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Thread: Washing machine venting

  1. #1
    DIY Senior Member Rich B's Avatar
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    Default Washing machine venting

    I have two washing machine drains to plumb and vent. I am upgrading them to the proper size 2" using wyes into a short 4" horizontal C.I. section. I can go straight up with a vent. The two washer drains are seperated by a block wall in the basement, as this is a 2 family house. Can I use 1-1/2 for the vents, go straight up and join the two together in the common wall above? From there it would join with a common vent for one of the bathrooms upstairs. A tub and a sink....then up thru the roof and increased to 2"....The existing washer drains had no vents and are 1-1/2" and are poorly done in galvanized pipe.
    Last edited by Rich B; 04-25-2009 at 04:32 PM.

  2. #2
    DIY scratch-pad engineer leejosepho's Avatar
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    Default

    I believe what you have planned will work fine, but a real plumber will have more insight as to codes.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default vents

    One thing about the common wall between units, is that it may be considered a fire wall and, if so, any penetrations should be made and sealed with fire resistant materials.

  4. #4
    Plumbing Designer FloridaOrange's Avatar
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    Under my codes, once you connect the two vents together you'll need to be at 2" for the vents.

    What is your location or what codes are you under?
    A sketch or picture would likely help further.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  5. #5
    Master Plumber nhmaster's Avatar
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    Which code is that?

  6. #6
    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by nhmaster View Post
    Which code is that?
    Florida Plumbing Code 2007, based on IPC.
    Common, wet and/or waste stack 1-1/2" Vent is only good for 1 dfu.

    Also under FPC the min vent for 1 clothes washer is 2".
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  7. #7
    Master Plumber nhmaster's Avatar
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    Me thinks you have mis-interpreted the IPC. You can wet vent an entire bath group off an 1 1/2 pipe.

  8. #8
    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by nhmaster View Post
    Me thinks you have mis-interpreted the IPC. You can wet vent an entire bath group off an 1 1/2 pipe.
    I may have. I only have the FPC, the foreward in the FPC indicates its basis on IPC.
    FPC2007 Table 909.3
    Wet Vent/DFU=
    1-1/2"/1 dfu
    2"/4 dfu
    2-1/2"/6 dfu
    3"/12 dfu
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  9. #9
    DIY Member techinstructor's Avatar
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    Quote Originally Posted by FloridaOrange View Post
    I may have. I only have the FPC, the foreward in the FPC indicates its basis on IPC.
    FPC2007 Table 909.3
    Wet Vent/DFU=
    1-1/2"/1 dfu
    2"/4 dfu
    2-1/2"/6 dfu
    3"/12 dfu
    North Carolina code is similar to FL.
    Table: 908.3
    1/1/2"/1 dfu
    2"/4 dfu
    2 1/2" to 3"/6 dfu

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