Lavatory Drain

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by JB412, Jun 9, 2012.

  1. JB412

    JB412 New Member

    Dec 4, 2006
    I am helping my son in law install a bathroom in his basement that was plumbed with drain and water lines when the house was built 2 years ago. The toilet and tub were no problem. Where I do have a problem is with the drain for the lavatory. The floor drain is centered between the water lines. Because they went with a 48" lavatory, it puts the center of the lavatory drain about 18" from the floor drain pipe. What is the correct way to deal with this? Do I put the trap directly under the lavatory drain then run a horizontal pipe over to the floor drain and elbow it down at that point, or do I com down from the lavatory draw, install an elbow and run horizontally over to a trap and striaght down to the floor drain? Any help would be appreciated.

  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Actually NEITHER, without a vent the drain will NEVER operate properly. Whoever installed the drain, (and, the trap should be under the sink, NOT be under the floor), should have put it in the wall with a vent going upward, OR it was installed that way, but you moved the wall so the pipes are under the sink and could not continue the vent the way it was designed.
  3. Sponsor

    Sponsor Paid Advertisement

Similar Threads: Lavatory Drain
Forum Title Date
Plumbing Forum, Professional & DIY Advice Lavatory drain gasket not seating Sep 27, 2015
Plumbing Forum, Professional & DIY Advice Lavatory drain replacement - gasket? Mar 16, 2015
Plumbing Forum, Professional & DIY Advice Double lavatory not vented, gurgling, not draining well Dec 7, 2014
Plumbing Forum, Professional & DIY Advice lavatory drain leak below integral lav/counter at top rubber gasket Oct 15, 2013
Plumbing Forum, Professional & DIY Advice Lavatory push-up drain - need more travel Apr 14, 2013

Share This Page