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Old 02-14-2018, 07:29 AM   #1
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Moving a kitchen drainpipe


I am renovating my kitchen which involves moving my kitchen sink. My condo board wants to know how I will be accessing the drain in the new location.

Below is my current setup and my new setup. Without opening the walls I can only guess how the drains and vents are setup.

Assuming theres sanitary tee at the existing kitchen sink location, can a 2 drain be wrapped around the wall as shown in the new layout picture? The drain will slope 1/2 per foot and be within 8 of the vent. Im fairly sure I have 3 1/2 metal studs behind the sheetrock.

Thanks

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Old 02-14-2018, 07:38 AM   #2
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Re: Moving a kitchen drainpipe


Try the photo again.
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Old 02-14-2018, 07:40 AM   #3
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Re: Moving a kitchen drainpipe


That's a fair question, from the board. Is there a cellar? Ask them for a plumbing plan.
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Old 02-14-2018, 08:26 AM   #4
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Re: Moving a kitchen drainpipe





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Old 02-14-2018, 08:28 AM   #5
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Moving a kitchen drainpipe


Quote:
Originally Posted by Guap0_;
That's a fair question, from the board. Is there a cellar? Ask them for a plumbing plan.


There is a basement. Im on the 4th floor. There are no plans.


Im guessing the existing drain runs toward the toilet where the 4 drain pipe is.


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Old 02-14-2018, 08:44 AM   #6
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Re: Moving a kitchen drainpipe


Do you know what plumbing code your town uses?

Given a multi story building, I would suspect a waste stack and vent stack at the existing sink location. They may be difficult to relocate. Since you don't have drawings it will be difficult to give the condo folks an answer without doing demo first.
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Old 02-14-2018, 07:09 PM   #7
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Re: Moving a kitchen drainpipe


Based on what you said so far, moving the toilet is a long shot especially if you can't access the pipes from the floor below.
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Old 02-14-2018, 07:17 PM   #8
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Re: Moving a kitchen drainpipe


Quote:
Originally Posted by TheEplumber;
Do you know what plumbing code your town uses?

Given a multi story building, I would suspect a waste stack and vent stack at the existing sink location. They may be difficult to relocate. Since you don't have drawings it will be difficult to give the condo folks an answer without doing demo first.

Yup pretty sure theres gonna be a santee at the existing sink location with a drain and vent line attached. Ive seen this setup in both bathrooms and my laundry room.

Im going to demo under the sink to find out.




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Old 02-14-2018, 07:25 PM   #9
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Re: Moving a kitchen drainpipe


I feel sorry for the 3rd floor neighbors.
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Old 02-15-2018, 07:18 AM   #10
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Re: Moving a kitchen drainpipe


are the studs structural? because
2.5625" cut out of 3.5" is too much...

is there a window where sink currently is? because that
fact could make vent/drain stack to be further than 8' away

by any code your configuration distance between the vent &
horizontal drain is maxed out at 8' using 2" drain & 1.5" trap

meaning you might have to create a looped horizontal vent above
the flood rim of sink; the closer to the fixture the better IMO
but any windows in the layout could be an obstacle due to height

that said you appear closer to the bathroom plumbing than the
original sink location but I am not saying that would be an
economical nor easier option; just maybe more doable?

do you have the width to install a 3" space between current
wall and new cabinetry ? that would allow you to run the new
drain and water lines in front of wall and behind cabinets...

all that should be needed is a doubled 2x4 attached horizontal
& flat along the top of cabinet bases to secure those bases...
this will only work if you can reach the vent distance within code.

Peace
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Old 02-15-2018, 08:16 PM   #11
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Moving a kitchen drainpipe


DR P

Studs are not structural
No window.
Just redid that bathroom so no tie in option into the new bathroom.

What if I used a 2 trap? Does that buy me any more run?

I might be 9 away. Is that going to cause major issues?

Ill investigate the looped horizontal vent if Im not close enough to the existing vent.

Thanks for the insight!

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Old 02-15-2018, 10:54 PM   #12
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Re: Moving a kitchen drainpipe


At 1/4" per ft venting is lost at 8 ft, code would be less
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Old 02-16-2018, 06:48 AM   #13
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Re: Moving a kitchen drainpipe


Its quite possible the 2 drain pipe under the sink connects to the 4 stack by my toilet. While replacing the subfloor on the bathroom shower, I saw a drain pipe coming from the general area of the kitchen. The distance from the existing sink drain to the toilet is ~14 feet which means the pipe will have to drop 3 1/2 which is quite possible given the 6 of space b/w the bottom of the joists and the ceiling below. Plus all the bathrooms in our buildings have dropped ceilings giving us roughly 3 of space for pipes in the bathrooms.

I am replacing my kitchen tile with wood flooring so I have the option to cut out a section of subfloor to look for the drainpipe and hope its within a reasonable reach from the kitchen floors boundaries.

I have ANOTHER idea that may or may not be easier (not sure its allowed either).

Install a santee at the new sink location and wrap both a 2 drain and 1 1/2 vent line around the walls to the existing santee. Is that allowed?

Thanks




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Old 02-17-2018, 03:59 AM   #14
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Re: Moving a kitchen drainpipe


Quote:
Originally Posted by jaketrades View Post
DR P

Studs are not structural
No window.
Just redid that bathroom so no tie in option into the new bathroom.

What if I used a 2 trap? Does that buy me any more run?

I might be 9 away. Is that going to cause major issues?

Ill investigate the looped horizontal vent if Im not close enough to the existing vent.

Thanks for the insight!

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1.5" trap ensures the 2" drain branch isn't overwhelmed/flooded
while maxed out to 8' before vented; so no a 2' trap would not help
& 9' total linear distance between trap & vent creates an S trap.

If you have a separate drain and vent stacks for kitchen,
the horizontal looped vent has to connect to the vent stack.

Peace
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Old 02-17-2018, 02:13 PM   #15
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Re: Moving a kitchen drainpipe


If your dealing with a condo board I suggest you plan on hiring a licensed professional to do your plumbing.
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