Hello,
If I'm not mistaken, I think everyone is missing the point. If a stove pipe comes out of a roof that is completely flat, say in between the standing seams on a standing seam metal roof, then it's not hard to flash the pipe in. But the poster said that it is coming through a corregated roof....so if you put a flashing boot down over the pipe, it will only sit on the peaks of the corregated metal and water can still run down the valleys under the boot !!! This is what I'm seeing in my mind.....tell me if I'm wrong....I've been known to be wrong once or twice lol !!!!!!!!!!
Henry and Wanda