(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: Drain size for washer in Canada

  1. #1
    DIY Junior Member MIKE007's Avatar
    Join Date
    Aug 2013
    Location
    Montreal
    Posts
    14

    Default Drain size for washer in Canada

    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. #2
    DIY Senior Member dj2's Avatar
    Join Date
    Aug 2013
    Location
    California
    Posts
    315

    Default

    You need 2". Why is your drain 1-1/2"?

  3. #3

    Default

    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

  4. #4
    DIY Junior Member MIKE007's Avatar
    Join Date
    Aug 2013
    Location
    Montreal
    Posts
    14

    Default

    Thank you for your answer.

  5. #5
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
    Posts
    7,246

    Default

    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.

  6. #6
    30years plumbing 10years plumbing inspector Bill Shack's Avatar
    Join Date
    Mar 2014
    Location
    montreal quebec Canada
    Posts
    22

    Default

    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.

  7. #7

    Default

    the Ontario Plumbing Code is also changing the minimum drain size for a laundry pipe to 2"

Similar Threads

  1. pipe size /max length of run for kitchen, Canada Code
    By Philbert in forum Canadian Plumbing Code Questions
    Replies: 10
    Last Post: 06-29-2013, 07:47 AM
  2. floor drain, Canada
    By christoff in forum Canadian Plumbing Code Questions
    Replies: 6
    Last Post: 06-20-2010, 04:48 AM
  3. floor drain, Canada
    By christoff in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 6
    Last Post: 06-20-2010, 04:48 AM
  4. Clothes Washer drain size
    By DavidTu in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 6
    Last Post: 05-16-2010, 11:47 AM
  5. Disparity in replacement washer drain hose size
    By Timneh in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 10-30-2009, 06:41 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •