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Thread: DWV for new bathroom questions

  1. #1

    Default DWV for new bathroom questions

    I am building a brand new bathroom and had a questions regarding the DWV runs. As shown in the pic I have a double sink on one side of the bathroom and a whirlpool tub and seperate shower on the opposite side. I am woundering if I can run a 2" horizontal drain between both fixture and connect all the fixtures to it. The 2" line would then connect into a vertical 3" main drain.
    Note the shower would be plumbed with 2", the double sinks 1 1/2 and tie into 1 drain via a 4 way tee with a vertical line going up for the vent and a line going down to connect into the 2" line between all fixtures. The tub would be plumbed 1 1/2.

    Please refer to pic

    Or does the shower, whirlpool tub and sinks need to connect into the 3" main drain by means of their own run into a wye on the 3' line?
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  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default Dwv

    The way you have it drawn, nothing on the bottom section is correct, and you cannot use a "4 way tee" for the sink connection.

  3. #3

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    I think you miss understood the previous pic was not a upstairs and downstairs veiw. Let me try again.

    http://www.terrylove.com/forums/atta...1&d=1218029214

    this is like the top view for the double sinks
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  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default drawing

    I know which way the drawing shows. Rather than try to give a direction, I am saying everything "below" the horizontal line is incorrect, and it will still be after you install it in the ground or wherever it goes. AND you cannot use the "4 way" tee for the sinks either. There is a specific fitting for that purpose.

  5. #5

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    Quote Originally Posted by hj View Post
    I know which way the drawing shows. Rather than try to give a direction, I am saying everything "below" the horizontal line is incorrect, and it will still be after you install it in the ground or wherever it goes. AND you cannot use the "4 way" tee for the sinks either. There is a specific fitting for that purpose.
    What do you mean by "everything "below" the horizontal line is incorrect, and it will still be after you install it in the ground or wherever it goes"

    and for the sink what is this special fitting required

    thank you

    The double lav needs a 2.0"x1.5"x1.5x1.5 double fixture fitting.
    You can't combine two lavs into a 1.5 riser. It needs to be 2"
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    Last edited by Terry; 02-22-2009 at 12:02 PM.

  6. #6

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    Quote Originally Posted by dlink View Post
    What do you mean by "everything "below" the horizontal line is incorrect, and it will still be after you install it in the ground or wherever it goes"

    and for the sink what is this special fitting required

    thank you
    any comments on this this would be appreciated

  7. #7
    Plumbing Contractor C NUMB's Avatar
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    Default

    Excuse the freehand drawing, hope this helps




    I would keep the main waste line 3" but thats my opinion, 2" would work also, but you are getting close to the maximum allowed fixtures units on a 2" There is a saying down in my neck of the woods that you cannot dump a 2" over a 2" so thats why we run 3", and I know someone will chime in and say the tub and lavs are 1 1/2" but that is not how they look it at, just an fyi if you are ever down my way.
    I'd Rather Be FISHIN'

  8. #8
    Moderator & Master Plumber hj's Avatar
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    Default drains

    Now that you have a picture, in this area at least, the piping to the right, i.e., to the shower and tub would not pass without additional venting. The proper fitting is a "back to back fixture fitting", and it also needs/should have a cleanout tee in the vertical pipe beneath it. Plumbing codes are a "minimum requirement" and are not always the BEST installation although it may be an adequate one.

  9. #9

    Default

    in the atached pic the area's with read circles, since the 3" main and lines from each ficture are running horizontal do I use a or a say 3x3x2 sanitory tee?
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  10. #10

    Default

    first of all thank you for your help.

    and yes I understand that I need to vent the tub and shower seperatly. In my picture it showes the tub and where the shower will be and it shows the drain lines with p traps running from to let say the 3" horizontal drain as suggested. Where or how would I ven this 2 fixtures. I have a wall to the left of the shower and tub.

    thank you
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  11. #11
    Plumbing Contractor C NUMB's Avatar
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    Default

    Quote Originally Posted by dlink View Post
    in the atached pic the area's with read circles, since the 3" main and lines from each ficture are running horizontal do I use a or a say 3x3x2 sanitory tee?
    3"x2" combo (wye and 1/8 bend)

    The one vent is enough and it is how its done here in the southeast, but I know that a lot of places make you vent individually.
    Last edited by C NUMB; 02-22-2009 at 08:15 AM. Reason: added text
    I'd Rather Be FISHIN'

  12. #12

    Default

    again thank you for the help....

    and yes I understand that I need to vent the tub and shower seperatly. In my picture it showes the tub and where the shower will be and it shows the drain lines with p traps running from to let say the 3" horizontal drain as suggested. Where or how would I vent these 2 fixtures. I have a wall to the left of the shower and tub.

    thank you
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  13. #13

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    anyone have any suggestions on how to runn the drains for the shower and tub as shown in the pic in my prevoius post. I have drawn out the drain line runs.

    thanks

  14. #14
    Plumbing Contractor C NUMB's Avatar
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    Default

    Just got back from work, I'll give you another option if you need more venting.

    I'd Rather Be FISHIN'

  15. #15

    Default

    I appreciate your assistance. But yes I need the tub and shower to each have their own vent when they leave and of course they can connect together once in the attic.

    Also as I have shown in the of above, how do I vent each fixture when it comes to the tub and shower I understand that they cannot travel horizontal until they have ran at least 6" verticaly above the fixture which it is venting, I think that correct??
    Last edited by dlink; 02-22-2009 at 06:59 PM.

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