Sink drain vent height

[mofish]

I am plumbing a sink, garbage disposal, and dishwasher in a counter top height wall (36"). The sink is the less than 4' from a section of full height wall that I can use to run my vent pipe up through the roof.

My question is: Is it UPC compliant, even though part of the vent pipe run is below the overflow level of the sink?

In my drawing the dashed lines are the plumbing that will be in the wall.

Also, What diameter pipe should I use?

Thanks in advance for any advice.

 

[Terry]

With a window over the sink, the inspectors here let you run below the flood height if you use waste fittings. Not vent fittings.

 

[Sponsor]

 

[hj]

I would run the vent on an angle using 22 1/2 and/or 60 degree fittings.

 

[Terry]

I would run the vent on an angle using 22 1/2 and/or 60 degree fittings.

That's going to look good going through the three studs at the edge of the window opening.

 

[mofish]

With a window over the sink, the inspectors here let you run below the flood height if you use waste fittings. Not vent fittings.

Terry, just to clarify, this is an interior wall. There is no window, but the wall changes from a half wall (counter-top height) to a full height wall just to the right of the dishwasher. So in your drawing the nearly horizontal portion of the vent would be below the counter height until after the dishwasher. It sounds like using waste fittings is the same solution though.

 

[Terry]

My drawing shows the vent at 6" above flood level of the sink.
Inspectors have been allowing below that on a sink if the wall was too low to go above; with waste fittings.

If there is a way to arm over to the sink from the side and keep the vent vertical, that would work also. Vents run at 45 degrees are considered vertical too.

In Washington, they also allow use of an AAV for that location.

And AAV for a kitchen sink.

Or in some cases I have done this

 

[mofish]

If there is a way to arm over to the sink from the side and keep the vent vertical, that would work also.
Vents run at 45 degrees are considered vertical too.

I am trying to avoid both the AAV and the Island Foot Vent. I'm not sure what you mean by "arming over". Does the drawing below show what you mean? If so where should the clean outs go? There will be a base cabinet on the wall to the right of the dishwasher so I would rather not have a clean out there.

 

[Cacher_Chick]

What you have drawn in there is fine. Pipe the arm and waste stack in 2" with a 1.5 vent. The cleanout can be made with a wye in the sink base cabinet or a standard cleanout on the stack.

 

[hj]

He has to go through them somehow, anyway.

 

[Tom Sawyer]

Can you go with a waste/vent stack?

 

[mofish]

I am going to go with my first drawing. I will use waste fittings as Terry suggested and put a clean out below the trap. hj, I will angle the vent up as much as possible in the space I have between the drain and the full wall section. Probably at 22.5 degrees. I will probably just use 2" for every thing. I found the excerpt below from the UPC. Thank you all for your help.

{UPC 905.3}
Vents should be 6” above flood-level rim of fixture before offsetting horizontally, or need to use drainage fittings and grade to drain. Vents shall rise to 6” above flood-level rim of fixture served before being connected to any other vent.