06-09-2012, 11:24 PM
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.