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Old 05-16-2017, 03:13 PM   #1
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master bath plumbing question


I am currently renovating my MBR and have a plumbing question. The bathroom currently has one sink. The 3" drain/vent stack is located between the toilet and the existing sink. For reasons I won't go into, relocating the drain is not an option. I am adding a second vanity and sink, so I will basically have two sinks to the right of the drain. That's problem #1.

Problem #2 is the house was built in 1979, and all of the plumbing is ABS. ABS isn't sold anywhere around here anymore, so my new plumbing will have to be PVC. I was hoping someone could take a look at this diagram I drew up for how I think I can achieve what I'm trying to do. I think my best approach would be to do all of my new plumbing in PVC and connect my new work to the old work with a fernco, FL code doesn't allow for using ABS to PVC transition cement even on DWV pipes.

Thanks for looking and I'm open to any comments or suggestions.

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Old 05-16-2017, 06:24 PM   #2
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Re: master bath plumbing question


Why don't you order the abs fittings you need?
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Old 05-16-2017, 06:33 PM   #3
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Re: master bath plumbing question


ABS isn't available here any longer, likely because it emits hydrogen cyanide if it ever catches on fire. I have new runs of drain pipe off of the lavs also, and FL code prohibits solvent welding PVC to ABS. So even if I could find the proper ABS fittings, it wouldn't do me any good since straight runs of ABS are nowhere to be found. That's why it made sense to me to do all new plumbing in PVC and just connect to the ABS drain with a fernco.

Anyone else care to give the thumbs up or thumbs down on my diagram?

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Old 05-16-2017, 06:50 PM   #4
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Re: master bath plumbing question


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Old 05-16-2017, 08:15 PM   #5
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Re: master bath plumbing question


Only use a proflex band from pvc to abs not a all rubber fernco.

Upper tee must turn to roof. That vent pipe needs to be 42 inches to center or higher in the horizontal. 6 inches above your sinks flood level rim is normally 42 or better.
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Old 05-16-2017, 08:54 PM   #6
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Re: master bath plumbing question


Recognising I AM NOT A PLUMBER, and I don't know if your a upc or irc... as if I even knew the difference...

Couple of comments, your top wye on the vent stack (or santee) is upside down.

Your venting of the sink on the right needs to be on a trap arm.

(I can't enlarge the pic, so I can't read pipe sizes etc and tell exactly what I'm looking at and made some assumptions )

And I think the steel jacketed Fernco is required coupling from PVC to ABS.

I'll await for our very good pro's to come along. THIS IS A GUESS

Good luck
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Old 05-16-2017, 09:52 PM   #7
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Re: master bath plumbing question


Should be able to do this.
You have 8 foot to vent with 2" drain.
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Old 05-17-2017, 06:25 AM   #8
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Re: master bath plumbing question


Thanks for the responses everyone. Yes, I see now that my upper santee is upside down, thanks! Also, yes I am planning on using a shielded coupler, not all rubber.

hkstroud, I was always under the impression that you can't have two sink basins inline like that on one drain pipe, am I wrong about that? If it's OK, that would make this job a lot easier. I assume if I did it like that I'd need to still add a second vent for the second sink. Both sinks with be within about 30 inches of each other O.C. My total run from lav 2 to the drain is about 5 feet, so I have more than enough leeway in terms of length to work with.
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Old 05-17-2017, 06:54 AM   #9
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Re: master bath plumbing question


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I was always under the impression that you can't have two sink basins inline like that on one drain pipe, am I wrong about that? If it's OK, that would make this job a lot easier. I assume if I did it like that I'd need to still add a second vent for the second sink. Both sinks with be within about 30 inches of each other O.C. My total run from lav 2 to the drain is about 5 feet, so I have more than enough leeway in terms of length to work with.
The lavs in the picture will not pass any codes I have worked with. Follow Ghost's directions listed above and you should be fine
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Old 05-17-2017, 07:53 AM   #10
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Re: master bath plumbing question


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The lavs in the picture will not pass any codes I have worked with. Follow Ghost's directions listed above and you should be fine
Thanks for the response. Which lavs won't pass code, my diagram or the actual picture from above? I always thought having two waste arms inline on one drain pipe like that would lead to a siphoning effect if you were running the water on lav 2 past the arm for lav 1; i.e. you'd suck all of the water out of the P trap on lav 1 if you were using lav 2.
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Old 05-17-2017, 09:11 AM   #11
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Re: master bath plumbing question


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Thanks for the response. Which lavs won't pass code, my diagram or the actual picture from above? I always thought having two waste arms inline on one drain pipe like that would lead to a siphoning effect if you were running the water on lav 2 past the arm for lav 1; i.e. you'd suck all of the water out of the P trap on lav 1 if you were using lav 2.
Your drawing is a correct method.
As shown in the picture will not pass inspection in my area

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Old 05-17-2017, 09:53 AM   #12
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Re: master bath plumbing question


Thank you everyone for the responses.
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Old 05-17-2017, 04:35 PM   #13
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Re: master bath plumbing question


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Originally Posted by hkstroud View Post
Should be able to do this.
You have 8 foot to vent with 2" drain.
Not legal stroud. You have 1 unvented trap passing another trap in the horizontal. Now if you placed a vent in between the two traps it might be legal circuit vent or common vent but your other minor issue is improper use of fittings using a sanitary tee in the horizontal picking up a trap.

If you wish to do it this way you need to use a wye and a 45 on the first sink trap then a vent on a sanitary tee then a 90 for the second sink trap. You must vent in between the two traps.
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Last edited by Ghostmaker; 05-17-2017 at 04:39 PM.
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