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Advanced Plumbing and Rooter Service

231 Market Place, Suite 540
San Ramon, CA 94583

Phone: 925-383-6100

C-36 License #782789

How To Locate The Plumbing Vent In Your House

Plumbing vents are an essential part of your plumbing system. Vent pipes allow air to flow into the drainage system, so that pressure is equalized in the pipes and waste can flow passively out to the sewage or septic system. Blocked or incorrectly installed plumbing vents can cause sewer odors, gurgling noises, and poor drainage. Below we look at how to find and identify your sewer vent pipe.

Importance of Plumbing Vents

Without a vent pipe, pressure can hold water inside the pipes in your plumbing system, and prevent waste from smoothly flowing out. You can see this effect when you pierce one side of a can. A hole needs to be made on the other side of the can top to allow air to flow in and liquid to flow out the other side. Without a functional drain pipe vent, you may experience obnoxious and unhealthy sewer odors in your home, slow drainage, and strange plumbing sounds and noises.

How to Locate Your Plumbing Vent

It may be necessary to locate your plumbing vent to check on its status and conditions. Most plumbing vent stacks are on the roof of the home. However, they can be found in other places, such as at ground level or on the side of a building.

Finding the Main Drain Line

The vent pipe runs straight up and down from the main drain line in your home. The main drain line is usually located in the basement or crawl space underneath your house. You can identify it because it is a more significant pipe through which flowing water and waste can be heard. You can check this by having somebody within the house flush the toilet so you can listen to the sound of water rushing through the pipes. Where is your main drain line travels up into your home is usually directly below where you will find the plumbing vent pipe on your roof. Make a mental note of which room or area of your house this pipeline travels up to.

Check Your Attic and Roof

Once you have made a note of the general location of your plumbing vent pipe, you can check these respective areas in your attic and your roof. The vent pipe in your attic will be a significant diameter pipe that looks like a toilet drain pipe. Some plumbing vent pipes stop in the attic and are capped, or they may continue traveling upwards to finish above the roof.

If it is safe to do so, you can also use a ladder to access your roof and check the plumbing vent pipes there. Usually, any vent pipe that ends on the roof and isn’t a chimney is a plumbing vent pipe. To be sure, or put your ear up against the vent pipe and listen for the sound of water and waste rushing through the pipes. If you can hear these waste noises, you have found a plumbing vent pipe.

It’s important to note that most homes will have more than one plumbing vent pipe. In some cases, it may be unsafe for you to access the roof and inspect your plumbing drain pipes here. If in doubt, always call a licensed plumbing contractor in San Ramon to provide a professional inspection and determine the cause of any issues you may be having with your plumbing vent pipes.