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Old 09-20-2011, 09:24 PM   #1
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How to plumb this pedestal sink?


I am replacing a vanity with a pedestal sink, due to the small size of a bathroom(~5x5) not including the tub). The previous plumbing used an S Trap. There is a 4x8 beam directly under the wall behing the sink and toilet, so I don't want to drill though that.

The vent is a 4" cast iron pipe located in the corner of the room, that will be covered with wood and drywall when it is finished.

What are my options? Would an S Trap be grandfathered in, since that is what was there before?
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Old 09-20-2011, 11:04 PM   #2
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How to plumb this pedestal sink?


If the ceiling space under the sink is accessible, how about having the p-trap under the floor and bringing a straight piece of pipe up to connect to the sink drain?

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Old 09-21-2011, 06:56 AM   #3
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How to plumb this pedestal sink?


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If the ceiling space under the sink is accessible, how about having the p-trap under the floor and bringing a straight piece of pipe up to connect to the sink drain?
I thought about that, but figured it would violate some code... Can anyone confirm this?
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Old 09-21-2011, 09:13 AM   #4
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How to plumb this pedestal sink?


Is the wall demo'ed?

You can't have a p-trap under the floor for a sink here, the max distance for a tailpiece is 2 feet.

How about drilling the hole for your drain just at the edge of the wall in the subfloor, cut the bottom plate, and offset right into the wall immediately. The base of the pedestal should mostly hide the offset, and you could paint it if you wanted.
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Old 09-21-2011, 10:54 PM   #5
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How to plumb this pedestal sink?


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Is the wall demo'ed?

You can't have a p-trap under the floor for a sink here, the max distance for a tailpiece is 2 feet.

How about drilling the hole for your drain just at the edge of the wall in the subfloor, cut the bottom plate, and offset right into the wall immediately. The base of the pedestal should mostly hide the offset, and you could paint it if you wanted.
Yes the wall is demo'd. I think this is what I am going to do. Do I need to install a vent? The distance from the sink drain to the vent stack is 3'6" if that makes a difference. The drain pipe the sink drains into is 4" and so is the vent.
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Old 09-21-2011, 11:19 PM   #6
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How to plumb this pedestal sink?


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Yes the wall is demo'd. I think this is what I am going to do. Do I need to install a vent? The distance from the sink drain to the vent stack is 3'6" if that makes a difference. The drain pipe the sink drains into is 4" and so is the vent.
Yes it should have it's own vent. What's on the wall behind it? You could install an AAV if tying back into the stack is an issue, and aav is allowed by your local code.

Needs to be accessible at the very least. Around here we can put them in attics.
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Old 09-23-2011, 01:21 AM   #7
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How to plumb this pedestal sink?


Up here the code changed a few years ago, a fixture outlet pipe can be 42".

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