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Chimney height above the roof

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I have a 25'x35'outbuilding with a hip roof. The hanging furnace that I am installing is 125000btu natural gas Trane (used). It has a 6" flue outlet. I want to run the flue pipe 18' inside of the exterior wall, or approximently 12' from the peak.

The roof  pitch is 6/12. I was told that I should extend the pipe all the way up past the peak of the roof 2', Should it extend 2' from the point that the pipe exits the roof or all the way up past the peak of the roof by 2 '? The point of origin for the measurement is what is confusing me. Thanks
asked in House Chimney by bojac8 (130 points)
edited by darekrudy
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1 Answer

+1 vote

 

Hi Bojac8,
You can follow this link - chimney termination - to my post where this is explained. Based on the information you’ve provided it would be 1’above the roof surface penetration (unless there are vertical walls within 8'). 
 
You can also use Gama venting tables at this link - http://icpindexing.toddsit.com/documents/003046/gama%20vent%20tab.pdf – and scroll down to page #3 
 
The 2 feet minimum requirement above the roof penetration applies to vent caps that are larger than 12” in diameter.
 
Listed (approved by UL- Underwriter Laboratories) vent caps larger than 12"must be located at least 2 feet above the highest point and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet.
 
Let me know if you have any additional questions. Just click “comment” below.
answered by darekrudy (21,730 points)
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