Relocating Second Floor Bathroom Vanity

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Joey Larson

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Good Morning,

I am remodeling a second story bathroom and moving the double vanity away from the house's main stack. I was wondering if I can drain the vanity on a different line to the basement and tie into the existing laundry tub drain. I have attached a diagram for what I mean, the red line is what I am proposing.

Minnesota follows UPC and I think this would be termed a waste stack which I know they don't allow...I am just not sure how this would be done another way.

upload_2019-7-1_10-42-10.png
 
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Michael Young

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Good Morning,

I am remodeling a second story bathroom and moving the double vanity away from the house's main stack. I was wondering if I can drain the vanity on a different line to the basement and tie into the existing laundry tub drain. I have attached a diagram for what I mean, the red line is what I am proposing.

Minnesota follows UPC and I think this would be termed a waste stack which I know they don't allow...I am just not sure how this would be done another way.

View attachment 54210

You're not using a vent to dump waste. According to your drawing, you're pulling a whole new branch. As long as you install a studor vent on at least one lavatory, you should be fine. The entire pipe will double as a wet vent.
 
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