From the irc and other plumbing codes.
Hight of vent pipe above roof park county colorado.
1 5 feet above the roof surface.
You must also consider the snow line so the pipe does not get covered.
Roof pitch rise run in inches.
For the next example you have a shorter chimney height.
2 0 feet above the roof surface.
For 18 feet of run you would have a rise of 72 inches.
You should be able to cut that vent shorter but stay above the roof line.
But it is on the edge of the roof so that should not be a problem.
2 5 feet above the roof surface.
Where a roof is to be used for any purpose other than weather protection the vent extensions shall be run at least seven feet above the roof.
Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run.
Open vent pipes that extend through a roof shall be terminated at least 6 inches 152 mm above the roof or 6 inches 152 mm above the anticipated snow accumulation whichever is greater except that where a roof is to be used for any purpose other than weather protection the vent extension shall be run at least 7 feet 2134.
Extension of vent pipes through a roof shall be terminated not less than 12 inches above it.
I am sure the plumber put it at that height for the inspector.
The 2018 international residential building plumbing mechanical fuel gas energy conservation existing building and property maintenance codes as amended by larimer county take effect for all permits initiated on or after february 1 2019.
If the previous calculation results in the required height of 64 inches we can see that the top of the pipe will not rise above the roof peak but would still meet the requirements of the rule.
Minimum height above the roof surface 1 flat to 7 12.
The vent is supposed to be 10 away or 2 above any window.
P3103 1 roof extension.
If the roof area is for people then it is 7 ft above the roofing surface.
Table of rooftop chimney clearances for metal b vent chimneys flues.
A vent terminal and depending if the roof is strictly for weather protection it terminates about 24 above the roof.
Vent hight above roof cold climate.
1 0 foot above the roof surface 1 7 12 to 8 12.
Permits initiated before february 1 will stay under 2015 code requirements.