Quote:
Originally Posted by sphelps
Double sinks share a pee trap, so it's no different than a single. In theory if sinks are close enough you could do the same but with sinks in different rooms I doubt it meets code. I'm pretty sure you can tie into the sink vent a certain way but I also think the size of the vent depends on the number of drains. Chances are the floor drain in the mech room is also sharing the bathroom vent and he's adding two more drains. So it's something to look into.
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I can weigh in on this one. As long as you use a sanitary-T then it meets code. I have this in my basement and it is one of the few things the plumbing inspector passed me on in the first attempt. This is a sink in a mini-kitchen area and a bathroom sink behind the wall and they share a rough-in.
My inspector didn't care so much about any of the water supply lines, only about how things drain and how they vent. So I'm reasonably confident in this assertion - however with the said, code can and does change from time to time.
If ever in doubt however, the best thing to do is ask the city inspection department. Call 311 and ask to speak to the permit inspectors, there will be a manager of the actual inspectors who come to you yours house on phone duty 8am to 4pm, you usually don't have to wait beyond a couple minutes on hold and then you can ask specifically about things that they can pass or not pass. Wish I had known this before my first inspection. I asked a licensed plumber about something and he told me it was code, only to find out it was not code after all and thus failed the inspection. You'd think the professionals would know but they don't always. Just go straight to the source. They'll tell you straight up what they are looking for.