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Civil engineer reviewing blueprintThe first question to answer as you plan for plumbing a new fixture or an addition to your system is, “How will it be vented?” While designing a plumbing system, you may choose from several venting types; each option may present problems or complications. Your Los Angeles plumber, Patriot Plumbing can do this for you! If you are building an addition on your home, some walls may need to be ‘fattened out’ to contain Stacks, or vent runs… Lets go over venting.

Vent types

A true vent is a pipe that attaches to a drain which travels up and through the roof (VTR) .

If a fixture is in close proximity to the main stack, and on the top floor, the part of the stack above the drain serves as the vent. This is an example of Stack venting most often, this is not the case, and creativity comes into play when planning a venting system.

A Future vent is a vent, which is located in the basement, and runs up to the attic, tying into the Stack below the roof, or, left capped in the attic and the basement for future use, should you intend to install plumbing fixtures in the basement, such as a bathroom.

If two fixtures are back to back, they may tie into the stack with a Double wye; this is called a common vent and can be found on back-to-back sinks, and toilets such as in commercial Mens/womens bathrooms, where they share a common wall.

If a plumbing fixture is near a plumbing stack, a wet vent could be used.. In the case of a tub that is close to a stack, it can be vented thru the pipe that drains it.. This is a common practice known as ‘stack venting’.

For a bar or island sink, where no walls are available to enclose a vent pipe,, code may allow a bow vent. If re-venting is difficult and wet venting isn’t allowed, a separate VTR (vent thru roof) may have to be installed by your licensedLos Angeles Plumber, Patriot Plumbing.

An air admittance valve (AAV) or mechanical vent opens to let air in when waste drains, then gravity closes it to keep sewer gases from entering  into the room. Codes in many localities allow these relatively new devices to take the place of vent lines. AAVs can be used to vent multiple fixtures. They are usually installed at least 4” above the ‘flood level’ of a fixture. Your LA plumber, from Patriot Plumbing will be able to tell you if they can be used under certain circumstances.

The critical distance

A lot rests on math in these situations;An LA plumber can be sure to measure all factors correctly, taking into consideration developed length, fixture units, and venting types used. These are the reasons why plumbers need to be licensed. For anyone who thinks plumbing consists of remembering ‘hot’ is on the left and ‘cold’ is on the right, you need to take another look!

There is a lot that goes into figuring size and location of the venting for your plumbing system. Trust it to an LA plumber like the pros at Patriot Plumbing, and you will get a flawless drainage system with years of great service. If you are putting an addition on your home, and need to modify your plumbing system, contact Patriot Plumbing. We have been satisfying the plumbing needs of the LA area with over 40 years of service! We can be reached at 800-349-6349