Sharing a branch drain line. Kitchen sink and clothes washer?

Does code prohibit a kitchen sink and a front load clothes washer on the same 2" drain branch?

  • Yes

    Votes: 0 0.0%
  • No

    Votes: 1 100.0%

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Ken Harvey

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New kitchen sink 25' from clothes washer.
Existing clothes washer with 1 1/2" trap.

Can these two share the same 2" horizontal drain line? note there's an 8" drop from the sink line half way to the washer, so not continuously 1/4" per ft.

Will inspectors say the existing washer is not grand-fathered and therefore insist on at upgrade to 2"

Even with the upgrade, dfu's total 5, so less than the 2" pipe's 6 dfus. Was told by a pro that the sink needs a separate line all the way to the 3" stack, but I don't see that restriction in any code or online example.
Hey, wait a minute.

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