Drain size for washer in Canada

Discussion in 'Canadian Plumbing Code Questions' started by MIKE007, Aug 26, 2013.

  1. MIKE007

    MIKE007 New Member

    Joined:
    Aug 24, 2013
    Location:
    Montreal
    My vertical drain is 1 1/2. There is a dishwasher + kitchen sink on the first floor and a washing machine in the basement connected trough a back flow valve after the p-trap. I newer used both washing machines at the same time. Is this diameter fine for both machines at the same time or I need 2"?

    Thanks
     
  2. dj2

    dj2 Well-Known Member

    Joined:
    Aug 13, 2013
    Location:
    California
    You need 2". Why is your drain 1-1/2"?
     
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  4. mikeplummer

    mikeplummer Plumber

    Joined:
    Mar 28, 2012
    Location:
    Ontario, Canada
    maximum hydraulic load (fixture units) drained to a 1-1/2" soil or waste stack - 8FU
    maximum fixtures units from any one storey drained to a 1-1/2" soil or waste stack - 5FU

    kitchen sink = 1.5 FU
    dishwasher = if separately trapped with 1-1/2" trap - 1FU if connected to sink or garbage disposal - 0FU
    clothes washer = 1.5FU with 1-1/2" trap

    assuming all piping and venting is proper - your arrangement meets code requirements
     
  5. MIKE007

    MIKE007 New Member

    Joined:
    Aug 24, 2013
    Location:
    Montreal
    Thank you for your answer.
     
  6. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    I believe Canadian codes are different in that they have not upped the drain sizes as the US has. Your 1-1/2" may be legal, but 2" sure would be better.
     
  7. Bill Shack

    Bill Shack 30years plumbing 10years plumbing inspector

    Joined:
    Mar 10, 2014
    Occupation:
    retired
    Location:
    montreal quebec Canada
    I disagree, The pipe must be at least 2 inches, Further the Quebec amended canadian code is about to change so that all laundry machines connection are minimum 2 inches.
     
  8. mikeplummer

    mikeplummer Plumber

    Joined:
    Mar 28, 2012
    Location:
    Ontario, Canada
    the Ontario Plumbing Code is also changing the minimum drain size for a laundry pipe to 2"
     
  9. Toto

    Toto New Member

    Joined:
    Apr 3, 2015
    Location:
    Nova Scotia
    Does this plumbing code differentiate between the different types and sizes of washers? I am asking, because I am trying to get a plumber install a compact, 2.2 cu ft., 24'' wide, front load washer in the place of my dishwasher in my kitchen. And despite the fact that the washer's manual asks for a minimum of 1 1/4 '' drain pipe, all I get by the plumbers is that can not do the job because my drain pipes are 1 3/4'' whereas their codes requires dain pipes for washers to be 2''.

    I am not a professional plumber, but I think there is quite a difference between a 6 cu. ft . washer and a 2.2 cu. ft. washer. So do these plumber codes make a difference based on the size of the washers and the amounts of water they use in setting the drain pipe requirements?

    Actually, I would appreciate your opinion regarding my project. You can see the details in the add that I have posted in an effort to find a plumber do the job:
    http://www.kijiji.ca/v-plumber/city...er/1061687666?enableSearchNavigationFlag=true
     
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