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Old 04-23-2015, 07:52 AM   #31
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Originally Posted by packman123 View Post
Ok..I'm guessing that the 2" part of the tee goes down and the 1.5 is the stub and the other 1.5 connects to the vent with a fernco.
I'm cutting the center and right pipe and capping the center.
Could i use wye with a cleanout and 2 traps instead of the end outlet waste??
And in what order would you do the undersink plumbing?
Thanks Much
Bob

Looks like a good plan. Codes should be met and should drain really well.
Your right hand extension will need the DW stub out above the trap.
Have to either put in a TEE and adapters or use a molded extension tube that has it built in.

Regarding order under the sink, I think it works best to rough in from the sink drain all the way down to the lateral coming out of the trap.

Now you will know where your glued fittings need to end regarding position and orientation. Remove the trap assy to make room to work and recheck as needed.


The photo looks like a 2" trap assy (can not tell from the pic), which is fine, just don't run 2" traps and then reduce down to 1 1/2" drain tee.
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Old 04-23-2015, 05:46 PM   #32
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It's actually a 1.5 trap assembly. If I keep that,then my stub should be 1.5..Is that right? The 2" would be from the tee bottom all the way down..
Would it make better sense to have all 2" pipes under the sink (traps and all)?

So the stub out should always be a little higher than the traps??
And.......Would I just use plumber strap to keep the Stubout Tee attached to the outer wall or just frame something in there to keep it from moving around?

Thanks so much for all the info..

Bob
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Old 04-23-2015, 06:09 PM   #33
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sink drains are 2" per modern codes.
The trap arm and trap for a sink is 1.5" No need for 2"
If you feel like strapping the pipe, that's OK, but shouldn't be needed if your joints are ridgid
The tee should be low enough to allow room for the basket strainer and ptrap. A little lower won't hurt. You can always lengthen the tailpiece between the strainer and trap- this also allows for deeper sinks or disposals in the future.
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Old 04-23-2015, 06:39 PM   #34
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It's actually a 1.5 trap assembly. If I keep that,then my stub should be 1.5..Is that right? The 2" would be from the tee bottom all the way down..
Would it make better sense to have all 2" pipes under the sink (traps and all)?

Bob

Starting at the santee in the wall, anything that I glue is 2". Once I convert to compression fittings I switch to 1 1/2".

1 1/2'' traps are sufficient for a sink drain.

One thing I am not 100% sure of is if the santee stub out is 2" and even though the compression fittings up stream are reduced to 1 1/2, does code consider that a 2" line and require a 2" vent? Maybe our master plumbers will clearify.

When I spoke of the stub out above the trap, I am referring the dish washer stub out. We can not have sewer gas flowing in to the DW.
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Old 04-23-2015, 06:54 PM   #35
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A trap arm is from the weir of the trap- to the vent. This includes the branch of the tee in this case.
Vents and drains are usually sized by the fixture's trap size or drainage fixture units (DFU)
A 1.5" vent is required on a sink and a 2" drain is also required
So, the tee will be a minimum 2x 1.5x 1.5 san. tee- no reason you cannot upsize the vent if you want
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Old 04-23-2015, 07:06 PM   #36
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A trap arm is from the weir of the trap- to the vent. This includes the branch of the tee in this case.
Vents and drains are usually sized by the fixture's trap size or drainage fixture units (DFU)
A 1.5" vent is required on a sink and a 2" drain is also required
So, the tee will be a minimum 2x 1.5x 1.5 san. tee- no reason you cannot upsize the vent if you want

So if our san T is 2 x 1 1/2 x 2 with/a 2" stub out and half the trap arm being 2" PVC glued, and the current 1 1/2 vent remaining at 1 1/2 this would still meet code?
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Old 04-23-2015, 07:11 PM   #37
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So if our san T is 2 x 1 1/2 x 2 with/a 2" stub out and half the trap arm being 2" PVC glued, and the current 1 1/2 vent remaining at 1 1/2 this would still meet code?
Yes, code is a minimum standard.
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Old 04-23-2015, 07:18 PM   #38
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Yes, code is a minimum standard.

agreed,

my concern was by changing the stub out from 1 1/2 to 2" does that change the vent requirement. Sounds like you are saying no
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Old 04-23-2015, 07:45 PM   #39
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Minimum vent for a sink is 1.5". 2" trap arm does not change that.

However- maximum 1.5" trap arm is 42" (UPC). Max. 2" trap arm is 60"(UPC)
So, if you increase the trap arm to 2" the whole way then you can be further(60") from the vent. But you still only need a 1.5" vent- based on the trap size.
My area rates a kit. sink at 3 DFU's. I can put up to 8 DFU on 1.5" vent. I could have another kit. sink on that vent too

IPC has different trap arm lengths by the way....

Have I totally confused you now? I still drive around with my code book in the truck cab.....
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Old 04-23-2015, 08:15 PM   #40
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Quote:
Originally Posted by Yodaman View Post
Looks like a good plan. Codes should be met and should drain really well.
Your right hand extension will need the DW stub out above the trap.
Have to either put in a TEE and adapters or use a molded extension tube that has it built in.

Regarding order under the sink, I think it works best to rough in from the sink drain all the way down to the lateral coming out of the trap.

Now you will know where your glued fittings need to end regarding position and orientation. Remove the trap assy to make room to work and recheck as needed.


The photo looks like a 2" trap assy (can not tell from the pic), which is fine, just don't run 2" traps and then reduce down to 1 1/2" drain tee.
YIKES........
I'm going to leave the san tee stubout at 1.5. I'll glue a small 1.5 pipe into that with a male adapter, and then attach the trap arm to that...Everything below the T will be 2" I hope I got it now!!!! I'm skipping the wye idea and just using the end outlet waste with one trap..
I should've been a plumber!!
The shopping list alone makes my head spin!

Last edited by packman123; 04-23-2015 at 08:18 PM. Reason: adding
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Old 04-23-2015, 08:19 PM   #41
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