The vent pipe, also known as a plumbing air vent or vent stack, regulates airflow to ensure that waste and water flow through pipes that drain your house. It prevents drainage problems such as slow or ineffective drainage.
Many homeowners will experience a plumbing problem at some point in their lives. However, diagnosing the issue requires more than checking the water pipes. Sometimes, plumbing vents can become blocked or damaged and cause stoppages and other problems. It is crucial to understand this delicate part of your plumbing system in order for your drains to flow smoothly within your home. We are here to answer the most frequently asked questions about plumbing vents.
Your roof has plumbing vents that allow sewer gases to escape. The air must escape from your drains when you flush your stool, or drain the tub. Odor-related problems can play a significant part depending on where your home is located. It could be in the woods or down in a draw. Septic odor can also depend on the type and location of your septic system.
What is a Septic Vent Stack and How Does it Work?
The plumbing vent pipe is an essential part of your home’s plumbing system. It is important to understand what it does and how it works so you can diagnose any problems.
The second function of your plumbing vent is to drain sewer gases. These gases can often flow into your home from the sewer system. It can cause a foul odor and even be dangerous.
Types of Plumbing Vents Pipes
Re-Vent Pipe or Auxiliary Vent
This type is attached to the drain line, or behind the plumbing fixture. It extends up to the main vent, which goes to the roof.
This is the most popular type. This is a vertical pipe that connects to your drain line. It vents from the roof because there is no water running through it.
Air Admittance Valve
This valve opens when wastewater drains. This valve lets air in, and then uses gravity to prevent any gases from entering the room. These vents can be used to exhaust multiple fixtures.
A common vent is used to connect two fixtures that are installed on opposite sides of the wall. For example, back-to-back kitchen sinks. They are connected to the stack by a sanitary cross.
What is a Plumbing Vent?
The plumbing vent (also known as a stack) regulates the pressure inside your plumbing system. The same way that drain pipes are used to remove water from your home is the plumbing vent.
The plumbing vent pipe, also known as a plumber’s air vent, removes gas and odors. It allows fresh air to enter the plumbing system, which helps water flow through the drain pipes smoothly. The plumbing vent pipe does not allow water to flow through it. It’s a vertical pipe that is attached to a drain and runs through your roof. The main roof vent is located in the vent stack.
What Vent Types Are Available?
True vents are vertical pipes attached to drain lines that run through the roof without water. The stack’s upper portion can be used as a vent if a fixture is located near the stack or on the top floor. However, many fixtures cannot be located so you will need to find other solutions.
Why Is Venting Necessary?
A DWV system’s centerpiece is its main stack. This is usually a 3 to 4 inch diameter pipe that runs straight up through the roof. A secondary stack is a pipe that serves a branch of the system. It may be 2 to 3 inches in diameter. Branch drainpipes with a smaller diameter (typically 1 1/2″ or 2 inches) transport water from specific fixtures to a stack.
Leaked Plumbing Vent Stack
The photographs just above and below show a hidden leakage in a plumbing vent within a wall cavity. This was discovered by Cheryl Lidawer during an odor investigation.
The installer applied primer to the pvc vent pipes, but did not glue them. Finally, he assembled them.
The owners discovered multiple sewer gas leaks inside their home after much detective work and difficulty tracking down the source.