Plumbing Vent Pipe Height Above Roof

It also allows fresh air into the plumbing system to help water flow smoothly through the drain.

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. 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. On a sink that would be either the rim or overflow hole.

The plumbing vent also known as a vent stack helps regulate the air pressure in your plumbing system. However it needs to be at least six inches above your fixture s flood level to keep from getting wet. The slope is about 4 high for every 12 horizontal. A note on the main drain.

Above the roof plumbing vent height. 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. You are letting air into the plumbing system of the house. 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.

The re vent is the only exception since it runs horizontally. The 6 you describe should be just fine. 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.