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Old 01-18-2013, 09:37 AM   #1
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Re-routing Kitchen sink drain + vent question


Hi all,

I am re-routing our kitchen sink drain and vent and need to ask what I have in mind will work and be legit.

Any help would be very appreciated.

Thank you


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Old 01-18-2013, 10:39 AM   #2
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Re-routing Kitchen sink drain + vent question


Go under the floor, up beside the window, Tee over to the sink location. Continue the vertical stack through the roof as a vent. Similar to the origanal.

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Old 01-18-2013, 10:50 AM   #3
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Re-routing Kitchen sink drain + vent question


Thank you for the reply.

just to make sure, right now the drain and vent pipe are the same, so by tapping my new pipe underfloor into existing vertical pipe would I be ok ?

Not usre if Im clear, but in other word, I would only need to have 1 pipe to connect that do the drain and vent at same time right ? (see image, would that be correct)

Also, should I create a little slope, I have about 6feet to connect to the old drain pipe, how much slope you recommend for 6 feet lenght ?

Thank you

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Old 01-18-2013, 11:01 AM   #4
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Re-routing Kitchen sink drain + vent question


Won't work. You need the vent relocated too. Abandon the existing stack- relocate it to the right side of the other window. Arm the tee over to the new sink location
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Old 01-18-2013, 11:14 AM   #5
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Re-routing Kitchen sink drain + vent question


Thanks again for the reply.

Just for my knowledge, why it would not work ? From what I see, it will be exactly like the original installation, only with diferrence that there will now be a 6 feet horizontal pipe instead of 1 feet connecting with a "Y" into existing drain pipe.

Is it beacause the vent pipe air flow need to be higher than the drain ? Just trying to understand why it wont work
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Old 01-18-2013, 11:28 AM   #6
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Re-routing Kitchen sink drain + vent question


Quote:
Originally Posted by justgrafx View Post
Thanks again for the reply.


Is it beacause the vent pipe air flow need to be higher than the drain ? Just trying to understand why it wont work
Without going into venting theory/practices --yes. Imagine a gas can without the breather open. This is how I would pipe it.
I don't know if you have a basement or a crawl. Under the floor horizontal piping should have long sweep 90's or double 45's when making a 90* turn
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Old 01-18-2013, 11:41 AM   #7
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Re-routing Kitchen sink drain + vent question


Ok, got your point about the venting can, yes make sense.

My problem is that I have a second floor on top is all finish and closed, and going to atics can be not easy job and messy. I have also a basement under and have fulle access to pipes there.

In this case, do you think the other option of going trought joins and 90 corner to connect to existing pipe would be an option ?

If this is not an option, I will do as you say. Thank you again so much for taking the time to reply.
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Old 01-18-2013, 04:27 PM   #8
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Re-routing Kitchen sink drain + vent question


Loop around and use the existing vent. make sure you have a clean out under that sink or if the back is an exterior wall put the clean out facing outward.
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Old 01-18-2013, 04:40 PM   #9
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Re-routing Kitchen sink drain + vent question


Why is no one suggesting redoing the plumbing so it's behind the wall and through the bottom plates?
Sure would make it easyer to set cabinets.

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