Vent Pipe Height Above Roof

Many people mistakenly think that the pipe always has to be 2 feet above the roof peak.

Vent pipe height above roof. All open vent pipes that extend through a roof shall be terminated at least 6 inches 152 mm above the roof and not less than 2 inches 51 mm above the invert of the emergency overflow except that where a roof is to be used for any purpose other than weather protection the vent extensions shall be run at least 7 feet 2134 mm above the roof. Vent pipes should extend to outdoors above the building roof and should terminate vertically not less than 6 above the roof surface nor more than 24 and must be at least 12 from any vertical surface such as a nearby sidewall. Upc i 906 1 and 906 2. From any vertical surface the soil pipe also known as the vent stack or stack pipe provides air for the plumbing system.

A vent terminal and depending if the roof is strictly for weather protection it terminates about 24 above the roof. Above the roof nor less than one 1 foot. You are close to your eave and you find that your measurement is 18 feet from peak to penetration on a 4 12 pitch see figure 3. The re vent is the only exception since it runs horizontally.

A note on the main drain. According to the uniform plumbing code the soil pipe or stack pipe shall extend vertically not less than six 6 inches. I am sure the plumber put it at that height for the inspector. You should be able to cut that vent shorter but stay above the roof line.

On a sink that would be either the rim or overflow hole. Single wall metal pipe shall terminate at least 5 feet 1524 mm in vertical height above the highest connected equipment draft hood outlet or flue collar. The vent is supposed to be 10 away or 2 above any window. We install our roof vents 6 to 8 inches above the roof line.

For 18 feet of run you would have a rise of 72 inches. Single wall metal pipe shall extend at least 2 feet 610 mm above the highest point where it passes through a roof of a building and at least 2 feet 610 mm higher than any portion of a building within a horizontal distance of 10 feet 3048 mm. However it needs to be at least six inches above your fixture s flood level to keep from getting wet. Above the roof plumbing vent height.

You must also consider the snow line so the pipe does not get covered. For those stinky vents consider installing odor hog vent caps see image on the roof vents.