Plumbing pedestal sink under floor

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llt01

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I am ready to install a pedestal sink in my dpwnstairs bathroom. It seems to be easier if I were to plumb the main drain down through the floor and then install the p-trap and additional piping to the main line (unlimited access). Is this legal or should I try to pipe the p-trap above the floor?
 
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llt01

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Please correct me if i'm wrong. Doesn't a P-trap come down vertical from the drain then form a 180 deg loop up then elbow 90 deg to a horizontal run? This is what I would like to do, if I can. Is there a specific measurement the P-trap needs to be from the sink's drain?
 
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Plumber1

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No it would then go through the floor and be re-plumbed to a different place.
Yes it goes horizontal then.......
 

Prashster

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I don't think you should do what you're proposing. I understand from your original post that you want to install a standard p trap - you just want that trap to be below the floor, instead of a few inches under the sink.
Codes dictate that the trap be located no greater than a certain distance (I think it's 24").

I haven't found a technical reason for this, but I *believe* it has to do with the fact that water falling from a greater height might push the water out of the trap.
 

llt01

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Please See Attached File
 

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  • PLUMBING2.bmp
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Casman

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I believe prashter is correct there is a max length to the vertical drop and I think its to prevent water due to its drop from being pulled out of the trap.
 

hj

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trap

you cannot do it with the trap under the floor. Even if you could you would still need a vent. Installing the "P" trap above the floor, the way you describe would create an "S" trap out of the "P" trap. You could create a serious drainage, and odor, problem if the pipe from the drain to the trap were that long.
 
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