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Thread: Bathroom reno piping question??

  1. #1
    DIY Junior Member jonny's Avatar
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    Default Bathroom reno piping question??

    Hi I am renovating my bathroom took out a single vanity sink and putting in a double vanity. I included a picture of sorts of what i plan on doing. I wasn't sure if i needed a revent on the 2nd sink since its only 30" center to center of the drain.Both arms coming off would be on the right side of the drain. I would have p-traps on both sinks. Does anybody know if this will work or if i would have to revent the 2nd sink. Thanks in advance /Users/emilybonilla/Desktop/Bathroom reno.jpg

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    Moderator & Master Plumber hj's Avatar
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    The link does not work because it refers to an item on YOUR computer, not the Internet. From your description, you have to vent BOTH sinks, not just the "second" one. Once you add a second sink, the vent for the first one no longer perfoms its function, and becomes a "decoration".
    Licensed residential and commercial plumber

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    Plumber jimbo's Avatar
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    You can set up a free account on photobucket.com and upload your photo there. That gives you a URL for the photo which you can link here, or if you keep the pixel count low enough, post using the [img]

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    In the Trades liquidplumber's Avatar
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    Cant see your sink. but you can tie together the 2 basins BEFORE your P trap (like a double bowl kitchen sink), And use 1 trap for both sinks. That way you are vented properly, providing that you were actually vented properly when it was just one sink.

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    DIY Junior Member jonny's Avatar
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    <img src="http://s198.photobucket.com/albums/aa56/bennygohome/?action=view&current=photo.jpg">
    ok so i drew this up on my phone as im at work. Hope you get the gist. The 4" line drains to sewer and vents up through the roof and the 1 1/2" vent ties in to 4" in attic. My question is do i have to revent the 1st floor right handed sink if im coming off with 2 wyes for the first floor. Both sinks would have a wye coming off vertical vent

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    DIY Junior Member jonny's Avatar
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    http://s198.photobucket.com/albums/a...rent=photo.jpg

    It didnt seem like the picture worked so heres the link

  7. #7
    In the Trades liquidplumber's Avatar
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    if i understand correctly... you are tying into a vertical line that has some other fixtures tied into it up above... is that correct? If so, you can tie another trap into that vertical drain IF theres no toilets draining into the vertical line up stream AND you arent overloading the pipe based on its size. So, lets say that youve got a sink or tub or shower,upstream on a 2 inch line.... you can add another sink or 2 downstream and use the existing line as a wet vent for the lower sinks. The only concern would be if you are overloading the capacity of the line you are tying into. (you might, you might not... dont know what size and whats already tied in) However, if the line has a toilet tied in upstream you would have to individually vent ANYTHING you tied into that line downstream. Make sense?

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    DIY Junior Member jonny's Avatar
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    Yes there is 1 sink above tied into the 1 1/2" line then i would tie the 2 sinks downstairs into the 1 1/2 vertical line with 2 seperate wyes coming off the vertical wet vent. Theres a toilet on the 2nd floor that ties into the 4" wet vent The 1 1/2 vertical vent ties above in the attic before penetrating the roof. Could just revent the 1st floor right hand sink above flood level or do i have to vent it above the 2nd floor sink?is it also better to increase the vertical vent from 1 1/2" to 2" to alleviate any vent problems?

  9. #9
    In the Trades liquidplumber's Avatar
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    Ok, so the 1 1/2 pipe you are tying into only has 1 sink on it up above, and then continues into the attic and ties into main vent before going out the roof. If that is correct, and there is nothing else on this 1 1/2 line there is no need to revent anything or increase vent sizing. Tie your new sinks in (dont use wyes use tees) to the vertical section of the 1 1/2 drain and be done with it. This is assuming that you are not overloading the 1 1/2 drain. 3 lavatories would be ok as far as my code here is concerned

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