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Thread: Branch drain sizing

  1. #1
    DIY Junior Member Aaa123's Avatar
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    Default Branch drain sizing

    Hello,

    Would you please answer the following:

    1) The '06 IPC, if I interpret table 110.1 and 110.2 correctly, states: a lav is worth 1 unit, a kitchen sink w/disposer and dishwasher is worth 2, and a clothes washer is worth 2. All combined, that's 5, and a 2" branch line can handle up to 6 units. Do I understand this correctly and Are these numbers the same for the '09 IPC?

    2) The iron I'm replacing has no clean-out and there is no practical place that I can put it. (In fact, local plumbers are frequently seen stuffing cable down vents.) Can I extend my branch beyond the fixtures and install a horizontal, overhead clean-out? I didn't notice anything in the '06 that would prevent it.

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    If the line is over 18" and not serving a fixture it is considered a dead end which is not allowed.

    John

  3. #3
    DIY Junior Member Aaa123's Avatar
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    Hi John and thanks!

    When you say 18", does that refer to the full length of the branch or the distance between the nearest fixture junction and the (proposed) clean-out?
    Last edited by Aaa123; 10-20-2011 at 06:54 PM.

  4. #4
    DIY Junior Member Aaa123's Avatar
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    Are these questions in the wrong forum? I am hoping to avoid a long trip to the main library.

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Quote Originally Posted by Aaa123 View Post
    Hi John and thanks!

    When you say 18", does that refer to the full length of the branch or the distance between the nearest fixture junction and the (proposed) clean-out?
    The distance between the nearest fixture junction.

    John

  6. #6
    DIY Junior Member Aaa123's Avatar
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    Thank you.

    I take your silence on the line size to be agreement?

  7. #7
    Plumber Winslow's Avatar
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    Fixtur unit values never change, with the exception of the water closet because of it's water usage being reduced considerably.

    Why can't you put the cleanout under the sink or on the washer?
    Last edited by Winslow; 02-04-2012 at 08:50 AM.

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