Plumbing Design for new 2nd floor bath--which one?

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mammoth

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Hello all,
I'm building a 2nd floor master bath (in empty space, nothing there before, a home from 1900), and I'm designing the drains. Here are pics--they're not totally to scale, but I listed room dimensions. The "Bath-Layout" pic is the actual birds-eye layout. The "Drains-without-sink" pic is the whole design from basement to 2nd floor (minus the sink drain, which is in the Option 1 and Option 2 pics).
OK:

1) I have a vertical 3" stack down to the basement and up to the attic. I want to put an AAV in the attic as per the pic, but I want to make it a real one through the roof in the spring (I want warmer weather to work on the roof and make sure I do it right--yeah, a little chicken).

2) I want to tie the drain in the basement into the current drain system at a half-bath drain a plumber put in for me. I want to extend the end cleanout he made and put my own cleanout to replace it.

3) The toilet is vented at the stack--it's 7' from the flange to the stack. (I wanted to vent the toilet from the sink stack behind it, but I can't see how to do that via code. Like, I can't use a closet bend with a sweep for the vent. And I get that, it's fine.)

4) So--the sink drain. I can drain the sink into a wye that I can put in the toilet drain as per the Option 1 pic. I was thinking that any sink water would help move toilet waste along toward the vertical stack. OR, as per the Option 2 pic, I can run the sink drain to the vertical stack itself and connect it either above the toilet sanitary tee or below it, whatever is better (I didn't find or understand a clear answer for this in my searches).

So, Option 1 or 2? Or something else? any comments would be welcome. Thanks!
Dave
 

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  • Option-1-sink-drain-into-wye-toilet-drain.jpg
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  • Option-2-sink-drain-run-to-stack.jpg
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