New floor drain - vent questions

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by MF41, Jul 8, 2012.

  1. MF41

    MF41 New Member

    Messages:
    2
    Location:
    PA
    Hi all,

    I would like to add a 6" floor drain with a 2" fitting to an existing cement floor in a small (15'x30') 2 story workshop building.

    I have a 3" main line running close by (about 12" but could be more or less if needed) to the location of the new drain. How can I vent this drain "easily" I believe I do need to vent? I'm also not sure how deep line is buried below the floor.

    The only thing upstream from this is a toilet (which looks to be on a sanitary tee and the vent line continues up.) The only thing downstream is a double laundry tub that is vented to up above the toilets location.

    Can anyone give any pointers?

    Thank you in advance.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,749
    Location:
    Bothell, Washington
    If I were to install a floor drain on a 3" line, it would need a 2" p-trap and have a vent before it entered the 3x2 wye. For sure if a toilet is on the line it will need the vent.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,226
    Location:
    Cave Creek, Arizona
    Without being there it is impossible for us to tell you HOW to vent the drain, but it will probably NOT be an "easy way".
  4. MF41

    MF41 New Member

    Messages:
    2
    Location:
    PA
    Can I tap into the existing vent line for the sink or will I have to run a new vent line and connect it above the level of the toilet?
  5. Terry

    Terry Administrator Staff Member

    Messages:
    14,749
    Location:
    Bothell, Washington
    A new vent is installed and can be revented above the toilet. We normally figure on 42" above the floor. That puts it 6" above a counter top, which would be the normal flood level.
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