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Thread: P-Trap/Vent question for new washing machine

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    Default P-Trap/Vent question for new washing machine

    I have a contractor moving the plumbing from one wall to another in our laundry room so we can build a laundry closet for our new stackable washer/dryer. When I inspected the plumbing I noticed some things I hadn't ever seen before and wanted to make sure they would work. First of all, the drain (which will serve both the washer (standpipe) and a sink next to it) contains a p-trap below floor level a few feet from the standpipe - This will be the only ptrap for the washer standpipe and will also serve as the ptrap for the sink (altough the sink may have another trap under the cabinent). I've never seen a p-trap this far from a fixture before - is this OK? My other question is in regards to the vent - a vent was installed after the before mentioned p-trap (as a vertical branch off the drain by the sink). I've never heard of a vent being installed after a p-trap. Is this work ok? There is another vent for the bathroom 7 feet away so do I even need a vent here? Thanks, Trevor

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default drain

    Are you sure you have a plumber and not a handyman? We cannot see what you are describing, of course, but if we are reading it correctly the trap should not be more than 24" below the top of the riser pipe and the layout should be "P" trap, vent, and then drain. although where the "P" trap connects could have the drain going down and the vent rising from that point. The sink drain should connect to the vertical drain/vent pipe above the washer trap, but no to the riser where the washer hose will connect.

  3. #3

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    This is the type of work I see when licensed electrical contractors do plumbing...

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    Master Plumber master plumber mark's Avatar
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    Talking that looks rough

    is he tieing in some sort of lavatory off that elbow going up the wall
    or is that the vent???

    whatever it is meant to be ,
    if he puts a p trap on it it will certanly gurgle.
    .when the laundry lets out.


    maybe he is just putting in one trap to catch
    whatever is up the line from it...

    cleaning out that line in the future
    might be a tad hard to do too through that extra long trap.
    --------------------------------------------------------------------------

    he should have come up between the two fixtures and installed a cross tee or wye then installed a separate trap for the laundry and an arm out for the
    other fixture.... then ran the vent up and back over
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    I guess in theory what is there will work, I have seen worse,



    but I wouldent claim it as mine either
    Last edited by master plumber mark; 06-05-2005 at 01:40 PM.

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    Forum Admin, Expert Plumber Terry's Avatar
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    The correct way to have a laundry tray and washer plumbing.

    It should look closer to this.
    Notice the p-trap for the washer.
    The pipe for the laundry tray facing out will get a p-trap after the wallboard is up.
    Last edited by Terry; 06-08-2005 at 08:22 AM.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default pipes

    I suppose there is something correct about the installation, but beats me what it could be. No inspector would ever approve it and there may be a vent on the trap somewhere, but the picture does not show it.

  7. #7

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    Depending on what code you are trying to follow, you need something for water hammer. Look at Terry's pic again on the washer hookup...

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