Vent question

[Kevinjm4]

I realize my s trap is not advisable, and I can fix it if need be, it was inherited with the house we bought. (Edit to the photo - there is a dishwasher between the sink and wall the vent goes up in)

My question is should I replace this with a p trap? And two, is the vent doing anything in this system? It does go through the roof eventually.
If I replace the s trap with a p trap, will leaving that vent below the floor be my vent at that point or should I add an aav (I’ll have enough room to run it up the side of the sink to just beneath the underside of the counter)?

 

[GReynolds929]

The "vent" below the floor is useless in that configuration. Unless the take off will be at the trap arm, I would just add an AAV.

 

[Sponsor]

 

[Kevinjm4]

The "vent" below the floor is useless in that configuration. Unless the take off will be at the trap arm, I would just add an AAV.

i updated my photo to show the dishwasher there which is probably why it’s vented the way it is. So, make it a p trap and add aav?

 

[Reach4]

So, make it a p trap and add aav?

If you don't smell stuff, I would leave it. If Washington later allows AAVs in the code, or if you smell sewer smells, you might consider making the change then. I see there was an attempt to get an amendment... https://sbcc.wa.gov/sites/default/files/2022-04/057_Section 913_UPC.pdf

Does the dishwasher drain line feed into the sink drainage?

Is there a vent thing outside (non-roof)? Washington has a unique permitted venting for dishwashers. "Johnson tee". Maybe you have that, and did not notice. https://terrylove.com/forums/index.php?threads/johnson-t-advice.15988/ I don't think that applies to kitchen sinks, but I am not sure.

 

[Kevinjm4]

If you don't smell stuff, I would leave it. If Washington later allows AAVs in the code, or if you smell sewer smells, you might consider making the change then. I see there was an attempt to get an amendment... https://sbcc.wa.gov/sites/default/files/2022-04/057_Section 913_UPC.pdf

Does the dishwasher drain line feed into the sink drainage?

Is there a vent thing outside (non-roof)? Washington has a unique permitted venting for dishwashers. "Johnson tee". Maybe you have that, and did not notice. https://terrylove.com/forums/index.php?threads/johnson-t-advice.15988/ I don't think that applies to kitchen sinks, but I am not sure.

The dishwasher does drain into one of the vertical sink drain lines. And no the only vent is going through the roof, as shown in my sketch

 

[Kevinjm4]

If you don't smell stuff, I would leave it. If Washington later allows AAVs in the code, or if you smell sewer smells, you might consider making the change then. I see there was an attempt to get an amendment... https://sbcc.wa.gov/sites/default/files/2022-04/057_Section 913_UPC.pdf

Does the dishwasher drain line feed into the sink drainage?

Is there a vent thing outside (non-roof)? Washington has a unique permitted venting for dishwashers. "Johnson tee". Maybe you have that, and did not notice. https://terrylove.com/forums/index.php?threads/johnson-t-advice.15988/ I don't think that applies to kitchen sinks, but I am not sure.

The dishwasher does drain into one of the sinks vertical drain tailpieces. And no there is no unique vent for the dishwasher. Sorry I didn’t realize I already replied it didn’t show up until I posted this one

 

[GReynolds929]

Your trap is not vented in the configuration the diagram shows. The vent shown does nothing for the sink or dishwasher.