Hello,
I’m puzzling about this chimney space above roof. all the current pipe (wood stove) will be replaced, and a proper cathedral ceiling holding box installed, my questions are;

Can the chimney box above roof be left as dead space?

Should I line the inside of the box with mineral wool before it’s sealed up away from inside?

The outside of the box is completely lined with Ice and water shield, the tyvek your seeing is just for extra coverage until the final finish is put on. I’m in zone 3

Any thoughts on how to proceed much appreciated!