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[gspren]

    I just put up a 14 X 15 metal roof over my stove. The smoke stack will go through about 3 ft from the lower edge on the back side. The roof is about 45deg or a 12-12 pitch. How far through the roof does it need to extend? Its a forced, fan-fed fire so I shouldn't need to worry about drawing a draft.

Gary

[willieG]

    I just put up a 14 X 15 metal roof over my stove. The smoke stack will go through about 3 ft from the lower edge on the back side. The roof is about 45deg or a 12-12 pitch. How far through the roof does it need to extend? Its a forced, fan-fed fire so I shouldn't need to worry about drawing a draft.

Gary

Hi Gary, your question can be researched on the net and also your local fire department can likely tell you what the code is in your area but  normally you draw an imaginary line from your chimney, level across your roof toward the peak. keep moving vertically up your chimney until this  horizontal line is 10 feet long. When you have reached this 10 foot distance between your chimney and your roof line, your chimney should be 2 feet higher

hope that is of some help to you.

[Ridgekid]

This might help:

http://www.outdoorfurnacefacts.com/wood-corn-heating-best-practices/best-burn-practices/index.html

[gspren]

  Thanks for the replys. I was always under the impression that the 2ft higher rule was to help with draft. Since I have a fan forced draft I am not sure if that applies and the nearest neighbors house is over a thousand ft away so I am not worried about smoke complaints. I have 2 reasons to keep it shorter if possible, one it would be easy to clean if I could still unscrew it and bring it down to horizontal like I have been doing and two that insulated stainless pipe aint cheap! I am not going to seal the roof where the chimney goes through, in fact I will leave about a half inch gap around it so that it is easy to bring the stack down through the hole. I think I might try just sticking through about 2 ft which is still shorter than the peak and seeing what happens although I guess I will contact a friend at the local fire Co. I can always go higher later if needed. I still have a few months to think about it and I still want other opinions.
Gary

[willieG]

i thinnk you can try what ever youlike, as you said you can add to it if it does not work out. the two replies you recieved so far are what in "normal practice" and most likely accepted by fire codes and insurance companies. What you do personally is up to you and your decision (i would probably do as you are thinking..give it a try and go from there) but I would  be skeptical to advise you to do something that may be, not legal. Although you have a forced draft there may be days when the conditions are right (the amount of wind and the direction) that cause yoru stove to back draft even with a blower?

good luck and post your results for future information seekers