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Old 01-12-2007, 02:48 PM   #1
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Basement bathroom rough-in


I just found this site today and am amazed by it...so many helpful people with unlimited information.
I am finishing my basement bathroom that has waste & vent lines roughed in, but I have a question regarding venting and draining the sink. In the attached drawing (albeit looks like a 5 year old made it) can I just connect 1 line from the sink to the vent or is the existing capped line for drainage and I need to add one above it for venting?
Thanks in advance.
By the way the red thing is supposed to be a sink, not the cookie monster.
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Old 01-12-2007, 03:43 PM   #2
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Basement bathroom rough-in


your connection is correct, that is exactly what it suppose to be connected as and for.... I have the similar configuration which I just finished the plumbing in the basement... just make sure you have slope require somthing like x" in y feet dropping...

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Old 01-12-2007, 04:53 PM   #3
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Basement bathroom rough-in


Thanks for the reply, Kui****g.
If I remember correctly I think the slope is something like 1/4" drop per lineal foot.
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Old 01-12-2007, 06:30 PM   #4
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Basement bathroom rough-in


This is not the correct way to make this sink tie-in

In this setup if someone was to clean out this lav line, thet will find themselfs crossing at that tee into the shower vent.

This is against code.
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Old 01-12-2007, 07:59 PM   #5
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Thanks Ron....what do you suggest?
In my diagram whatever is black is existing....meaning this is the way the builders roughed it in.
How do I go about this?
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Old 01-12-2007, 09:25 PM   #6
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Basement bathroom rough-in


Should look like this.

Tee to right picks up lav, tee to left picks up vent from shower, of course your wet venting the toilet, if thats the case. it is code here, and could be code there.
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Old 01-14-2007, 07:56 AM   #7
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So can I even use the existing stubout they left for the lav?
Could I do this?
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Old 01-14-2007, 09:05 AM   #8
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Basement bathroom rough-in


I'm sure you know this, but make sure you use DWV fittings. I'm doing my basement too...
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Old 01-14-2007, 09:44 AM   #9
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How high above sink flood level is the existing capped line, or is it not even above it?
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Old 01-14-2007, 02:39 PM   #10
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No this sketch isn't to scale...it would be below flood level of the sink.
The capped line is 17" off basement slab (centre-line of pipe), the pedestal is 25" high and the sink bowl is about 6" high.
Keeping in mind that right now the sink is in 2 pieces sitting in the corner so I haven't assembled it yet.
Thanks again.
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Old 01-14-2007, 02:41 PM   #11
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I guess that would mean that the capped line would become my drain, not my vent?
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Old 01-14-2007, 07:23 PM   #12
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You can not connect vent below the flood level rim of that sink, you have to vent a min 6" above it. And the capped line cannot become the drain connection, do to reasons stated before.
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Old 01-15-2007, 09:05 AM   #13
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I already did mine, it did pass the inspection though, I think Ron's approach is probably the perfect way of doing it... I think the builder setup the piple for the purpose of someone setting up a bathroom easily... it probably assumes someone to connect the drain to the cap directly without much other piping work, otherwise, they waste time/effort to setup the pipes for the home owner which require to redo the bathroom piping and why they call it "Rough in" in the first place... so I think

Ron's argument do have a point, which is, the builder or most builder not doing a perfect set up... whether this setup is against the code, I doubt, as I said my state inspector didn't point out it as a wrong doing...

So the bottom line is, if you want to make the perfect way, you probably need to forget about most of the pipe set up with the builder and alter it significantly....

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Old 01-15-2007, 04:20 PM   #14
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So is it safe to say that technically all I have to do is connect 1 line from the sink to the capped line (as long as it's sloped to drain) and let it be? I realize this may not be the perfect way but If I do this will I have any major problems to deal with?
I have to agree with Kui****g when he asks why would the builders rough it in that way if it's wrong, but like Ron I also like to do things the right way by the book.
Thanks so much for the quick responses....I appreciate everyone's input.
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Old 01-15-2007, 06:01 PM   #15
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Basement bathroom rough-in


If the line plugs up and one tries to clean it out guess where the cable will go. It will cross that tee and drop down the vent line to the tub.

Do it the way you want to, I can only advise you not to do it that way.

Looking at my picture of the pipes, that tee you see on the right will be placed at center of sink in rough wall. That upper tee is a new tee to pick up the vent from the shower, this making it higher the the sink. Then you take off the top of the tee and vent a min of 6" above the sink flood level rim, If this was me doing it, I would not even use the capped line you show, as a matter of fact, I would take out that cross all together and raise the vent for the shower so it would be higher the the sink also, this will make it all code..
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