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Planning to install woodburning stove one day. The plan includes exposed stovepipe running up through a loft space, through attic, and out to roof chimney. I know the stovepipe comes in black and stainless steel, but I'd rather the look of copper. The house is made of Cedar with Copper Cupula. The look matters.

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Not as much as safety. Check with your local planning office to see if they allow it. –  Fiasco Labs Dec 9 '12 at 19:43
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2 Answers

You need to use a listed insulating stovepipe anytime combustible construction is penetrated. These pipes are also listed to be enclosed by construction. Thus it seems acceptable to me to install the listed stovepipe and enclose it inside a decorative copper tube.

For good measure, you should probably have some provision for venting the resulting annular space at the top and bottom of the copper tube.

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+1 for use of vocabulary!! –  Trout Dec 9 '12 at 22:35
    
@Trout +1 for calling to attention the vocabulary!! –  Bob Roberts Dec 10 '12 at 21:29
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Flue fires and the lack of structural integrity of copper under this kind of heat point to no.

A custom job where you have steel stovepipe copper plated will be your solution, copper discolors under heat and picks up fingerprints so those conditions will need to be assessed.

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