Vent Stack Thru Roof

At the building drain system s lowest point the drain waste vent is attached and rises usually inside a wall to and out of the roof.

Vent stack thru roof.

When water drains air must replace the space that was taken up by the water. A stack vent is the extension of the waste stack to provide venting. It is a vertical pipe attached to a drain line and runs through the roof of your home. 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.

The stack has to run the most direct route through open air or be ventilated to extend to open air. Through traps all fixtures are connected to waste lines which in turn take the waste to a soil stack or soil vent pipe. The main stack is the heart of the venting system. Increasing the vent opening to three inches just before it goes through the roof in frost prone areas is another precaution that prevents blockages.

Plumbing vent pipes are connected to your drain system and are needed for water to drain properly. 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. Running a vent pipe out of the roof takes some careful preparation. Vent pipes provide this air by running outside the structure of the house.