Removing a single sink and installing two vanity sinks. There is an existing vent and drain as shown. My question is, do I need to intertie the waste and vent lines as shown in red or can I leave them unconnected? Thanks....
Code is stupid sometimes. There's no way in hell a double vanity will siphone another sink.
Thank all for the helpful replies.
If I understand correctly, the solution would be to use two stacked sanitees on top of the existing drain, vent out the top of the sanitees to the existing vent. I may have to offset the drain through the floor or use a short horizontal tailpiece on the far sink in order to keep the trap arm distance to 5' as it is slightly over 5' as is....Is this ok? Thanks again.
If you can move the vertical drain to bring the vent to trap distance down to less than 5', and the vent remains vertical, that is a correct installation under WI code.
A 2" trap arm on a lav is a bad idea, because the lav does not flow with enough volume to scour the 2" pipe.
To do that, a double fixture fitting is what you need. The vent still needs to be vertical to at least 42" above the floor, so based on your previous diagram, it is not clear how you would to it. There should also be an accessible cleanout for the drain.
The drawing showing both sinks draining into one horizontal pipe makes me think you might not get it.
Each trap must have it's own trap arm draining to the vertical stack. This is why the stacked sanitary tees work here, because it will be a straight shot from the trap to it's tee on the stack.
Assuming you have shelves or drawers or something below the sink, the trap arms can be offset horizontally to the back of the cabinet.
No, look at the lower part of the drawing with the label "TOP VIEW". From the front view, it looks like the drains are the same but one is behind the other, they go into opposite arms of the double fixture tee....
I see it now. You can do that, but you wont fit it all in there. It is always good to eliminate unnecessary bends. Long sweep bends or 1/8th bends must be used on the horizontal.
The cleanout can be above or below the trap arm commection on the stack.
Thank you very much for all of your help....Here is a clearer sketch. The cleanout is below the double fixture tee. Also, I have shown an offset tailpiece to the p-trap on the left sink to get the trap arm length to the 60" mark. Can you tell me what the code limit is in WI for this offset? Thanks again!View attachment 38534
This is awkward, but...
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