Washing Machine and Kitchen Sink Common Vent

[Really]

Does anyone have advice on if this dry vent setup looks code compliant for UPC? I've changed the sanitary tee flow direction with the red curved line because they were oriented upside down.

 

[wwhitney]

Basic layout is fine. A few comments:

- UPC requires the sink vent takeoff to be a combo, not a san-tee on its back.

- The kitchen sink trap is typically outside the wall.

- The 4" minimum trap arm length is measured between the trap weir (the point where the bottom of the trap outlet starts to slope downward) to the near interior face of the vertical yellow vent. In practice, 2" of exposed plastic pipe between hubs is well over 4".

Cheers, Wayne

 

[Sponsor]

 

[Really]

Awesome, thanks Wayne. So it sounds like a minor adjustment with that san-tee to a combo. And yes the sink ptrap comes into the cabinet (not hidden in the wall). I'm guessing there will be more than the "double-the-pipe-width" rule for the trap arms, but I put that in there as a reminder to myself to not go too short. Thanks for your time!

 

[Jeff H Young]

btw horizontal vents 6 inches or more above flood level technically dont need fall can be dead flat I like to give them fall, especially wavey warped abs pipe its actually faster to give it a fair amount of fall and not get nit picked by inspectors , superintendants or co workers above you

 

[Really]

btw horizontal vents 6 inches or more above flood level technically dont need fall can be dead flat I like to give them fall, especially wavey warped abs pipe its actually faster to give it a fair amount of fall and not get nit picked by inspectors , superintendants or co workers above you

Thanks! I didn't know that. Ya I thought a nice slope for that horizontal vent was standard code for any condensation/moisture that could accumulate in the dry vent. Is ABS inferior, do you think, to PVC for DWV? I am only going with ABS based on availability of parts.

 

[Really]

Basic layout is fine. A few comments:

- UPC requires the sink vent takeoff to be a combo, not a san-tee on its back.

- The kitchen sink trap is typically outside the wall.

- The 4" minimum trap arm length is measured between the trap weir (the point where the bottom of the trap outlet starts to slope downward) to the near interior face of the vertical yellow vent. In practice, 2" of exposed plastic pipe between hubs is well over 4".

Cheers, Wayne

I replied below lol

 

[Reach4]

Bottom of the vertical should be long sweep or a wye+ a 45, but it looks like you are only representing a feed thru to something lower.

Thanks! I didn't know that. Ya I thought a nice slope for that horizontal vent was standard code for any condensation/moisture that could accumulate in the dry vent. Is ABS inferior, do you think, to PVC for DWV? I am only going with ABS based on availability of parts.

ABS DWV is not inferior to PVC DWV pipe. It is a regional choice, and using what is common in your area is best, even where code allows either. Transitioning can be a problem.

I think ABS may be slightly better for hot areas. https://us.misumi-ec.com/blog/plastic-pipes-temperature-rating/ says ABS allows bigger temperature range both ways. ABS uses 1-part cement vs separate primer and cement for PVC required most places AFAIK.

https://sandyvans.com/blogs/news/pvc-vs-abs-best-pipes-for-van-waste-systems likes ABS.

You might be interested to know that IPC code would allow slope either way for your horizontal vent, and even allow an inverted V, which could even hug a vaulted peaked ceiling. Condensation either way would go to a drain. I don't know if they allow dead-horizontal as UPC does.