Need help with adding new basement sink to main stack.

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cleon

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Hello all - first post!

In my basement I have a 3" copper stack that extends straight out through the roof. It services only the 3pc bathroom on the main floor.

I would like to add a bar sink / dishwasher in the basement and tie into that stack. It would be approximately 5' from the stack.

My question is do I need to add vent pipe as well or is the stack sufficient? And if I need a vent, where is the appropriate place to tie it back into the stack?

Attached is a diagram...

basement.jpg
 

hj

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The upstairs sink will either be vented, or not, depending on whether it has an independent pipe back to the stack. You connect the vent back to the stack 42" above the upstairs floor, or in the attic.
 
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