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How far can the trap be from the washing machine? The trap now is about five feet from the waste line and the machine is next to it. I want to move the machine 10 feet from the trap, but don't want to relocate the trap. Is that OK?

  • Check the manufacturer's documentation for the washer, as it might have restrictions. Also check local plumbing codes for trap arm length. – Tester101 Dec 21 '15 at 19:23
  • For code, you would need a 4" pipe size for a maximum of 16' Are you looking for opinions on a non-code option? – Damon Dec 21 '15 at 19:26
  • Can you provide a photo? – Tester101 Dec 21 '15 at 19:36
  • Consider running the drain hose with a high point in the middle of the run between the machine and the trap, so that when the machine's pump stops you won't have an entire hose-full of water draining back into the machine. – Daniel Griscom Dec 22 '15 at 4:04
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Typically washers discharge into a standpipe, which extends 18"-42" above the trap weir. The plumbing can then continue on 5'-8' before there's a vent (5' for 1¼" pipe, 6' for 1½" pipe, 8' for 2" pipe).

References:

  • IRC Table P3105.1
  • IRC P2706.2

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