Is there a maximum height from my shower drain to the top of the trap (the length of the tailpipe)?

I am aware after the trap there must be a 1/4" per ft slope and the vent must be within 60".

Question: Can I put my trap 24" below my shower drain?

  • Yes, my original question, however, is about how far underneath the shower drain can the P trap be, imagine a vertical pvc pip connecting the drain to the p trap, how tall can this section be?
    – Ishy Ar EX
    Jul 14, 2020 at 18:32

1 Answer 1


According to the International Residential Code, the maximum vertical distance between the sink drain and the entrance to the p-trap is 24 inches.


Be aware that it'll make a fair bit of noise dropping that far.

  • Note that not only will water make noise but I have been in showers where you just hear a general echo and that is with just 12" traps. I mean it isn't life changing but it is noticeable especially with a few people in a shower.
    – DMoore
    Jul 14, 2020 at 19:54
  • Thank you to the both of you!
    – Ishy Ar EX
    Jul 14, 2020 at 21:52
  • Despite the name containing "International", this code seems to be valid only in a very limited number of jurisdictions... Jul 15, 2020 at 11:51

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