Shared vent design - remodel

[Connor MacManus]

Hi all Remodeling my kitchen. In Minnesota
sink will be an island sink. I have a single vent stack for the kitchen sink and a utility sink in the basement below - they shared the vent stack previously, the utility sink would have been wet vented if I understand the terms correctly. I have a diagram plan (disclaimer: I have zero art and drawing skills). Can someone help with verifying this is a good plan or correct me please?

 

[WorthFlorida]

You need a drain to the waste pipe from the vent should the sink ever backup or rain water gets into the vent pipe. If your local code allows, an AAV can be used. Google "island sink venting".

https://terrylove.com/forums/index.php?threads/island-sink-venting.43049/

 

[Sponsor]

 

[Connor MacManus]

My bad art may not show that. That is a combo vent I have in the sink for the island. AAV is not allowed in MN. The vent line from the combo does have ability to drain via the line coming up from the basement that I am tying into via T. I’ve seen that diagram. It’s tough to translate that into the vertical design In conjunction with adding the utility sink piece in there.

 

[hj]

You CANNOT tie the two vents together like that. ONE of them has to be 42" above the upper floor before they can be combined. The "loop" vent's horizontal line CANNOT "jump upwards until AFTER it connects to the drain.

 

[Terry]

Like hj mentions, reventing is six inches above flood level of the floor served.
The downstairs would revent at 42" on the second floor.

 

[Connor MacManus]

Thank you both. So like the attached then? I bring a parallel vent line from the loop up and tie in above 42”. So the existing vent from the basement would only serve the utility sink and drain line under concrete and the loop vent horizontal would run under floor and come back up parallel to the existing vent and tie in via wye or combo T. Do I have that right?

 

[Connor MacManus]

Oy. I just realized I took my drain tie in off that loop horizontal. Back to the drawing board.
Fixed the drawing I think.