Vent Stack Thru Roof

The uppermost part of the waste stack that connects to the uppermost part of the roof is the stack vent.

Vent stack thru roof.

The main stack is the heart of the venting system. It also allows fresh air into the plumbing system to help water flow smoothly through the drain pipes however no water runs through the plumbing vent pipe. Vent pipes provide this air by running outside the structure of the house. Running a vent pipe out of the roof takes some careful preparation.

A stack vent is the extension of the waste stack to provide venting. The vent stack is the pipe leading to the main roof vent. Increasing the vent opening to three inches just before it goes through the roof in frost prone areas is another precaution that prevents blockages. It is a vertical pipe attached to a drain line and runs through the roof of your home.

Through traps all fixtures are connected to waste lines which in turn take the waste to a soil stack or soil vent pipe. The stack has to run the most direct route through open air or be ventilated to extend to open air. When water drains air must replace the space that was taken up by the water. If you can t put the main stack through the roof most local plumbing codes allow you to put it through a wall instead but there are conditions.