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Old 11-06-2011, 01:19 AM   #1
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Plumbing Double Vanity Drain


I'm working on a bathroom remodel project. The existing bathroom had a single vanity sink. I'm looking to convert it to a double vanity (60").

The following are two photos of the existing plumbing; the red circles indicate where the other sink will be located:




What I'd like to do is simply tie the two sinks together, similar to the approach that is done with a kitchen sink garbage disposal set up. Like this diagram:
http://www.askmehelpdesk.com/attachm...1&d=1246966590

The concern I have is that there is another bathroom on the other side of the wall. As you can probably see in the photos, there is already a sanitary T where the sink from the other bathroom ties in. This is a 1 1/2 drain and vent.

Is it problematic to add the double sink, draining into the one with this setup? I want to comply with code.


Last edited by LowlyDIYer; 11-06-2011 at 01:24 AM. Reason: additional details
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Old 11-16-2011, 08:23 AM   #2
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Plumbing Double Vanity Drain


Bump...anyone?

My other option is to essentially remove the cleanout (not sure why it's there) and put in a sanitary tee running through the wall over to the location of the second sink. Is that allowed?


Last edited by LowlyDIYer; 11-16-2011 at 08:30 AM.
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Old 11-16-2011, 09:09 AM   #3
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Plumbing Double Vanity Drain


depends on the distance from the two sinks, center to center. i believe if it is 30 inches or less you can do what you described, otherwise you need separate traps and drains that can tie into a single vent.
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Old 01-12-2012, 05:00 AM   #4
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Plumbing Double Vanity Drain


Found this picture for converting a single vanity to a double.
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Plumbing Double Vanity Drain-single_to_double_lav.jpg  
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Old 01-12-2012, 07:07 AM   #5
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Plumbing Double Vanity Drain


Quote:
Originally Posted by hammerlane View Post
Found this picture for converting a single vanity to a double.

That would be the correct way to pipe in that second sink... adding a sanitary tee to that stack would exceed the fixture load allowed on that line. Looks like 1 ?
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Old 01-12-2012, 08:17 AM   #6
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Plumbing Double Vanity Drain


fwiw.. I'll always suggest only ONE sink in a bathroom...
with that set as near to one end of the largest lavatory top as will fit in the room.
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Old 01-12-2012, 01:47 PM   #7
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Plumbing Double Vanity Drain


I went this route:



Distance of drain openings from center to center is 30"

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Old 01-12-2012, 02:08 PM   #8
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Plumbing Double Vanity Drain


Quote:
Originally Posted by LowlyDIYer View Post
I went this route:



Distance of drain openings from center to center is 30"
I would think this would be the route to go: 1 double sanitary T.

Is this acceptable whereas the previous pic with 2 single sanitary Ts overkill?

Also, what is the thing that looks like a cleanout 12" about the sanitary T for?

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Old 01-12-2012, 05:50 PM   #9
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Plumbing Double Vanity Drain


looks good but is it me or are the drains to high.....most rough ins...... drains 18-19"off finish floor to center of drain...21" for water lines...
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Old 01-12-2012, 09:25 PM   #10
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Whatever happened to the code? What code? Is there a code, whos code, I say the code boy just the code boy. Never mind ill mind my own code.
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Old 01-12-2012, 10:52 PM   #11
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Quote:
Also, what is the thing that looks like a cleanout 12" about the sanitary T for?
Good question...I asked myself the same thing. It was actually in that location originally - so I left it in place. Plumbing code makes reference to clean outs being needed in certain places but this one is on the vent so it makes me scratch my head. I actually think it's because of the double sanitary tee. Nonetheless, if it was there before...it stays.


ben's plumbing: they're actually a bit lower; the drains are 17" from the floor and the supply lines are 12" and 14".

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Old 01-12-2012, 10:54 PM   #12
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Whatever happened to the code? What code? Is there a code, who’s code, I say the code boy just the code boy. Never mind ill mind my own code.
What exactly do you think is not up to code?

There is no code mandate for height of drain or supply lines. There are rules of thumb and those certainly can be modified, especially to work with a given vanity.

UPC 704.2 says, "Two fixtures set back-to back, or side-by-side within distance allowed between a trap and its vent may be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet opening at the same level." So, that doesn't look to be an issue.

Also, doesn't exceed load for the drain or vent.

What else do you consider problematic?

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Old 01-13-2012, 09:02 AM   #13
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Plumbing Double Vanity Drain


Quote:
Originally Posted by LowlyDIYer View Post
What exactly do you think is not up to code?

There is no code mandate for height of drain or supply lines. There are rules of thumb and those certainly can be modified, especially to work with a given vanity.

UPC 704.2 says, "Two fixtures set back-to back, or side-by-side within distance allowed between a trap and its vent may be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet opening at the same level." So, that doesn't look to be an issue.

Also, doesn't exceed load for the drain or vent.

What else do you consider problematic?
Playing devils advocate, because I do not know the code, does this situation still comply with the code considering he actually has 3 fixtures on this drain ( I believe he said 1.5") the other coming from a sink in a bathroom adjacent to this one. It outlets to the drain at a higher level then the two other sinks, and may or may not exceed the fixture capacity of this drain line.

Just a question.
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Old 01-13-2012, 09:16 AM   #14
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Plumbing Double Vanity Drain


Quote:
Originally Posted by LowlyDIYer View Post
What exactly do you think is not up to code?

There is no code mandate for height of drain or supply lines. There are rules of thumb and those certainly can be modified, especially to work with a given vanity.

UPC 704.2 says, "Two fixtures set back-to back, or side-by-side within distance allowed between a trap and its vent may be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet opening at the same level." So, that doesn't look to be an issue.

Also, doesn't exceed load for the drain or vent.

What else do you consider problematic?
Yeah, you need 2" for that many fixtures, and they are not plumbed together properly. The two side by side are fine, but once you throw in the third one on the back side of the wall, it's failed inspection.
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Old 01-13-2012, 09:22 AM   #15
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Plumbing Double Vanity Drain


Quote:
Originally Posted by LowlyDIYer View Post
What exactly do you think is not up to code?

There is no code mandate for height of drain or supply lines. There are rules of thumb and those certainly can be modified, especially to work with a given vanity.

UPC 704.2 says, "Two fixtures set back-to back, or side-by-side within distance allowed between a trap and its vent may be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet opening at the same level." So, that doesn't look to be an issue.

Also, doesn't exceed load for the drain or vent.

What else do you consider problematic?
You appear to be under UPC code since you are quoting it, I'll quote some more:

UPC706.2 - "...Double sanitary tees may be used when the barrel of fitting is at least 2 pipe sizes bigger than the largest inlet"
Therefor your fitting should be a 2x1.5x1.5x1.5 dbl san tee.

UPC Table 7-5: Maximum fixture loading on a vetical 1.5" drainage pipe = 2(except sinks & urinals)
Maximum fixture loading on a horizontal 1.5" drainage pipe= 1

According to Table 7-3 a lav is valued at 1 DFU. How many lavs do you have on that 1.5 line?

In summery:
Your dbl sant is an approved fitting but not for your application
You have overloaded the 1.5" drain line.

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