Need Help! Adding Shower to Basement Half - Drain and venting

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DeRun

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Hi. Noobie here and thanks for the add!

I'm a DIYer and want to add a shower to the half bath in basement. Not sure how to add drain line and vent. Please see pic attached. Red arrows show toilet and sink drain direction under slab. The blue circle shows where the copper vent meets slab and green arrows are 2 possible directions I believe main sewer line runs.

Any advice on how and where to add shower drain line to this and meet code? Is the one copper vent connected to the sink and toilet drain lines under slab as a wet vent?

1960s ranch

Thanks for any help in advance!
-D
 

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John Gayewski

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Make sure your sink is 2"pipe under the slab and tie onto that. As long as you run less than 8ft of pipe to the trap you won't need a vent for the shower.
 

DeRun

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Make sure your sink is 2"pipe under the slab and tie onto that. As long as you run less than 8ft of pipe to the trap you won't need a vent for the shower.
Thanks, John! It appears to be a 1.5" from what I see above the slab. Is it easy to switch out to a 2"?
 

John Gayewski

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You'd have to go back to where that 1.5"pipe ties into the branch and change it to 2". But that's just as easy as going back to the branch and tying in a new 2" for the shower.
 
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