One more way to do it if you only have 1.5 pipe in the wall.
Not UPC code, but not bad either.
Normally you would have 2" on the lower end, and use a fixture cross.
It's safer to have only one P trap for the two sinks, so that would be a continuous waste kit. Of the options you described above, this is the safest. It's described in point (3) above. The reasons have already been described in this thread. It's because of Venting. The excerpted text in the image above does not cover Venting, which must no doubt be covered in another section.
First time poster and thanks for a great site/forum!
Revisiting this to double check on things...
Installing a double vanity where the single vanity was. Here is a pic of the existing plumbing coming out of the wall where the single sink was and a pic of the back of the double vanity. So, in order to do this correctly, I have to plumb according to the pic in post #11, correct?
Last edited by Terry; 05-28-2011 at 08:40 PM.
Awesome, thanks Terry! Forgot a few ?'s..
The copper strap secured to the studs to help hold the hot/cold water lines in place is called a/an..alignment strap or ???
And, if you look closely on the existing hot water line it looks like there is a grounding wire attached. I can't imagine what else it could be so I'll be sure to move that back into the wall and and reattach. Let me know if I need to post a close up...
quote; I cannot figure out whether or not Terry of "hj" are making sense either.
Too many assumptions, to be certain.
Too many vague terms.
That is because you do NOT know what you have now, do not know HOW to revise it, and may not have the ability to do either. A picture of the pipe coming out of the wall and one of the cabinet is absolutely useless to determine HOW, or WHAT, you have to do to make the new installation. And if someone says a "single trap is safer", then I would pretty much reject their advice because they do not either. In many cases posters will ask, "Why do I get a sewer gas smell when I turn on the water", and it is usually a buildup in the sink's overflow and the odor is pushed out when the faucet is opened. IF you use a single trap and a long continuous waste, you have MUCH LARGER area, than a sink overflow, to get a build up, THEREFORE, when you turn on the water in one sink that "fouled" air WILL be pushed out of the other sink into the room. So now you will know the reason for the odor and will not have to ask us where it comes from. The ground wire had BETTER be connected to the cold water pipe, and it is an unusual location for it. It is usually at the water heater.
Last edited by hj; 05-29-2011 at 07:31 AM.
yikes...tough crowd here...i get it...i got it...
No this will cause siphoning of the traps. Check out this thread.Brand new here. I am also trying to convert a single vanity to a double but both the drain and vent pipes are to the left of where both vanities would be. What's the best way to do this? Can I just extend the single arm and just have 2 elbows on the same drain pipe? Thanks.
If I were to add a second lav, I would put a santee below the existing tee on the lav, extend over, long turn 90 up to a second santee looking out, and then revent into the existing 1.5" ABS
Take the shutoffs on your existing lav and throw those away. Those are not reusable.
Save yourself thousands in repairs later and spend $15 now.
Isn't where the black and red pipes meet what you are referring to as below the tee on the lav? I apologize if I misunderstood you, I'm a newbie and still trying to learn all the terms.
I'm pretty sure this is what Terry was talking about (see image). You are best to simply stub the sanitary tee straight out for the sink on the right.