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his and herbathroom sink plumbing question

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his and herbathroom sink plumbing question

Old 06-06-2015, 07:34 PM
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Default his and herbathroom sink plumbing question

Are they plumbed together under the sink or are they two seperate sinks? Two sets of plumbing behind the wall.
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Old 06-06-2015, 08:10 PM
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We usually do two sets of drains. But it should work either way. With a double bowl kitchen sink , it is always plumbed together under the sink.
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Old 06-06-2015, 08:22 PM
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If one continuous countertop and and cabinet beneath, they'll both be plumbed into a Y fitting, which then goes into the wall after whatever elbows and p-trap you need.

One thing you can see from this, is they only used only 1 hot and 1 cold valve. Much cleaner if you use a sep. hot and cold for each fixture and put them high enough so you don't need to use unions like this person did to extend the supply lines in order to connect the water lines to each fixture. Also use 1/4 turn valves, not the ones pictured.

Not pretty but you get the idea.
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Old 06-06-2015, 09:49 PM
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What is the 'Y' looking fitting at the top of the stack?
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Old 06-06-2015, 09:52 PM
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Also, around here, that installation would be a problem. They want every fixture individually trapped so one can't back up into the other. We normally tie them together downstream of the traps and hit the stack. I guess it makes some sense but it seems like a little overkill for lavs.
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Old 06-07-2015, 02:15 AM
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Women and bathroom sinks - go separate. That way, when she clogs hers, she can use yours until you get around to getting the hair out. Otherwise, you have to rearrange your schedule....and plumb a straight shot from the drain to the trap - much easier to unclog.
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Old 06-07-2015, 02:22 AM
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Originally Posted by haneyrm View Post
What is the 'Y' looking fitting at the top of the stack?

Extra cost?
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Old 06-07-2015, 03:02 AM
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Separate
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Old 06-07-2015, 05:22 AM
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Most use a single feed and trap for each sink, connecting to a drain line feeding into the main drain.
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Old 06-07-2015, 05:30 AM
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While you guys are here - what about those metal flexible water supplies. I have used a few but my son had one give away and did $30,000 damage to his home. It was brand new and from Lowes. Probably made in China? Just total failure burst when he was away. Can't you use the plastic stuff or whatever that stuff is they use for heating now.
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Old 06-07-2015, 05:38 AM
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Originally Posted by haneyrm View Post
What is the 'Y' looking fitting at the top of the stack?
Looks like some kind of cleanout? Useless in that position....whatever it is!
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Old 06-07-2015, 05:51 AM
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Originally Posted by haneyrm View Post
What is the 'Y' looking fitting at the top of the stack?
My first thought is it is some kind of air vent. .
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Old 06-07-2015, 05:57 AM
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Originally Posted by Mine Now View Post
My first thought is it is some kind of air vent. .
Yes...same here. Could be air vents. The thing that threw me was 2 of them; clean outs or vents?
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Old 06-07-2015, 06:04 AM
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Originally Posted by Mine Now View Post
My first thought is it is some kind of air vent. .
After looking around that's some kind of Ikea set up and those plugged off things on top are for the overflows if the sinks have them.
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Old 06-07-2015, 06:17 AM
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this is a more common set up, unless the sinks are farther apart then they would be trapped separately and the y would be hidden in the wall
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Old 06-07-2015, 06:28 AM
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I found that if the waste stack is cast iron or heavy galvanized, putting a Y into it is not worth the trouble (or near impossible when I've seen it).

The waste lines I've seen run right against the wall too, with a T for a single drain and cutting it out and trying to add a Y is just way too much work.

New construction would be nice to keep it clean(er) but the older stuff can be tough.
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Old 06-07-2015, 02:51 PM
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Rusty Spoke - need to know why you asked the question in order to give you the best answer. If you're doing an insatall you can go either way. But If you're troubleshooting a problem, you need to know that the sinks could have cold water come off a common line or a separate one, and the same goes for the hot water line. If the runs are behind drywall, it's tough to figure out. Wife's cold water did not work in her sink for a long time, but the hot water was OK. She never told me and didn't remember when the problem started. Turns out it was after we had a leaky pipe. I re-routed the repair to to make it easier to solder where I had cut a hole in the ceiling in the pantry to access the leak. Turns out there was a run to her sink that I bypassed in the process. My sink was not affected. If she had mentioned the loss of the cold water to me at the time it would have been a lot easier for me to figure things out when it came to my attention a few years, and several more leaky pipe repairs later. Acidic water, now being addressed, and type M tubing contributed to multiple leaks, but that's another story.
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Old 06-07-2015, 02:57 PM
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Originally Posted by Esuomm1 View Post
After looking around that's some kind of Ikea set up and those plugged off things on top are for the overflows if the sinks have them.
I have never seen any residential sinks that close. That is asking for D-I-V-O-R-C-E.
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Old 06-07-2015, 04:42 PM
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Originally Posted by flcatcher1 View Post
Rusty Spoke - need to know why you asked the question in order to give you the best answer. If you're doing an insatall you can go either way. But If you're troubleshooting a problem, you need to know that the sinks could have cold water come off a common line or a separate one, and the same goes for the hot water line. If the runs are behind drywall, it's tough to figure out. Wife's cold water did not work in her sink for a long time, but the hot water was OK. She never told me and didn't remember when the problem started. Turns out it was after we had a leaky pipe. I re-routed the repair to to make it easier to solder where I had cut a hole in the ceiling in the pantry to access the leak. Turns out there was a run to her sink that I bypassed in the process. My sink was not affected. If she had mentioned the loss of the cold water to me at the time it would have been a lot easier for me to figure things out when it came to my attention a few years, and several more leaky pipe repairs later. Acidic water, now being addressed, and type M tubing contributed to multiple leaks, but that's another story.
Remodel.

Replacing a single sink with some sort of his and her sink. Wall is open, rerouting copper, etc. Havent decided whether 2 seperate sinks ore one large unit.

Thanks for the replies everyone!
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Old 06-07-2015, 06:16 PM
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Originally Posted by Mine Now View Post
this is a more common set up, unless the sinks are farther apart then they would be trapped separately and the y would be hidden in the wall
That on the the right is the perfect set up for doubles. Gotta love the new construction, major remodel jobs.
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