome , need all the advice I can get . Been too long since I was Building my own Smokers. But I like a tall stack... have fun and . . .