Can I run these plumbing lines like this?

by James F   Last Updated July 12, 2019 01:21 AM - source

After calling about 8 companies and only having two come out who no longer answer, I'm going to give this one a shot before throwing in the towel. This is via permit and I'd like to be super sure before the inspection. This is in Michigan and I believe we follow a modified version of the 2015 IBC, if that helps at all.

I have a small old room that had been modifed to be a laundry room and we'd like to make it a bathroom. It is on the second floor of a house, with a 3" waste/vent in one of the walls. The proposed layout is shown here:

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The red circle is the waste stack. The following image shows sink (bottom left), shower (bottom right) and toilet (top) drain locations and how I think they should connect to the drain. The joists are 2x10, but actual is a hair less than 9 and have been sistered. The top plate runs under the toilet and the toilet drain would enter an interior kitchen soffit before turning to the stack.

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The toilet is on 3", shower on 2", sink on 1.5".

I have the following questions if you could help:

  1. Does the run distance for the sink and/or shower require venting? I think it's ~4 or 5 linear feet in sink drain option 2 to the shower drain. Shower drain is ~6 or 7 feet to the main stack.
  2. Addendum to above: There is a much closer 3" vent stack a few feet behind the wall - are the vent and drain pipes required to be the same?
  3. I can't figure out a location to put a cleanout - is it required and where would be a good spot?
  4. I think reaming out the existing/newish sanitary tee on the 3" stack (see below) and fitting a 3" street tee makes sense. Right below it, you can see another sanitary tee from a toilet in the next room. Issues with that?
  5. Initially, I was told by the plumber they don't usually see pressure tests with this kind of stuff when inspected, but in the case of it being necessary, how could I possibly set that up?

Thank you for your time. Some views of the stack from in the soffit:

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