Adding Drain to Existing Stack

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Custer

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Hey all,

I am planning on adding a drain to an existing vertical stack in our basement. I am adding a utility sink in my basement and it seems like the easiest way is to tap into the existing vertical line. After reading up on a lot of other posts, it seems like the best way is to splice in a sani-tee (with PVC stubs) with 2 shielded rubber couplers and then run a vent line in between that tee and the sink's p-trap. I've attached a pic of my game plan; does it look like I'm on the right track to add this drain? Thanks in advance for any help.


drainplan.jpg
 

Custer

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It seems like this might be the only way to do it. I don't think a saddle would work/be allowed and there's not enough play in the stack to use a solvent welded coupling...
 

Reach4

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I am not a plumber.

Your plan looks good. Make sure the pipe is supported before cutting. If the vent turns into a hardship, you could use an AAV instead. Vent is better.

If you use 2 inch for the drain, rather than 1.5, you have the potential to add a washer standpipe in the future.
 

Custer

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Ok, sounds good, thanks. That's a good point about 2" for a future standpipe, although the sink is going to be used for a home brewery...
 
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