andrewbt OP t1_jde82ta wrote on March 23, 2023 at 7:31 PM

Reply to comment by roobinsteen in Rowhouse bathroom addition contractor recommendations? by andrewbt

I only know enough plumbing terminology to sound like I know what I’m talking about. The cast iron vent comes up out the roof and right on the other side of the “new bathroom’s” only exterior wall, which I think is what you’re asking about. However when I said “stack” I also meant bringing up water supply lines - there is no plumbing (waste or supply) on the 3rd floor at all currently

roobinsteen t1_jde8kc8 wrote on March 23, 2023 at 7:34 PM

Ah, ok. The term "stack" refers to the drain/vent line, not supply lines. If the vent stack is right there, that's good; the hypothetical new bathroom can drain right into that with no additional venting needed. But yes, you're right--supply lines still need to be brought up to the bath location.