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Old 09-09-2015, 11:18 PM   #1
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Tying into bathroom sink plumbing to supply wash basin in the garage


SF Bay area.
I recently gutted a bathroom in which the sink is on a shared wall with the garage. Would it be OK to tie into the supply lines and drain for this sink in order to install a wash basin on the other side of the wall in the garage? Here is a pic of the sink plumbing, the garage is immediately behind the visible drywall: http://i.imgur.com/711xCnj.jpg


What are the reasons I shouldn't be doing this? Is it wrong to breach the "exterior" garage wall or tie into the sink drain or supply? What else am I not thinking of? Thanks!

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Old 09-10-2015, 03:10 AM   #2
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Is it 1 1/2" or 2" drain?

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Old 09-10-2015, 09:28 AM   #3
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You should seal up around any penetrations that go through the wall.
Don't want exhaust fumes from the garage getting into the bathroom.

Should use metal piping instead of plastic/PVC. Both water supply and drain.
If a car (anything) in the garage caught on fire, it isn't supposed to be able to melt the piping and get through the wall into the house.

Is the proposed sink in the garage high enough to drain into this piping with traps and proper slope? A 2" drain pipe is more likely to be OK having another sink attached to it than smaller.

Is the garage going to possibly ever freeze? If you don't live in a freeze climate this doesn't apply.
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Old 09-10-2015, 11:29 AM   #4
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The drain is 1 1/2".

Is caulking a sufficient seal for the opening or is another method more appropriate?

I'll obviously confirm height berore proceeding but I don't think there is an issue there, nor with freezing.

Thanks for the responses!
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Old 09-10-2015, 05:21 PM   #5
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Please wait for a UPC plumber to respond.
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Old 09-10-2015, 07:05 PM   #6
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I would want to know how it is vented ,,,1st before you proceed
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Old 09-10-2015, 07:12 PM   #7
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From a UPC code standpoint- you can put 2 lavs on a 1.5" vertical drain. However, only one is allowed on a 1.5" horizontal drain line- which I assume it turns horizontal under the floor.
If you are adding a sink (there's a difference between a lav and a sink) then no, it needs to be 2" all the way- vert. and hor.

Once you get it sized correctly, you will then need to add fire caulking or collars. And California may want steel, brass or copper stubbed into the garage for fire rating instead of ABS
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Old 09-10-2015, 08:58 PM   #8
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For venting, the vertical ABS you see pictured just continues upward past where the existing sink joins it and on up through the roof.

So it sounds like I'm looking at upgrading the drainage to 2", some kind of metallic plumbing for the garage and thru-wall portion, then some kind of fire blocking where the wall is breached. Can the vent remain at 1.5"?
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Old 09-10-2015, 09:25 PM   #9
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Yes on 1.5" vent

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