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Old 12-14-2013, 08:27 AM   #1
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remodel - 2 sinks now but 1 previously


good idea or not ? replace sgle sink vanity w/new dble sink base - that part's good as we have the room BUT can i ' T ' off the existing drain & couple the 2nd drain into it ? new vent pipe for the 2nd sink or live w/gurgling ? would also have to ' T ' off existing supply lines to run to new sink,,, pretty sure shutoffs on existing supply & EACH sink are a good idea, too,,, thanks, guys ! appreciate the help !

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Old 12-14-2013, 08:55 AM   #2
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remodel - 2 sinks now but 1 previously


http://www.bing.com/images/search?q=...electedIndex=7

Only one drain line is needed. If the one you have now is vented then there's no need for another vent.
You can buy the whole set up for a double sink in any box store. It will come with a tee.

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Old 12-14-2013, 09:24 AM   #3
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thanks, joe,,, kinda what i thought but better to ask now than hear buyer's ' home inspector ' give a low whistle as he calls to his helper - ' hey, come look at this !

imagine the existing is vented as it don't gurgle now you're my best friend for the next 4 hrs

' box store ' = gggrrrrrrrrrrrrrrrrr
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Last edited by itsreallyconc; 12-14-2013 at 01:57 PM.
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Old 12-14-2013, 09:52 AM   #4
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remodel - 2 sinks now but 1 previously


Two sinks are doable but you need to watch the trap arm length under the counter. If you go too long you could have gurgle or siphon problems.
Also code requires each fixture to have their own shut offs. You will need to tee off the water lines to do this.
All said- it would be better to open the wall and use a drainage fixture cross or stack to tees. While in the wall move the waters as needed.
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Old 12-14-2013, 01:56 PM   #5
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' trap arm length ', e ? ' too long ' = total length of pipe from p-trap to drain/vent ? how's that defined ? will open wall to run drain & vent

code compliant on the rest - ' tee's ' & shut-off's

thanks, e !
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Old 12-14-2013, 04:22 PM   #6
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Quote:
Originally Posted by itsreallyconc View Post
' trap arm length ', e ? ' too long ' = total length of pipe from p-trap to drain/vent ? how's that defined ? will open wall to run drain & vent

code compliant on the rest - ' tee's ' & shut-off's

thanks, e !
Take a look at paragraph 1001.2 in this link. http://www.iapmo.org/California%20Pl...apter%2010.pdf
This is from the UPC- the code I work under- not sure if it covers your area.
You're interested in the section that talks about lavs.
2 lavs will work on 1 trap if within 30"- kind of like a double bowl kitchen sink.

Something to check out prior to starting- some lavs are stubbed out of the wall with 1.25" pipe
Only 1 lav can be put on 1.25" - another reason I'd open the wall.

You mentioned a home inspector- who knows what he'll find "wrong"- or miss on a walk through. I've gone out and punch listed inspection reports for clients before. I always have a good laugh- "fixing" things that are code compliant because some guy wrote it up.

Edit: that link also shows trap arm lengths in table 10-1. You're interested in 1.25" or 1.5"
Again- this is UPC- IPC are longer lengths.
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Old 12-14-2013, 11:41 PM   #7
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remodel - 2 sinks now but 1 previously


Under IPC the 2 lavs require a 2 inch drain if the are the wet vent.
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Old 12-15-2013, 05:18 AM   #8
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10-4 on fixing things that don' need no steenkin' fixin' ' wet vent ' ? wtfizzat ? this is gettin' complicated,,, i'll jus' give your names to the inspectors

will get into it today,,, thanks, both !!!!!!!!!!!!!!!!!
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Old 12-15-2013, 12:50 PM   #9
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Please do perhaps this inspector can explain IPC to him...
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Old 12-16-2013, 08:21 PM   #10
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Under IPC the 2 lavs require a 2 inch drain if the are the wet vent.
wet vented or wet bend..
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Old 12-18-2013, 04:09 AM   #11
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remodel - 2 sinks now but 1 previously


i get it - that's plumbing-craft/trade humor, right ? we'll use the right stuff & do it the right way,,, mikey's my licensed plumber & knows code,,, all i wanted to know is IF its legal,,, thanks, guys,,, you're a great resource

thanks again !

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