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  • washing machine standpipe and drain ?

    I did a search and am a bit more confused than before I read all the responses. I have an 1.5" standpipe that passes thru the floor into a p-trap into a 2" waste line. The washing machine has drained fine for 20 years- never overflowed. We are selling the house and the inspector says it must be a 2" pipe and the p-trap is not current code. Does anyone know the best way to "adjust" this situation to keep the new buyers happy? I can change the standpipe to 2" easy enough, but should the trap be above the floor or can it be below, in the crawlspace? What kind of trap is currently required? I am in California. Thanks.

  • #2
    Re: washing machine standpipe and drain ?

    let me just mention that if there is an easy way to correctly change to a 2" sp with the correct trap, I will do it to keep the new owners happy. I am certainly not required to provide code upgrades to sell the house.

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    • #3
      Re: washing machine standpipe and drain ?

      The trap must be below the VENT! where is the vent or vented line?

      sounds like the easy way is to keep the trap in the crawl, and make sure every thing is done in 2"

      no 1-1/5"!!
      Last edited by jhplumbing; 10-23-2009, 09:05 PM.

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      • #4
        Re: washing machine standpipe and drain ?

        vented line is just below the floor, vent is about 3 feet downline from where the current standpipe ties in. It is at the end of the line.

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        • #5
          Re: washing machine standpipe and drain ?

          From the California Plumbing Code (UPC)


          804.1
          All plumbing fixtures or other receptors
          receiving the discharge of indirect waste pipes shall be
          approved for the use proposed and shall be of such
          shape and capacity as to prevent splashing or flooding
          and shall be located where they are readily accessible
          for inspection and cleaning. No standpipe receptor for
          any clothes washer shall extend more than thirty (30)
          inches (762 mm), nor less than eighteen (18) inches
          (457 mm) above its trap. No trap for any clothes
          washer standpipe receptor shall be installed below the
          floor, but shall be roughed in not less than six (6)
          inches (152 mm) and not more than eighteen (18)
          inches (457 mm) above the floor. No indirect waste
          receptor shall be installed in any toilet room, closet,
          cupboard, or storeroom, nor in any other portion of a
          building not in general use by the occupants thereof;
          except standpipes for clothes washers may be
          installed in toilet and bathroom areas when the
          clothes washer is installed in the same room.



          The trap must be above the floor, the vent must be above the sanitary fitting.


          Mark
          Attached Files
          Last edited by ToUtahNow; 10-23-2009, 09:38 PM.
          "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

          I never lost a cent on the jobs I didn't get!

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          • #6
            Re: washing machine standpipe and drain ?

            Thanks TUN. Using your picture, is it okay if the vent is located 3 feet downline from the trap, coming from the drainline under the floor and passing thru the roof? Thanks again.

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            • #7
              Re: washing machine standpipe and drain ?

              Originally posted by dumper753 View Post
              Thanks TUN. Using your picture, is it okay if the vent is located 3 feet downline from the trap, coming from the drainline under the floor and passing thru the roof? Thanks again.
              No the vent has to be located as shown although the vent is not shown going through the roof it does.

              Mark
              "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

              I never lost a cent on the jobs I didn't get!

              Comment


              • #8
                Re: washing machine standpipe and drain ?

                Hi.......
                I'm replacing my old style washing machine drain hose (now hanging over the utility sink) with a Standpipe drain system. I understand that the building codes require me to use a 2" pipe and 2" solvent P-trap. The only problem is that my drain line is 1 1/2". So is it safe to go from 2" pipe to 2" P-trap to 1 1/2 drain line
                Thanks
                GreatForum

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                • #9
                  Re: washing machine standpipe and drain ?

                  you can do what ever you want.

                  We will passed code.........NO

                  we it work.........maybe??

                  would i try it..........No

                  you need to get back to a 2" line and do it all 2". The washer dumps out alot of soapy suddy water FAST. You would be "choking" the line down by having 1-1/2". It very well could and probley will overflow.

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                  • #10
                    Re: washing machine standpipe and drain ?

                    I remember when 1 1/2 pipe was code for a laundry stand pipe then it became 2 inch quite some time ago. now here they require 3 inch at the base. the trap has always had to be above the floor with a vent above.
                    Home inspections are a tricky thing most inspectors in are area go off what the plumbing code was at the time the home was built in which they would be OK but some inspectors will try to inspect to current codes in which most older homes will fail
                    Guess the choice is yours to make to the change or not but it could affect the sale of your house to the potential buyer.

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                    • #11
                      Re: washing machine standpipe and drain ?

                      Can anyone say whether adding a 2" or 3" standpipe/trap to an existing 1-1/2" drain line would be any better than our present 1-1/2" standpipes/traps setups at handling the gush of water coming out of todays washing machines? Keeping in mind that using the lowest sudsing detergent available can help quite a bit in itself. Thanks.

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