AAV Venting Questions

[Paul Shabou]

Greeting from Wixom, Michigan.

Recently I decided to finish my basement, which led to numerous plumbing questions that I have had a hard time finding answers to online. I am the only owner of the house and had it built, assuming it passed all inspections in 2006.

In my house on the 3rd floor I have a full bath with 1 sink and an AAV, another bathroom with 2 sinks and no AAV.

On the main floor, we have 1 bathroom with 2 sinks and no AAV, another bathroom with a sink and no AAV, a laundry room sink with no AAV and an AAV under the kitchen sink.

Why do some sinks have an AAV and some do not? I see a vent pipe on my roof, but I was told years ago by someone doing roof repair that it was capped and may not be in use. Should all the sinks have an AAV?

Lastly, in my finished basement, we put in a bathroom where the contractor who built the house pre-plumbed for it. I installed no AAV in that bathroom, and now am putting in a bar sink, should that have an AAV? I am super confused. I thought my house had a main vent stack, but if that was true would I still have had AAV installed?

One additional piece of information, in my basement prior to finishing, I had 2 large soil pipes going into the concrete floor, does this mean I have 2 separate main drain line?

Thanks for all the help!!

Paul S

 

[Terry]

Sometimes an AAV will be used on a kitchen sink if it's on an Island or in front of a large exterior window and they don't want to drill the studs supporting the header.
Most of the time the fixtures will be plumbed through the roof. Having multiple soil stacks doesn't automatically mean you have two lines to the sewer. Most of the time it's just one line. Depending on where the plumbing is coming from, you may have many waste stacks, and some vents will be there for the basement plumbing too.

 

[Sponsor]

 

[Paul Shabou]

Sometimes an AAV will be used on a kitchen sink if it's on an Island or in front of a large exterior window and they don't want to drill the studs supporting the header.
Most of the time the fixtures will be plumbed through the roof. Having multiple soil stacks doesn't automatically mean you have two lines to the sewer. Most of the time it's just one line. Depending on where the plumbing is coming from, you may have many waste stacks, and some vents will be there for the basement plumbing too.

Terry,

Thank you for the quick reply, I really appreciate it. Will it hurt anything if I added an AAV to the bar sink, even if it may not need one?


Paul Shabou

 

[Sylvan]

Terry the drawing is the only way I install waste and vent

No wet vent , no circuit venting ,no loop venting and certainly no AAV 's

Shame NY decided to cut costs using the IPC code