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I have an unfinished basement that has rough-ins for plumbing. I would like to finish it some day, and I'm trying to envision what a bathroom would look like.

What purpose are the pipes for? Toilet? Tub/Shower? Sink? Wetbar?

basement pipes

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The small one in the top left coming out of the floor is likely for a shower or tub. The larger diameter pipe coming out of the floor is almost certainly for a toilet. The smaller pipe to the right of the toilet that continues up is for the lavatory (i.e. sink).

You can tell these things because:

  1. The toilet requires a 3" rough-in.
  2. Showers and tubs require rough-ins within the floor and the rough-in must contain a P-trap. So you can confirm that pipe in the top left is for a shower or tub by taking off the cap and pouring some water in it. If it "fills up" some before draining, you'll know it has a P-trap and is indeed for a shower or tub.
  3. The sanitary tee in the pipe that continues up is placed approximately correctly for a vanity sink.
  • Works for me the stubs look a bit tall but better tall than two short. – Ed Beal Aug 3 '18 at 23:34
  • I don't think it merits a dedicated question -- but is there a standard way to pop that cap off, to test if there's a trap? I don't want to cut the PVC yet :) – jglouie Aug 6 '18 at 16:13

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