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Thread: Converting single bathroom sink to double sinks

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  1. #1
    DIY Junior Member maxxfusion's Avatar
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    Default Converting single bathroom sink to double sinks

    I am in the process of remodelling my bathroom. I have a 72" vanitiy with a single sink. I figured since I have the space double sinks would be really nice to have especially with kids. I made this decision late in my remodel project. I looked under the cabinet to check things out and found out that at one time there was double sinks there. So all the copper is in place. Here is my issue. I went to Lowes today and bought some ABS. I can not find the double fixture tee anywhere. I came home and googled the part. I came across the tee at Grainger but its 2 x 1 1/2 x 1 1/2 x 1 1/2. The abs pipe that runs upstairs is 1 1/2.

    So my question is does the double fixture tee i need exist in all 1 1/2? I am assuming i will have to order this online.

    Any help would be greatly appreciated.

  2. #2
    DIY Junior Member maxxfusion's Avatar
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    I just found a double sanitary tee in all 1 1/2. Not sure if I can use that?
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  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    The 1.5 double santee will be a bear to snake. It would need a cleanout on the vent to clear the center.

    There are also ways to run it using a wye and two santees that would force the snake downhill instead of over and across to the other lav location.

    If I had 1.5" pipe, I wouldn't even bother with a cross, but instead wye off and have opposing santees to to separate trap arms and then revent at 42"

    I know that are come countries that will do it, but they must not have ever done service work. I would love to watch them try to get the snake to drop down the vertical.


    Just found this picture
    Last edited by Terry; 03-26-2011 at 05:54 PM.

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    DIY Senior Member dlarrivee's Avatar
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    Default

    I searched this forum to find this picture from a thread created last year...

  5. #5
    DIY Junior Member maxxfusion's Avatar
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    My issue is i dont have the pipes exposed. I would need to rip out drywall to do this.

    Can i use this and some 45 degree elbows?


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    DIY Senior Member dlarrivee's Avatar
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    How would that be any better than the double santee.

    Look at what Terry posted, do you a see a double fitting of any type there?

  7. #7
    Forum Admin, Expert Plumber Terry's Avatar
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    No.
    That type of fitting would need to have vents on each arm. That fitting with a 45 creates an S trap.

  8. #8
    DIY Junior Member My Dream's Avatar
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    Default Going from single to double bath vanity question.

    Morning everyone, hope everyone is well.

    I've been racking my brain trying to figure out the proper way to extend the supply lines as well as drain/vent assembly, but would prefer some advice since this forum came highly recommended. I'm located close to Toronto Ontario, Canada and am a sheet metal worker by trade. I'm comfortable sweating pipes as well as working with abs.

    Details:

    Picture #1,2.3

    Vanity is 61" with an open back so I'd like to make all rough in close to the sink with shuts offs. Since there are drawer in the center that will make installation much more easy I'm hoping.

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    I have more pictures and details as well as how I believe it should be roughed in but I'm only allowed 4 images so if I'm allowed I can post more on another post.


    Thanks

    Frank
    Last edited by Terry; 05-04-2011 at 09:45 AM.

  9. #9
    DIY Junior Member My Dream's Avatar
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    Seems it's been merged so I'll carry on.


    Picture #4



    This is the present rough in and I've given rough dimensions where both sinks will be set. Builder didn't put any shut off so I improvised. Oh and I know I shouldn't have tiles so much but I got carried away.

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    Picture #5,6,7

    I'm going to renovate a second ensuite bathroom next so rather then open up the present bathroom I removed the main shower/tub wall in the opposite bathroom since it seemed the logical route. Therefore....this is what is inside the wall but only up to a 33" length.

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    Last edited by Terry; 05-04-2011 at 09:49 AM.

  10. #10
    DIY Junior Member My Dream's Avatar
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    Picture #8,9,

    Are above attic rough in, where the romex wire and the black plastic runs accross the joist is above the inside wall that has been opened up.

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    Picture #10,11

    I'm not pc savy so this was the only way I could do photo's.....sorry. Since I believe the original drain is vented via the main stack, I'd like to place another vent between drain #1 and #2 vertical into the attic and accross and "T" into the smaller abs. Are the highlighted marks visible?



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    Last edited by Terry; 05-04-2011 at 10:00 AM.

  11. #11
    DIY Junior Member My Dream's Avatar
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    Picture #12

    This is the frontal view. ABS drain would maintain standard 1/4" per foot slope.

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    Last edited by Terry; 05-04-2011 at 10:02 AM.

  12. #12
    Forum Admin, Expert Plumber Terry's Avatar
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    Right now you have an 1-1/2" drain line for one lav.
    I can't make out on the drawing which way you are intending to drain it.

    Normally you would use a fixture cross and drain out the bottom with 2"

    Last edited by Terry; 05-04-2011 at 10:16 AM.

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