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Old 07-16-2016, 08:43 PM   #1
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Can there be too many bends in a drain line.


On my half bath upgrade, I'm replacing the old built-in vanity with a modern one with drawers, which are predominately on the right side of vanities. As luck would have it, my drain line comes in from the right side wall, (the supply lines come in from the back, as they should). The drain line is 5" off the back wall and 13.5" above the floor. Straight run of copper from wall. Haven't picked out a vanity yet, but might have to add a jog in the drain line (up and back) to clear a drawer. I can't imagine that a slight jog in the drain line between the P-trap and wall would be an issue, but thought I'd ask anyway?

(I won't be putting the line behind the wall due to corner stud.)
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Old 07-16-2016, 09:23 PM   #2
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Re: Can there be too many bends in a drain line.


You can make a horizontal offset, but not a vertical offset. That would create an s-trap.
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Old 07-16-2016, 09:25 PM   #3
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Re: Can there be too many bends in a drain line.


Any uphill drain can cause a vacuum lock, and never flow.

Might think about opening the wall and routing lower, then close the wall back up.


ED
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Old 07-16-2016, 09:35 PM   #4
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Re: Can there be too many bends in a drain line.


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Originally Posted by TheEplumber View Post
You can make a horizontal offset, but not a vertical offset. That would create an s-trap.
Oh interesting. Never heard of that. I was thinking of using two 45s if I need to offset vertically. Would that create an S-trap too.
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Old 07-16-2016, 09:36 PM   #5
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Re: Can there be too many bends in a drain line.


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Originally Posted by de-nagorg View Post
Any uphill drain can cause a vacuum lock, and never flow.

Might think about opening the wall and routing lower, then close the wall back up.


ED
there's no uphill drain. you misunderstand.
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Old 07-16-2016, 09:42 PM   #6
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Re: Can there be too many bends in a drain line.


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Originally Posted by LarryJ-nova View Post
there's no uphill drain. you misunderstand.
You said "add a jog in the drain line (up and back) to clear a drawer".

Sounds like uphill to me.


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Old 07-16-2016, 09:50 PM   #7
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Re: Can there be too many bends in a drain line.


Quote:
Originally Posted by de-nagorg View Post
You said "add a jog in the drain line (up and back) to clear a drawer".

Sounds like uphill to me.


ED
ok, up coming from the wall side. also said the drain if 13.5" off the floor.
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Old 07-16-2016, 10:01 PM   #8
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Re: Can there be too many bends in a drain line.


Larry J. : I still don't fathom the meaning.

So I capitulate.


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Old 07-16-2016, 10:38 PM   #9
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Re: Can there be too many bends in a drain line.


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Originally Posted by LarryJ-nova View Post
Oh interesting. Never heard of that. I was thinking of using two 45s if I need to offset vertically. Would that create an S-trap too.
Yes it would- no vertical offset in the trap arm. You stand a good chance of siphoning your trap that way.
I suggest extending the tailpiece length at the sink by using a SJ tailpeice extension and maintain the 1/4" grade to the wall.
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Old 07-17-2016, 08:47 AM   #10
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Re: Can there be too many bends in a drain line.


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Originally Posted by TheEplumber View Post
Yes it would- no vertical offset in the trap arm. You stand a good chance of siphoning your trap that way.
I suggest extending the tailpiece length at the sink by using a SJ tailpeice extension and maintain the 1/4" grade to the wall.
Good stuff. OK, I won't offset the horizontal trap arm. I will only offset it horizontally towards the wall if I need to work it around a vanity drawer between the wall and sink.

I don't understand your suggestion to extend the vertical tailpiece to work around a drawer. The drawer won't be under the sink, it will be to the right of the sink and will clear the vertical drain.

Mine.

Untitled by Larry Johnson, on Flickr

Sample vanity

http://www.homedepot.com/p/Glacier-B...M-WH/204728996
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Old 07-17-2016, 09:49 AM   #11
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Re: Can there be too many bends in a drain line.


I wasn't considering the drawer in my comment- simply saying that you will need a tailpiece extension to connect the sink drain to the trap when the trap arm is at 13".
You could open the wall and raise the tee where it connects with the vent- assuming the drain turns vertical there....

Your system appears to be copper so that's a bit more challenging to modify....
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Old 07-17-2016, 12:32 PM   #12
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Re: Can there be too many bends in a drain line.


OK, understood.
I initially tried to remove the copper pipe, but it wouldn't budge and I wasn't going to force the issue considering the cast iron connection. I bought a vanity this morning and it looks like the trap arm might fit behind one of the drawers if I move the arm closer to the wall. If not, I'll modify the drawer. Custom shelves beside the vanity will hide the trap arm outside the vanity. Tiny spaces are the worst. Thanks for all your help. I like it when I learn something new.
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