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    volksfolk74's Avatar
    volksfolk74 Posts: 3, Reputation: 1
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    #1

    Dec 8, 2004, 12:32 PM
    Drain to vent pipe
    Hi I want to add a small sink next to my toilet, it is a cement slab floor, can I drain the sink into the vent stack of the toilet. A trap will be used for the sink. I really want to stay away from busting up the floor.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #2

    Dec 8, 2004, 01:56 PM
    Drain to vent pipe
    You may discharge into the toilet vent providing there is nothing tied in over it and you keep within code for distance. With a 1 1/2" drain pipe it's 3 1/2' from trap to vent. With a 2" drain pipe it's 5'. Cut a drainage tee into the stack at 17 3/4" from floor to the center of the tees branch. Make your lavatory stubout 18" to center from the floor. Use DWV drainage fittings throughout. Good luck, Tom
    volksfolk74's Avatar
    volksfolk74 Posts: 3, Reputation: 1
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    #3

    Dec 8, 2004, 03:51 PM
    Thanks for the info... that would be less than 3.5' for the 1.5" pipe, right?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #4

    Dec 8, 2004, 03:56 PM
    That would be less than 3.5' for the 1.5" pipe, right?

    Right!
    volksfolk74's Avatar
    volksfolk74 Posts: 3, Reputation: 1
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    #5

    Dec 8, 2004, 04:11 PM
    Great! One more question... is there a "formula" to determine the degree of slope in the drain?
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #6

    Dec 8, 2004, 05:09 PM
    I think it is about 3%. If you notice, a DVW tee isn't a full 90. The branch is meant to slope up slightly with the run verticle. That is the angle you want.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #7

    Dec 8, 2004, 11:43 PM
    Slope
    For your job the norm is 1/4" fall to the foot. A 5' run would give you 1 1/4" of fall. Tom
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