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Thread: How to add Utility Sink and Washer Drain to existing 4"

  1. #1
    DIY Junior Member obriendigital's Avatar
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    Default How to add Utility Sink and Washer Drain to existing 4"

    Hello,

    I am trying to add a sink drain and also a washer box. The black lines in the photo show existing infrastructure. I would like to install a sink and washer box. I am assuming I will need to cut into the 3 to 4" section with the cleanout and install some sort of T with a 2" out to the drain for the sink and washer. Where do I put the P trap or traps and also where is it best to vent. I also have a 2" pipe on the other side of the wall that could be accessed overhead for a vent. Could someone please help draw this out for me? Thank you!!!

    Tim
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    DIY Senior Member dlarrivee's Avatar
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    Every drain requires a trap and vent.

    What makes you think you can tie into the 2" on the other side of the wall, it's likely a drain for a fixture on the floor above...?

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    Plumber jimbo's Avatar
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    Youi need individual traps for the washer and sink. The devil is in the details of what you want to do here, and your drawings dont include details. Important are the fittings, slopes, etc.

    You need to know what that 2" line is before assuming it can be your vent. If it is draining a fixture above, it cannot be your vent.

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    DIY Junior Member obriendigital's Avatar
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    Quote Originally Posted by jimbo View Post
    Youi need individual traps for the washer and sink. The devil is in the details of what you want to do here, and your drawings dont include details. Important are the fittings, slopes, etc.

    You need to know what that 2" line is before assuming it can be your vent. If it is draining a fixture above, it cannot be your vent.
    Thanks for your responses, after further analysis here is where I am at.

    I took a few photos to illustrate the project. I checked the 2" pipe further today and it is draining from a sink upstairs, so that won't work i guess for a vent? correct? this is the photo with the beer by it

    I also have a photo of the new cleanout and T to put into the 4" to 3" stack. Is this ok? The 2" will run around the corner to the sink and washer.
    The other photo is ultimately where I want the sink and washer.

    Lastly, there are a couple photos of the stack towards the ceiling, it looks like the left part of the Y is the main vent, can I tie into that with a saddle to 2" then over my wall to work as a vent?
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    DIY Senior Member dlarrivee's Avatar
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    You need to do a lot more reading before attempting this.

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    Moderator & Master Plumber hj's Avatar
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    You can't use a "saddle" for the vent, and you absolutely CANNOT tie the 2" vent where you indicate in the bottom picture. Your whole concept MUST be changed, but we cannot "draw" a new system without knowing a whole lot more than you have shown us. You have watched too many "Anyone can do plumbing if they know how to glue fittings together" shows.

  7. #7
    DIY Junior Member obriendigital's Avatar
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    Quote Originally Posted by hj View Post
    You can't use a "saddle" for the vent, and you absolutely CANNOT tie the 2" vent where you indicate in the bottom picture. Your whole concept MUST be changed, but we cannot "draw" a new system without knowing a whole lot more than you have shown us. You have watched too many "Anyone can do plumbing if they know how to glue fittings together" shows.
    Thanks for the replies. The thought was to put the vent in the top picture, that's a 3" vent. The bottom photo shows how that pipe turns and runs out as a vent....my arrow depicts the top photo. They are out of order.

  8. #8
    DIY Junior Member obriendigital's Avatar
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    Quote Originally Posted by dlarrivee View Post
    You need to do a lot more reading before attempting this.
    Thanks for your help. i will keep reading, but I think I have everything to specs, just unclear on vent process. Here are some photos that may better illustrate it.
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    One who lurks Basement_Lurker's Avatar
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    Wow, look at all the electrical lines bundled together....very naughty!
    Broken promises don't upset me. I just think, why did they believe me? -Jack Handy


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    Forum Admin, Expert Plumber Terry's Avatar
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    The sink needs a vent
    The washer needs a vent.
    Both vents can be tied together above the washer box, and then run upstairs and tied in at 42" above the next floor.
    That means cutting the wall upstairs and dropping a vent down for lower floor plumbing.


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    In the Trades SacCity's Avatar
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    Did you use PEX or soft copper for the short runs up to the washer?
    Michael
    Last edited by Terry; 04-06-2011 at 09:20 PM.

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    Forum Admin, Expert Plumber Terry's Avatar
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    Those were PEX, and I insulated them mainly because there was light coming through a window and I had no idea how soon there were going to cover.
    Normally I would have run hard copper. I had an inspector in Seattle that made me take out soft copper in a wall like that. You never know what they're thinking. I would think that type L soft would always be better then M hard. And I'm a big fan of "fewer" fittings.

    hj will argue that it could have been done with a wet vent, but this configuration will pass in all fifty states.

    Last edited by Terry; 03-27-2011 at 09:24 AM.

  13. #13
    In the Trades SacCity's Avatar
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    I strongly agree with you on the fewer fittings idea....
    What I am always concerned about is changing materials,
    Copper -plastic - copper etc...

    Are there any issues with mating soft copper to rigid copper?
    My thought is that the difference is heat treatment, but just guessing.
    I'm here to get an education .

    As for the PEX good call on the insulation, as PEX is rated for 1 day sun exposure, and the UV rated stuff is for 30 days....
    Michael
    Last edited by Terry; 04-06-2011 at 09:19 PM.

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    Forum Admin, Expert Plumber Terry's Avatar
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    I've never had a issue with soft to hard copper joints. Even the old 50/50.
    The No-Lead solder makes a joint so tuff that the pipe will break before the joint does.

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    Plumber jimbo's Avatar
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    Can't tell for sure which way is 'up' in the photos. That pipe that you call a vent...is that horizontal , and below the floor where the toilet it?? That is not acceptable.

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