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  • New Sink Drain and Vent

    I am remodelling my second-floor bathroom and want to add a second sink. The existing sink has a 1.5" drain and vent. The vent goes directly up through the roof and the drain drops down into the floor space and then runs horizontally for a while before going through the next wall. I'm assuming it ties directly into the main waste stack.

    So, I am wondering what the options are for draining and venting the new sink. Here's what I'm thinking...

    New Drain: If I'm interpreting the Uniform Plumbing Code correctly, a 1.5" horizontal drain can supply 1 dfu. Does this rule out connecting the new sink drain to the existing sink drain? The new sink drain will be about 45" from the existing. If I can't connect the new drain to the existing sink drain, can i run a new drain line for the new sink and tie it into a horizontal run of a 2" drain line from the shower? The UPC states a 2" horizontal drain can supply 8 dfu, so I would think that would be sufficient?

    New Vent: I am assuming that I can run a vent pipe for the new sink 6" or more above the rim of the sink rim and then tie it over to the existing vent pipe that runs up through the roof. The UPC states that a 1.5" vertical vent can supply 8 dfu which would be plenty sufficient.

    Other than simple under sink plumbing I don't have much experience so any advice is appreciated. I have done a good deal of research trying to figure out what is allowed, but I'd like to get some reassurance/corrections. Thanks in advance!

    -Brian

  • #2
    Re: New Sink Drain and Vent

    Originally posted by BrianJ View Post
    I am remodelling my second-floor bathroom and want to add a second sink. The existing sink has a 1.5" drain and vent. The vent goes directly up through the roof and the drain drops down into the floor space and then runs horizontally for a while before going through the next wall. I'm assuming it ties directly into the main waste stack.

    So, I am wondering what the options are for draining and venting the new sink. Here's what I'm thinking...

    New Drain: If I'm interpreting the Uniform Plumbing Code correctly, a 1.5" horizontal drain can supply 1 dfu. Does this rule out connecting the new sink drain to the existing sink drain? The new sink drain will be about 45" from the existing. If I can't connect the new drain to the existing sink drain, can i run a new drain line for the new sink and tie it into a horizontal run of a 2" drain line from the shower? The UPC states a 2" horizontal drain can supply 8 dfu, so I would think that would be sufficient?

    New Vent: I am assuming that I can run a vent pipe for the new sink 6" or more above the rim of the sink rim and then tie it over to the existing vent pipe that runs up through the roof. The UPC states that a 1.5" vertical vent can supply 8 dfu which would be plenty sufficient.

    Other than simple under sink plumbing I don't have much experience so any advice is appreciated. I have done a good deal of research trying to figure out what is allowed, but I'd like to get some reassurance/corrections. Thanks in advance!

    -Brian
    You need to tie into your 2" drain at the shower (or elsewhere) depending on the current dfu loading, your vent should be fine as you have described it.

    Mark
    "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

    I never lost a cent on the jobs I didn't get!

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