Quantcast

Another vent thread

Help Support Plumbing Forums:

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
Hello folks. First post here.

I am in the process of remodeling the kitchen in our 99 year old house. We're past the halfway part now and trying to wrap up the kitchen stuff. Moved the sink to a new location below a window. As a result, we are now about 2 feet away from the vent with no easy way to attach the vent in the "traditional"? location just past the p trap before it turns down to drain.

I thought I would use the method used in island drains but that almost seems like overkill.

I am an engineer by trade, but I would not say that makes me an expert at being a plumber.

It's my understanding that the main purpose for the vent is to keep a vacuum from forming inside the drain which could ultimately drain the p-trap.

The more my engineering brain thinks about it, the more it seems I should be able to vent the line under the floor. The attached model shows what I have in mind (not to scale). Would this work? Would it pass code? I am using 2" PVC for the vent and drain

Screenshot 2021-02-21 195442.png
 

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
My second image is the one I'd like to use. I've found some similar examples that show this as a possibility
 

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
scratch that. We will have a dishwasher there and there is no clearance behind the washer. :(
 

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
or AAV, but I'm guessing that would be opening up a can of worms. I would prefer to not use one.
 

Twowaxhack

Professional
Professional
Joined
Feb 9, 2021
Messages
1,114
Reaction score
387
Location
United states
We did the same without the vent in the nearest wall and we used 3x2 tee and a 2” ptrap.

Later on they wanted the nearest wall vent, they wanted it to be at least 2” and have a cleanout in it since it wasn’t washed by a fixture.,

That’s how it went around here.
 

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
Thanks guys.

I've been trying to do something like your first image, Frodo. But in my case, sewer goes in the opposite direction from this diagram and I can't seem to find anything showing that setup.

Screenshot 2021-02-21 224034.png
 

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
Ok, that doesn't look right either. Vent should be in the right side of the loop? And drain on the left?
 

Twowaxhack

Professional
Professional
Joined
Feb 9, 2021
Messages
1,114
Reaction score
387
Location
United states
I’ve done a few hundred where we just stubbed a 3” pipe up under the sink. With a plug in the top. 2” trap.....

It was all code approved by our inspectors.

You’ll never fill a 3” pipe up through a 1.5 end outlet waste ✌

I service a few of these homes and my parents live in one. Its working flawlessly.

Plumbing is a theory.........
 

rbeddoe

Active Member
Joined
Feb 21, 2021
Messages
38
Reaction score
11
Location
Minneapolis
Two...are you saying I could just have a 3" drain? My sewer is not 3" however and wouldn't be able to take 3" all the way there. At least, not yet. Maybe in the future.

1614005560269.png
 

Twowaxhack

Professional
Professional
Joined
Feb 9, 2021
Messages
1,114
Reaction score
387
Location
United states
Two...are you saying I could just have a 3" drain? My sewer is not 3" however and wouldn't be able to take 3" all the way there. At least, not yet. Maybe in the future.

View attachment 27903
I’m saying it would probably work but it doesn’t meet your plumbing code.

Just like you’ve drawn but the trap is 2”.
Here’s a pic.
EAB7AE2B-1C03-4E9B-810E-8E5506D1C269.jpeg
 
Top