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Old 01-01-2013, 07:43 PM   #1
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Can I change the "orientation" of my p-trap?


Since I can't do any more framing until my tub arrives I figured I would get a head start on sorting out some of the plumbing. Can I change the orientation of my p-trap? This is for my basement bathroom build, concrete slab with a Barricade subfloor system. The bathroom is already roughed in and moving things around is not an option.

The current bathtub/shower drain is about a foot below the concrete, so I'll have to 90 off of that, to a straight vertical run to another 90 to my p-trap. In order for me to be able to fit the p-trap in the access area, I have to change the orientation of it as pictured below. Would there be any adverse effects of doing this or should I be ok?

This is my first bathroom so I apologize if the question is greener than grass.

Typical p-trap orientation



What I need to configure it as in order to fit

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Old 01-01-2013, 07:49 PM   #2
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Can I change the "orientation" of my p-trap?


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The current bathtub/shower drain is about a foot below the concrete, so I'll have to 90 off of that, to a straight vertical run to another 90 to my p-trap.

What you are describing here is not legal.

Is there a p-trap currently installed below the floor?

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Old 01-01-2013, 07:49 PM   #3
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Can I change the "orientation" of my p-trap?


no [problem whatsoever if you want to rotate the piece as pictured
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Old 01-01-2013, 08:04 PM   #4
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Can I change the "orientation" of my p-trap?


Unless the p-trap is hidden in the slab, I don't think there is one. Here is a pic of the area in question. If 90ing off of it and coming straight up then connecting to the p-trap is not legal, then I guess I could always dig down deeper to fit the trap to the current drain pipe that is exposed. It's already about a foot down so I'd just have to dig out a few more inches of dirt.


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Old 01-01-2013, 08:10 PM   #5
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Can I change the "orientation" of my p-trap?


Yep, that p-trap glues right onto that pipe you have there : "Trap Arm" Digging it down is the right way to do it.


The p-trap is designed to swing to give some flexibility in connecting the trap arm to the tailpiece. You can swing it completely back onto itself if you need to, but offsetting the trap arm vertically is a no-no.
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Old 01-01-2013, 08:40 PM   #6
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Can I change the "orientation" of my p-trap?


Thanks for the info, I really appreciate it. Should I just fill the space in with dirt once I have the trap installed?

Another question about the trap now that we have the orientation sorted out, should I use a trap that has a union on it, or just a solvent welded trap? I'm going to put an access panel on the outside wall to be able to access something in case of emergency, but seeing as though it will be backfilled with dirt, will it matter if I go solid or union?

Also, does it matter if I use a 1.5" trap or a 2"?

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Old 01-01-2013, 08:52 PM   #7
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Can I change the "orientation" of my p-trap?


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Thanks for the info, I really appreciate it. Should I just fill the space in with dirt once I have the trap installed?
Backfill with dirt or gravel is what our contractors usually do, some people prefer to cap it with a bit of concrete

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Another question about the trap now that we have the orientation sorted out, should I use a trap that has a union on it, or just a solvent welded trap? I'm going to put an access panel on the outside wall to be able to access something in case of emergency, but seeing as though it will be backfilled with dirt, will it matter if I go solid or union?
If it's in the dirt, access is going to be severely limited, so you use a solvent trap. No need for a union on it. We never use those.

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Also, does it matter if I use a 1.5" trap or a 2"?
To clarify, are you installing a tub, a shower or a tub/shower combo?

A shower requires a 2" drain. If you are putting in a shower and you only have 1.5" you will not be happy with the way it drains. If you're putting in a tub or a tub/shower, 1.5" piping is fine, BUT : The trap should be the same size as the trap arm. So you put a 2" trap on a 2" trap arm, put a bushing in the inlet, and connect your tub or tub/shower to that. Or if your trap arm is 1.5" then you put a 1.5" trap on it and continue as normal.

But again, a shower needs a 2" drain. The shower drain fittings come 2" standard.
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Old 01-01-2013, 09:09 PM   #8
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Can I change the "orientation" of my p-trap?


Ill be installing a tub in an alcove then tiling the surrounds and adding a shower head, so I guess a tub/shower combo. The drain line in the picture is a 2" so I'll just use the 2" trap. I picked up one of those bushings that reduces to 1.5" because I noticed that all of the tub drain kits at the store were 1.5".
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Old 01-01-2013, 09:15 PM   #9
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Can I change the "orientation" of my p-trap?


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Ill be installing a tub in an alcove then tiling the surrounds and adding a shower head, so I guess a tub/shower combo. The drain line in the picture is a 2" so I'll just use the 2" trap. I picked up one of those bushings that reduces to 1.5" because I noticed that all of the tub drain kits at the store were 1.5".
That's exactly right then.

Good luck!

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