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Old 09-27-2012, 08:49 PM   #1
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Basement bathroom rough-in help...


Hello all,

I am helping a friend rough in the plumbing for a basement bathroom. There was an existing bathroom there but he had to terror out the entire concrete floor and start over due to broken pipes underneath the concrete.

I have poorly drawn a mockup of what I am looking to do. I have researched things as best as I can and have found out that in my neck of the woods the 2009 IPC is what is used. However, there are no inspections done where my friend lives, so although I do want the plumbing to perform properly, I will not have to contend with a picky inspector.

Based on my research (and I apologize in advance if I get some of this wrong) the IPC does allow wet venting with one vent for two bathroom groups as long as it is on the same floor, which this is. And I seem to recall reading that based on a 3" drainline, the furthest fixture can be up to 12' away from the vent. So here are my questions:

1. Would it be better to have the toilet directly inline with the drain, (using a 3"x3"x2" tee-wye) or have it branching off of the main drain as shown in the optional placement in the drawing?)
2. Should I go with my original plan of having two vents coming together (as shown in purple), or can i use one 2" vent (as shown in the dashed green) as long as it is placed close enough that it is within 12' of the farthest fixture?
3. Is it better to have the vent upstream from the toilet (as indicated in the purple option), or downstream from the toilet?(as indicated with the dashed green option)

The main drainline will be 3", and will tie into the 4" drain that currently exists and exits the house. The floor drain, shower floor drain, and washer drain will be 2", as well as the sink and the utility sink until it gets to the p-trap.

All help (especially sooner than later!) would be greatly appreciated, as I am starting this Saturday morning.

Thanks again,

Todd
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Old 09-27-2012, 08:53 PM   #2
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Basement bathroom rough-in help...


Update:

I have found out since I made this drawing that I cannot wet vent the washing machine and possibly the utility sink either. So if this is true, I understand that I would need to vent each of those two fixtures and then tie the together.

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Old 09-27-2012, 08:54 PM   #3
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Basement bathroom rough-in help...


Vents (1 1/2 ") needed for the utility sink and washer---the way you show it now,the P traps are actually S traps---

A licensed plumber will be along soon--Mike---
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Old 09-27-2012, 09:24 PM   #4
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Hi Mike,

Would you mind explaining to me how they are S traps? Are you referring to the utility sink and the washer or all of them? From my understanding the difference between the s trap and the p trap is the length of arm after the trap elbow. Is that right? And that it needs to be at least 2x the diameter of the pipe...
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Old 09-27-2012, 09:56 PM   #5
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Basement bathroom rough-in help...


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Originally Posted by Squints2See View Post
Hi Mike,

Would you mind explaining to me how they are S traps? Are you referring to the utility sink and the washer or all of them? From my understanding the difference between the s trap and the p trap is the length of arm after the trap elbow. Is that right? And that it needs to be at least 2x the diameter of the pipe...
Those 2 traps are not vented. They need vents like the sink on the left wall.
The 2x rule you refer to does not apply because you don't have a trap arm to apply the 2x rule to- trap arms are between the vent and the trap. That's how the UPC applies it
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Old 09-27-2012, 10:23 PM   #6
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Will this work?
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Old 09-27-2012, 10:42 PM   #7
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Basement bathroom rough-in help...


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Will this work?
You said your code is IPC, so I'll let an IPC plumber answer.
It would not pass under UPC
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Old 09-27-2012, 10:43 PM   #8
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Basement bathroom rough-in help...


put a t at utility sink trap then go up to a 90 turn towards wash machine which will also have a t at trap then go up to another t where utility sink vent connects. toilet does not need its own vent in ipc code. put the vent in at shower
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Old 09-27-2012, 10:45 PM   #9
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second drawing will work but need to vent shower
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Old 09-27-2012, 10:49 PM   #10
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so jay,

are you saying that basically i have to have a vent coming off of every fixture except the toilet? Does the lavatory sink vent not serve as a wet vent for the shower and the toilet?
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Old 09-27-2012, 10:56 PM   #11
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Basement bathroom rough-in help...


sink is up stream utility sink to far away
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Old 09-27-2012, 11:03 PM   #12
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Basement bathroom rough-in help...


Thanks for your help, Im just asking so many questions because I am trying to gain some knowledge.

So then you are saying that to wet vent the vent needs to be downstream of the fixture I am trying to wet vent? And your saying that the utility sink vent does not qualify because it is to far away? If this is true, how close would the utility sink have to be to the shower to act as a wet vent for it?

Thanks again for all your help...
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Old 09-27-2012, 11:05 PM   #13
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This is better?
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Old 09-27-2012, 11:08 PM   #14
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Basement bathroom rough-in help...


Another option....

I could put the bathroom vent anywhere on that sidewall if needed. Is there anywhere I could put it that would eliminate the need to have two vent pipes on that wall? Could I put it more in the middle to vent both the shower and the lavatory?
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Old 09-28-2012, 05:46 PM   #15
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Basement bathroom rough-in help...


If I use this configuration with the floordrain tying in downstream of the washer, can I use the washer vent as a wet vent for the drain as long as it is within a certain distance? If so, what would that maximum distance be?

Also, how close does the toilet have to be to the lavatory vent to continue to be able to wet vent the toilet? Since I changed the layout a little bit I want to make sure that I can still wet vent the toilet...

Thanks.
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