Many people think the vent pipe on their roof is to vent the bathroom steam or something of that type.
How much should septic vent pipe extend above roof.
It channels the exhaust gases to the vent and helps maintain proper atmospheric pressure in the waste system.
Why plumbing air vents are important.
This basic release system is essential as a blockage stops the tank from working.
That vent pipe actually pulls septic system odors up through to above the roof line of the home.
The vent stack is the pipe leading to the main roof vent.
Instead they serve to equalize air pressure within the dwv system and also release sewer gases into the outdoor air as all vent pipes terminate through the roof.
The septic venting pipe and system provides a septic tank the ability to move gases and air out of the tank when it fills up with waste and liquid volume.
Due to the low pressure in the pipe itself the sewage odors and gases easily find their way out and away from your home.
The sketch shown here may help explain why the vent pipe should extend.
It is a vertical pipe attached to a drain line and runs through the roof of your home.
The vent pipe of the plumbing system must extend well above the roof line according to most plumbing codes.
The purpose of this pipe is it works in concert with the roof vent pipe to allow the air pressure in the drain to equalize.
Without the roof vent pipe the drains would gurgle up into your sinks tubs and toilets.
Above the roof plumbing vent height.
906 2 each vent shall terminate not less than ten 10 feet from or at least three 3 feet above any openable window door opening air intake or vent.
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.
It may also look like a candy cane shaped pipe in your yard.
Here is the code cpc sect.
Yard based septic vent pipe.
Upc i 906 1 and 906 2.
Vents provide the necessary exchange of air so.
These gases are a natural byproduct of the bacteria that break down the waste in either your septic system or sewer line.
How to extend pvc pipe on a roof vent.
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.
This is not the case.
906 1 each vent pipe or stack shall extend through its flashing and shall terminate vertically not less than six 6 inches above the roof nor less than one 1 foot from any vertical surface.
This in turn causes the septic system to back up right to the toilets not a pleasant situation to fix.
The vent pipes are part of the drain waste vent or dwv system of a house or building and they do not carry water inside them.
