Sealing up flue pipe through cathedral roof?

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Mar 21, 2014
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After poking around through several sources I can't seem to find any relevant information on the proper air sealing and insulating of an insulated stainless flue pipe as it passes through a cathedral ceiling rough opening.

Air sealing between the heat shield and flue pipe on the warm side. With poly and tape aside due to its inherent melting point, what's the common practice here to get an air tight seal?

Insulation between the heat shield and flue pipe. I was thinking I would fill the space with Roxul but it seems some recommend leaving this space unfilled.

Thoughts?

Thanks
 
Great question. I see everybody talking about air sealing the bathroom fans and light fixtures and then no mention of air sealing the flue/ceiling transition.
 
From the photos, this product looks like fiberglass insulation. Is there a problem with using regular fiberglass insulation, the type without the Kraft paper or with the paper torn off? I used to have some I had used around my chimney where it goes through the ceiling. I removed it a few yr. ago when doing some other maintenance and never replaced it. Been thinking about whether I want to just leave it open or stuff some more fiberglass up in there.

I am not too very concerned about the little heat loss up through that patch but been meaning to ask here on the forum and this is a good opportunity to do so. I am replacing my old stove with a Keystone and the chimney pipe is Selkirk double-walled stainless.
 
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