Plumbing Vent Pipe Height Above Roof

The re vent is the only exception since it runs horizontally.

Plumbing 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. The plumbing vent also known as a vent stack helps regulate the air pressure in your plumbing system. All open vent pipes that extend through a roof shall be terminated at least number typically 6 inches mm above the roof 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. 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.

The 6 you describe should be just fine. You are letting air into the plumbing system of the house. A vent stack is not like a chimney which requires 2 higher than any roof within 10. On a sink that would be either the rim or overflow hole.

I have a main vent and a sink vent and both are only 6 high above the roof. Just as drain pipes remove water and waste from your home the plumbing vent pipe also known as a plumbing air vent removes gas and odors. Above the roof plumbing vent height. It also allows fresh air into the plumbing system to help water flow smoothly through the drain.

Each vent pipe or stack shall extend through its flashing and shall terminate vertically not less than 6 inches 152 mm above the roof nor less than 1 foot 305 mm from a vertical surface. However it needs to be at least six inches above your fixture s flood level to keep from getting wet. A note on the main drain.