I have a question about a chimney chase. The chase is in the side of a two story house. The chase begins at the first floor and goes up past the roof line (hop roof) about 12 feet. From what I have read, the inside of the first and second floor walls of the chase should be insulated and sheetrocked. When the chase leaves the top of the second floor it should be firstopped (and between the first and second floor as well). When the chase becomes free standing is where I have much conflicting advice. By code I need to sheet rock the inside of the entire chase, but what about insulation once I hit the roof line? I am assuming the chase is not outside the thermal envelope of the building and insulation may only help the flue draw better? My main concern is do I need to vent the chase above the roof line? I basically have an enclosed boc that is exposed to temp extremes. Anyone have advice or experience with this?

Thanks. You vented the chase at the bottom, what about at the top? I am thinking of having my cap made with a penetration diameter that is slightly larger then the flue so air can escape from the chase. Are your chases insulated from the rooms?