Would be thankfull for some advice...waste stack ques.

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mnzpasquale, Jul 1, 2010.

  1. mnzpasquale

    mnzpasquale New Member

    Messages:
    8
    Location:
    New York
    Hi Guys, first hav to say really like the site, its great...
    Heres my problem, I am adding small powder room and need advice on connecting to main stack.
    Layout is done, everything vented and proper pipe sizes,,, just want opinions on best way to connect to main stack. I got my diamond torch blades ready for cutting but I am not sure if a wye or tee fitting would work best? And how to drop down the last 3' within a 4' span?
    I am going to hopefully include a rough drawing with this post ( I'm new so I hope I can do it)...

    New York State Code

    Attached Files:

    Last edited by a moderator: Jul 2, 2010
  2. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    a sanitary Tee is always the preferred fitting for joining to a vertical stack.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,267
    Location:
    Cave Creek, Arizona
    WHO said the new piping is correct? If this is a vertical stack, then a "Y" with the branch rising up to a 45 which then levels the pipe out to meet your connection.
  4. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Good point but I have no clue what is above or what the new piping will look like.
  5. mnzpasquale

    mnzpasquale New Member

    Messages:
    8
    Location:
    New York
    Thanks for reply guys... I am thankfull for your advice... sorry for confusion, I thought showing the joists would show it is a vertical stack, other info I should include is that I am only adding toilet, sink was existing... I was able to place wye within 4' of toilet drain for 2" vent that goes to attic and connects to existing vent ( I made sure to roll wye and go 45 vertical into wall as not to hav flat vent as u guys always advise against) so really my question is just about connecting 3" to 4" cast iron vertical stack. Is this new pic. what u guys mean? I used 45 elbows (2) to drop below joist because someone said it is better flow. I am just trying to get plan...hoping u guys can advise me on whats best and correct...thanks again.

    Attached Files:

  6. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

    Messages:
    679
    Location:
    Houston, Texas, United States
    Where is your vent line coming off that 3" waste before 4" stack ?
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,267
    Location:
    Cave Creek, Arizona
    IT looks like it will work, although if I were doing it, I would have used a 45 and a 60 degree fitting to make a "rolling 45 angle rather than two 45s and a 90 combination.
  8. mnzpasquale

    mnzpasquale New Member

    Messages:
    8
    Location:
    New York
    Thanks HJ.. I will do it like u suggest...I trust your advice is the better way

    To answer Mac, my vent is about 3' from flange, I rolled wye coming 45 up to wall then straight up to attic connecting with existing roof vent.
  9. mnzpasquale

    mnzpasquale New Member

    Messages:
    8
    Location:
    New York
    Again thanks for the comments...really do want as much advice as you guys can give, this is all theory right now as I havent glued anything, just dry fit... so more advice is welcome

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