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Old 09-28-2010, 07:20 PM   #1
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sink p trap in the basement.


Remodeling a kitchen, and the old setup they had the drain for the sink running through the cabinets beside the sink into the wall (about 5') to the vent stack. Which completely sucked. I had a plumber today tell me that since the sink is 5' or less from the main stack, that he can extend the tailpipe from the sink 4' down into the basement and put the p trap down there and then run it over to the vent/stack and no new vent would be required???

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Old 09-28-2010, 07:34 PM   #2
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sink p trap in the basement.


Maximum length of a tailpiece is 24" so it can't go through the floor.
He's right about 5ft trap arm though. Why not just pipe it in the wall under the windowbehind the cabinet?

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Old 09-28-2010, 08:16 PM   #3
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sink p trap in the basement.


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Maximum length of a tailpiece is 24" so it can't go through the floor.
He's right about 5ft trap arm though. Why not just pipe it in the wall under the windowbehind the cabinet?
I suggested that, but he said not needed, he could just drop the p trap to the basement and be done with it.

What is the 5ft trap arm rule? If the sink is less than 5' from the vent stack it doesn't need a vent source, you can just run a 2" drain to the stack??
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Old 09-28-2010, 08:37 PM   #4
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sink p trap in the basement.


ryanh, I need to back track a bit. 5ft trap arm applies to 2" pipe only. If its 1.5" then the arm can be 3.5' max length.
Every trap needs a vent. Simply put, they help traps drain properly. Its like a gas can that that doesn't pour right until you flip the breather plug open.
The lengths are determined by the slope of the drain line and the pipe diameter.
Realize too that codes vary across the country so he may be correct for your area, but I doubt it. A sink tailpiece is a great place for bacteria and such to accumulate. I would want it as short as possible.
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Old 09-28-2010, 09:51 PM   #5
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sink p trap in the basement.


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Old 09-29-2010, 10:57 AM   #6
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sink p trap in the basement.


Ok. So the trap arm rule pretty much says that if your 5' or less away from the ventstack you can you use 2.0" pipe. Meaning you don't need to add a new stack. Ok gotcha i get it
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Old 09-29-2010, 01:06 PM   #7
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sink p trap in the basement.


As others have noted P2706.2 limits tailpiece lenght (except for clothes washer standpipes) to 24".
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Old 09-30-2010, 10:27 PM   #8
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sink p trap in the basement.


Thanks for the notes guy, This guy just a crackhead plumber. I will find someone else, he also swears on mike holmes that any fixture without 5' of the trap when using a 2" line doesn't need a vent lol

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