Move washing machine

[Hardman]

I am adding a laundry room and need to move my washer and dryer. The move will be apx. 4' along the same wall. The drain transitions from cast to pvc with a trap under the slab. My question is - do I need to move the trap or just 90 over to the new location? My house was build in '76 so I'm sure things are done differently today - if I need to add a vent etc. please advise.

[hj]

The trap under the slab is not permitted any long, for several reasons, and adding pipe to the portion above the floor would just exacerbate the problems. There should be a vent in the wall so that you can attach a new proper drain pipe to it.

[Hardman]

If I remove the under slab trap - can I transition to pvc and just 90 up to a sanitary t and over the 4' then trap under the new washer box, or should I make that 4' move under the slab and come up under the new location?

[Terry]

Yes, removing the existing trap in the slab with a long turn 90, coming up to a santee and arming over four feet to a trap works fine.

You can go up to five feet with a 2" trap arm.
Of course you will be able to reuse the exisiting vent that way. That little pipe through the roof that keeps things working right.

[Hardman]

does the height of the sanitary t make a difference/ I will have to pass over the water lines that are about a foot above the floor plate in the wall. tell me how and I will attach a picture

[Terry]

Having the santee above the 12" high water lines should be fine.

[Hardman]

Thanks for the help!