Posted by Dennis Genereau, Jr. on September 14, 2007 at 11:19:16 from (136.234.34.226):
In Reply to: OT: building a flue posted by mark on September 14, 2007 at 08:11:34:
My brother is a licensed contractor here in Minnesota. I asked him your question and this is what he told me. Assuming you are burning wood or coal, the chimney must be three feet above the ridge if it comes out of the ridge. If it comes out below the ridge, you have two options. The first is to bring it up until it is three feet above the ridge, which would make the most sense if the chimney comes out just below the ridge. The second is a little more complicated, and applies to chimneys that come out near the bottom of the roof. First, you have to bring the chimney up high enough so that if you ran a horizontal line across the top of the chimney towards the roof, it would travel 10 feet before it would the touch the roof. Then you have to go three feet above that. In other words, if your roof has a 12/12 pitch (45 degree), your chimney would need to be 13 feet above the roof line where it comes out (10 feet to the horizontal line, then three above that). The lower the pitch, the lower the chimney. In all cases though, once you are three feet above the ridge line, you are high enough. It does not matter whether your chimney comes through the roof or up the side. He was not sure what the specs were if your heat source is gas or oil.
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