Vanity supply and drain location?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by elgato, Sep 16, 2008.

  1. elgato

    elgato New Member

    Messages:
    43
    Location:
    Phoenix, AZ
    I am replacing an old 30" standard vanity with a 30" door/drawer type 33" tall.

    15" of the cabinet is covered by drawers leaving 15" to work with. Should the drain be centered in the 15" with the supplies on either side? Is 21" high for the drain about right for a 33" tall vanity?

    Thank You
    Last edited: Sep 16, 2008
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Most likely you will need to offset the supply and drain to clear the drawers. Take some measurements of the cabinet before you layout the plumbing.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,006
    Location:
    New England
    For optimum locations of things, you really need to look at the spec sheet for the sink you choose...typically, they will have the preferred location of supplies and drain. Depending on if there is a drawer right under the top of the cabinet, or it has a blank space would determine where the sink can go...one of Newton's laws...two objects can't occupy the same space!
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,635
    Location:
    Cave Creek, Arizona
    drain

    The sink drain is going to right about at the edge of the drawers. The best place for the drain is within 2 1/2" of that location so you can make the connection to the trap by rotating the trap and not need offset fittings in the pipe to the wall. Water lines can be anywhere.
  5. elgato

    elgato New Member

    Messages:
    43
    Location:
    Phoenix, AZ
    Good point! Thanks. The trap only allows a maximum of three inches from center without an offset. This is why we ask before charging in.

    Not sure what sink I will order. Does 20 - 21" sound right for drain height in a 33" cabinet?

    Thanks again.
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,006
    Location:
    New England
    The height isn't the issue, it's the depth and width between the end and the drawers. Is it a drop-in or an undermount? You need to allow room behind for the faucet unless it mounts on the sink, too.
  7. krow

    krow Plumber

    Messages:
    906
    Location:
    Ontario, Canada
    I usually use 19" to center for basin drain and 22" for basin water supply
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,635
    Location:
    Cave Creek, Arizona
    trap

    Measure the trap before you depend on its maximum offset dimension. It could be 2 1/2" for a 1 1/4" brass trap.
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