How High Should My Vent Pipe Extend Above My Roof

From any vertical surface the soil pipe also known as the vent stack or stack pipe provides air for the plumbing system.

How high should my vent pipe extend above my roof.

This accounts for the 4 inch tapered head of the flashing and the minimum 12 inches of vent. If a roof is to be used for any purpose other than weather protection the vent shall be extended at least seven 7 feet above the roof. Extensions of vent pipes through a roof shall be terminated at least 12 inches above such roof unless a roof is to be used for any purpose other than weather protection. 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.

The slope is about 4 high for every 12 horizontal. How high should the plumbing vents be above there roof. According to the uniform plumbing code the soil pipe or stack pipe shall extend vertically not less than six 6 inches. This calculation from example 1 alone would give you a solid working height but if you are close to your peak then you might have more pipe height than you actually need.

The vent pipe of the plumbing system must extend well above the roof line according to most plumbing codes. The top of a chimney pipe must extend at least 2 feet above the peak of the roof if the pipe is within 10 feet of the peak. If your calculated required height falls below 36 inches 3 feet then as per our rule it must be a minimum of 3 feet on the high side of the pipe penetration. 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 mm above the roof.

I have a main vent and a sink vent and both are only 6 high above the roof. As i recall some plumbing codes state the top of the vent pipe shall be one or two feet higher than a level line 10 feet long from the vent pipe location to the roof.