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Re: corrugated roofing and chimney flashing question
If you cut the corrugated to within 1/4" or so you could just silicone caulk the chimney to it. It's nice if the panel seam runs through the opening, easy to layout and cut. If not just measure twice....
If you're lucky or layout the panels so you do have the seam splitting the pipe, also caulk that seam inside the overlap on the uphill side. It won't leak and you won't have ugly orange hi-temp boot to look at or pay for.