DWV routing question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by cobalt, Mar 26, 2020.

  1. cobalt

    cobalt New Member

    Joined:
    Mar 9, 2020
    Location:
    Quebec
    Hi,

    First time posting.

    I am renovating an older building and want to correct some plumbing in the process.

    1. The 3" stack vent was reduced to 2" above the last fixture at "B" then upsized back to 3" at "C" before it exits the roof. I assume I need to replace that section of 2" with 3" to make it 3" continuous. (The building drain is 4". There is another separate 2" waste stack and a 3" roof drain. Or is this sufficient venting?)
    see Diagram D



    2. I need to offset the main stack from A to B as I can't go straight up vertically because of door. Which of 3 offset methods is the best. (see diagrams)

    2 x 45° offset - Diagram A
    Wye - Diagram B
    Tee - Diagram C

    Thanks for your comments.
     

    Attached Files:

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