Laundry Room Standpipe - trap required?

Discussion in 'Canadian Plumbing Code Questions' started by shawn122, May 6, 2011.

  1. shawn122

    shawn122 New Member

    May 5, 2011
    Whitby, Ontario (Great Toronto Area)
    Hello everyone,
    I am in the process of redoing the layout of my laundry room (home is about 17 years old in whitby ontario) and was looking at the the existing plumbing for the washing machine.

    My question relates to the p-trap. Does the standing pipe require a p-trap?
    The laundry sink is nowhere near the washing machine so it does not feed directly into that line but it comes straight down into the basements, connects to an elbow joint proceeded with a long straight run that feeds into the stack via a y-attachment.

    With my investigations I don't think I saw any trap coming into the basement however i didn't look inside the walls.

    I can post photos if anyone thinks they will help.

  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    If it did not have a trap, there would be NOTHING to prevent the sewer gas from coming back up the standpipe.
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  4. shawn122

    shawn122 New Member

    May 5, 2011
    Whitby, Ontario (Great Toronto Area)
    That's what I figured :)
  5. Jerome2877

    Jerome2877 In the Trades

    Aug 25, 2009
    Vancouver Island , BC
    The trap is usually in the wall, it joins into a stack then drains down from there. It would need to be vented as well.
  6. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Rule of thumb is in the civilized world, every drain must have a trap and be vented. Your toilets have a build in trap, everything else has to have one added.
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