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Alberta plumbing code re: shower drain size.

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  • Alberta plumbing code re: shower drain size.

    Hi all. I am new to the forum. I know this question has been asked a thousand times on here but I guess it depends on where you are living.

    My question is this:

    I am renovating my bathroom and am taking out the tub and putting in a shower. Right now i have 1 1/2" drain line. Am I able to use the existing 1 1/2" drain or do I have to put in a 2" line.

    I am in Calgary Alberta Canada.

    Cheers Ed

  • #2
    Re: Alberta plumbing code re: shower drain size.

    I THINK I have found the answer????

    canadian code states:

    Canadian National Plumbing Code
    2.4.9.3
    shower drains
    minimum size of fixture outlet pipe in inches
    1 shower head - 1½"
    2 or 3 heads - 2"
    4 to 6 heads - 3"

    Is this correct????

    Comment


    • #3
      Re: Alberta plumbing code re: shower drain size.

      Originally posted by theclibinggod View Post
      I THINK I have found the answer????

      canadian code states:

      Canadian National Plumbing Code
      2.4.9.3
      shower drains
      minimum size of fixture outlet pipe in inches
      1 shower head - 1½"
      2 or 3 heads - 2"
      4 to 6 heads - 3"

      Is this correct????
      not sure about canada but down here in chicago min. for shower is 2"
      SMELLS LIKE $$$$$$ TO ME

      Comment


      • #4
        Re: Alberta plumbing code re: shower drain size.

        In Toronto, its 2" also.

        Comment


        • #5
          Re: Alberta plumbing code re: shower drain size.

          Must one change to 2" if merely replacing an existing bath tub?

          You don't want to leave the tub and add a shower to it?
          I'd take an educated guess - but I'm unqualified.
          It ain't just soot, it's paydirt.
          "I swear, wherever Gift goes, argument follows." -Youtube comment

          Comment


          • #6
            Re: Alberta plumbing code re: shower drain size.

            a 1.5" drain can handle 12 gallons per minute, a shower head delivers 2.5 gallons per minute so this will work in a tub.

            eliminate the tub add multiple shower heads/jets and you need to increase the drain size. it may seem okay to have four heads that total 10 gallons per minute (hey it's less than 12 gallon limit) but step on the drain or drop a wash cloth on it and it'll overflow very quickly.

            a 2" drain removes 20 gallons per minute.

            I've installed showers/body wash with 4-5 heads, 2" drain and no shower curb (1"slope)! without problems. More than 5 heads go to 3"drain".

            Comment


            • #7
              Re: Alberta plumbing code re: shower drain size.

              Here in Calif. the code is 2" drain for showers, but moble homes are 1-1/2" and work fine. Go figure.

              Comment


              • #8
                Re: Alberta plumbing code re: shower drain size.

                Originally posted by plumb4life View Post
                Here in Calif. the code is 2" drain for showers, but moble homes are 1-1/2" and work fine. Go figure.
                Every thing works fine in a MH until some one unfortunately has to try to work on them

                Comment


                • #9
                  Re: Alberta plumbing code re: shower drain size.

                  Originally posted by DELCASE View Post
                  Every thing works fine in a MH until some one unfortunately has to try to work on them
                  I dont know my double wide works fine oh were talking pipes
                  SMELLS LIKE $$$$$$ TO ME

                  Comment


                  • #10
                    Re: Alberta plumbing code re: shower drain size.

                    after a lenghty heated debate with a plumber and the local plumbing inspector and a practical test the post by theclibinggod is correct...

                    the plumber I hire claimed 1.5" was sufficient for a shower regardless the number of heads in the shower because it all comes though the same pipe/central control and the local inspector agreed, he said it was the number of control valves not heads...they were both wrong...
                    they didn't account for PSI... the rate water comes out the source is not the same as it is when it drains with gravity alone...

                    doing a practical test in my own multihead shower with a two inch drain it will handle four heads fully opened but not five, I however rarely use all five and never open the valves more than 50%...so I have no issues, but I'm an adult, a child or guest using the shower may not be as aware and crank all the valves open or stand on the drain then I'd have a serious problem...

                    I still don't agree with 1.5 for one head, it needs a 2"

                    2-3 heads 2" drain

                    more than 4-6 heads 3" drain

                    Comment

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