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doubletall
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# Posted: 22 Nov 2019 13:56 - Edited by: doubletall
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I'm wondering what would be the preferred routing for a stove pipe in a small (10x20) cabin with a catherdral ceiling. I know its better to avoid bends in the pipe but I'm wondering if there is any advantage to having more single wall inside with a shorter chimney outside vs a longer chimney that needs to be supported on the outside.
From the drawing would "A" or "B" be better?
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AKfisher
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# Posted: 22 Nov 2019 14:22 - Edited by: AKfisher
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What type of roof is it? Metal or shingles? Pitch is 12:12? Do you get snow?
If you get snow and it is metal roof then closer to the ridge is always best, snow can and will take your pipe out when it slides. You can install a criket but those can fail.
Having a straight pipe makes it easier to clean as well.
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toyota_mdt_tech
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# Posted: 22 Nov 2019 14:30
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snow jack vs cricket also, its more of a knife to cut sliding snow. Can you locate stove near ridge? Mine is straight and stove is in like your drawing. I have a 7.5/12 pitch and we get deep snow, but it never piles too high and local installer made large pipe supports out of EMT metal pipe, never had a problem.
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AKfisher
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# Posted: 22 Nov 2019 15:39
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If I were to do mine again I would install it closer to the ridge. Our walls are 10', and another 8' to top of ridge for reference. We get a lot of snow. Having a snap lock roof panels I chose a snow break that clamps to the ridges of the panels. Seems to work well so far. I did add 3' more pipe as I wasn't getting a great draft in the winter.
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MtnDon
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# Posted: 22 Nov 2019 18:50
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A neighbor once installed a wood burning stove in a cabin with a tall cathedral ceiling. Black single wall pipe straight up to within 18" of the ceiling support box. He frequently had some low draft problems. We had trouble figuring out why? I sat down with the user manual and read line by line very carefully. There was a single line where it stated that when installing in a cathedral ceiling situation that the single wall black pipe should never be more than 8 feet. No reason given as to why. Talking to the owner of one of the older stores that sell wood stoves here, he commented that the reason was probably that too long a black pipe could cause too much heat loss to the room and reduce the draft. He also mentioned that many newer EPA approved stoves used smaller diameter 6" pipes than old stoves that were commonly 8". That was done to improve draft on newer stoves that burned more efficiently, passing less air up the pipe while doing so.
In the end, we installed several feet of insulated pipe to reduce the black run to 6 feet. That stove burned much better after that. I mention this only as anecdotal evidence to maybe read the user guide very thoroughly before committing to a long run of black pipe.
In snow country, a chimney should be fitted with crickets or snow dividers as well as sturdy braces. We can get 3 feet of build-up at times. We placed the chimney near an exterior long sidewall as the stove fit best into the design there. Snow slides off, being diverted around the chimney pipe quite well by the metal divider we installed. The exterior pipe length is well braced back to the peak. No problems at all.
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Brettny
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# Posted: 22 Nov 2019 20:28
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Streight up from the stove is the best for cleaning, keeping the chimney hot and draft. How the snow comes off the roof and other things are widely variable.
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doubletall
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# Posted: 22 Nov 2019 21:52
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Thanks for the replies. The roof is metal snap lock with a 12:12 pitch and it is in snow country. I don't have a stove yet but I'm leaning towards a Jotul 602. I can probably find a manual for the stove before I buy it and see what it calls for.
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MtnDon
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# Posted: 22 Nov 2019 22:05 - Edited by: MtnDon
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link to webpage with user manual
click on documentation near page bottom
Page 4 states the max single wall vertical run to be 10 feet.
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Brettny
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# Posted: 23 Nov 2019 09:33
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I dont see 12:12 keeping much snow if any at all.
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ICC
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# Posted: 23 Nov 2019 09:45
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It's not likely, but we get sleet that turns to snow a couple of times a year and that feezes to the steel and gives enough grip for the snow to build up. Snow dividers work along with good chimney stays. Depending on the height of the chimney maybe two sets. In theory it is best to limit the length of exterior pipe, but I don't like to have to change interior design to accommodate that unless there is no other way.
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spoofer
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# Posted: 24 Nov 2019 00:06
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a 12x12 will hold lots of snow here in ny. We usually try to vent out the side and to avoid the roof if possible. I burn a Jotul and have 3 bends in my pipe.
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Brettny
Member
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# Posted: 26 Nov 2019 12:25
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Spoofer thats a 12/12 pitch? 45*.
I guess we to get freezing rain..then its all over after that.
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spoofer
Member
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# Posted: 27 Nov 2019 21:09
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pitch is 4/12
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