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roobinsteen t1_jdcwn9m wrote

>Part of the complexity though is bringing up the plumbing stack from the second to third floor as there is currently none

Are you sure? Typically the vent stack goes straight out the roof. The bathroom could drain into that. The real question though, is are you going to be able to achieve the slope required for drainage if where you want the bathroom to be is not close to where the existing vent is. You may have to live with a boxed out soffit in the ceiling below the bathroom to accommodate the drains.

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andrewbt OP t1_jde82ta wrote

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

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roobinsteen t1_jde8kc8 wrote

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.

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