Strange loop/ no vent pipe?

[Tvizzle]

Has anybody seen this before? Would you run a vent through the roof if you were gutting the kitchen anyway?

This house is full of craftsmanship. I wish I had a picture of how the 1 1/4" lav is plumbed with flex pipe to the glavanized 1 1/2" stub with a tube of caulk

 

[hj]

It is somebody's idea of a quick way to install a loop vent, and has absolutely not effectiveness or function. I doubt they would have done it if a vent out the roof were an option, but if it is, that is ALWAYS the preferable way.

 

[Sponsor]

 

[Tvizzle]

Anybody know the proper way to fix it? We're putting in a new kitchen so no worries on drywall. There is easy crawl space access, and the sink is centered under the kitchen window.

Can I just santee up and vent around the kitchen window? I don't think I've ever seen a vent pipe that close to the roof edge...

 

[Sylvan]

Wow reminds me of a blind vent some so called mechanic showed me in 1970

It is a straight pipe leading up from the drainage tapped tee and gores about 4 feet high and has a cap on it

Useless but the inspector cant see how far it goes or where it connects so its call a blind vent same thing you have here

 

[Terry]

It looks like you have 1.5" pipe there. New kitchens use 2" pipe and then 1.5" for the trap and trap arm.
You can run the vent through the roof, the most common over the years, or you could use an AAV for venting.

 

[hj]

It is NOT a "blind vent". If anything it is a "yoke vent", the yoke being like the one they stick cow's heads into so they can milk them.

 

[Cacher_Chick]

You don't go through the roof at the exterior wall. Once the vent has made it into the attic, install a bend to route it to a more logical location to penetrate the roof.

 

[hj]

quote; You don't go through the roof at the exterior wall.

You DO, if the roof has an overhang past the wall.

 

[Dana]

This is probably what they were going for, but (sadly) didn't really get the picture or understand how it was supposed to work:

 

[hj]

They connected the vent back into the drain above the cabinet floor and said, "I guess this is close enough".

 

[Sylvan]

I thought the vent has to be above the flood level of the fixture

 

[Terry]

I thought the vent has to be above the flood level of the fixture

For the Island Vent used out West, there is a cleanout on the foot vent, and also for the loop.

 

[hj]

When a yoke/loop vent is the only way, it CANNOT go above the flood level without sticking through the countertop.

 

[Terry]

Can I just santee up and vent around the kitchen window? I don't think I've ever seen a vent pipe that close to the roof edge...

On an outside wall, you normally do run the vent past the window, up the wall and out through the roof. Almost all homes in Washington State will have a 1.5" vent on one side of the window above the kitchen sink going through the roof.
Most homes here have at least three vents through the roof.