P-trap - have to be downward?


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Old 02-12-23, 07:39 PM
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P-trap - have to be downward?

I'm remodeling a bathroom and bought a floating vanity. Long story short, the drain pipe coming out of the wall is too low. I can open the wall and add the 3-4" I need. My brother suggested I turn the J coming out of the wall 90 degrees and then add another piece so the actual p-trap was in the usual direction. Is this workable and to code?

If I'm not being clear, the J pipe attaching to the pipe coming out of the wall would be parallel to the ground and then have an additional pipe that connects to the actual trap.

 
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Old 02-12-23, 08:03 PM
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I wouldn't kludge it. Traps depend on venting to work, and only the bottom trap would be vented. It may work, it may not, but at best it's a kludge. Either open the wall and move the trap adapter (sheetrock is easy to fix) or use a long tailpiece from the sink Or an extension tailpiece. The tailpiece can be up to 24 inches long total.
 
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Old 02-13-23, 05:18 AM
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So wouldn't you just install the trap below the sink like normal and plumb the outlet of the trap down to the drain attachment?
 
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Old 02-13-23, 05:27 AM
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The bottom of the trap is at the bottom floor of the vanity forcing the vanity height to be too low. I cannot raise the vanity without modifying the plumbing or cutting a whole in the floor of the vanity. The latter is not really possible because there is a drawer.

I'm just going to raise the plumbing. It should be a <30 minute job. It's not a big deal, but my pvc cleaner and glue are probably dried out as I haven't used them for a long time and so I need to figure out what I need and hopefully get it in one trip to the store.

 
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Old 02-13-23, 07:10 AM
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Next question. I need the drain pipe coming out of the wall 6 inches higher. Where do I remove piping to do that? Do I have to go all the way back to the 4" trunk and cut in there or is there an easier way?


 
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Old 02-13-23, 10:45 AM
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Unfortunately the only correct way to move that pipe up is to move it up where it joins to the vertical drain/vent.

By using any type of vertical adjustment (in or out of the wall), you're violating plumbing code by dropping the drain before the vent.

It wouldn't be too big an issue to cut the 1.5" vertical PVC and put it back together using either a no-hub coupling or PVC repair coupling. But the copper supply pipes there do make it more complicated. You might have to raise the supply pipes too.

But I don't see any other code-compliant way to make the change.
 
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Old 02-14-23, 10:16 AM
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Thanks. Will it work using the existing hub would that cause water to siphon out of the trap? The copper in the way is really the issue. I'd rather not fool with that. If I make the change and move the hub up it would it be to code due to the height coming out of the wall?
 

Last edited by michaeljc70; 02-14-23 at 10:32 AM.
 

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