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Old 10-30-2016, 06:21 PM   #1
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Drain Route and Venting for new kitchen sink drain (window above sink)


Hi,

I am planning to move the location of the existing kitchen sink location to another corner of the kitchen where there would be a window directly above the new sink location.

This new sink location would be about 14 feet away from the existing kitchen sink location (going along the wall space).

Drain:
I'd need to open up the wall and have the drain line run all the way from the new location of the sink -- inside the wall, across all the studs, back to the existing sink location where it would route down to the main drain. Or there's a different way to route the drain line besides going across at least 4 studs inside the wall?


Venting :
I am thinking about the venting for the new drain at the new sink location. Would anyone have an idea how this can be done since there's a new window above the new sink location? There is venting to the roof above the existing kitchen sink's drain line.

Thanks.

Drain Route and Venting for new kitchen sink drain (window above sink)-sink-location.png

Last edited by joemc3; 10-30-2016 at 06:26 PM.
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Old 10-30-2016, 07:53 PM   #2
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Can you access the waste pipe from below? Then you could cut the pipe, either tee in or put an elbow in, and rout the drain pipe to the new sink location. The Vent pipe can run around the window, or any other route it needs to tie into the existing vent.


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Old 10-31-2016, 02:02 AM   #3
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Quote:
Originally Posted by gary.bruzzese View Post
Can you access the waste pipe from below? Then you could cut the pipe...
There's a crawl space below the flooring. The other side of the wall behind the existing sink is the garage.

Drain Route and Venting for new kitchen sink drain (window above sink)-sink-location.png

If you meant a cut on the existing drain pipe from the sink, I'd have to route along the foundation concrete to the new sink location. Is that a better route?

Another way is make a cut on the main drain to create a new drain route to go straight from the new sink location in the crawl space.


For the vent, the new location has a 4 ft wide window, almost all the way to the top of the wall,

so if I need to route the vent it'd be starting a couple of inches above the new sink location and then go horizontally (upward slightly) inside the wall thru' several studs to meet the old vent location.

Last edited by joemc3; 10-31-2016 at 02:15 AM.
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Old 10-31-2016, 06:18 PM   #4
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Bring your drain up to the right or left of the window. Install a sanitary tee with the branch to the KS drain by drilling out the studs below the window. The vent will come off the top of the sanitary tee. 16" to center is the normal height for a normal sink drain stub out of the wall.

You can not run a horizontal vent below the sinks flood level rim.
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Old 10-31-2016, 10:49 PM   #5
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Quote:
Originally Posted by Ghostmaker View Post
Bring your drain up to the right or left of the window. Install a sanitary tee with the branch to the KS drain by drilling out the studs below the window. The vent will come off the top of the sanitary tee.
Great Tip!

I still wonder which way is better to run from the new drain --

go thru' the studs in the wall to the old drain location , or make a cut at the main drain and run straight in the crawl space area to the main drain?


Quote:
Originally Posted by Ghostmaker View Post
The vent will come off the top of the sanitary tee.
I suppose then the new vent would go up to the roof from the side of the window, no need to route back to the old vent location.
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Old 11-01-2016, 05:09 AM   #6
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


That's a good idea ghostmaker had. But wouldn't it be better to bring the 2" drain up from the crawl space at the proper location, place a san tee 16" above finish floor, and a bushing to reduce the vent to 1 1/2". Then route the vent to the side of the window. Benefit of this, is you would be drilling smaller holes through your studs. Not sure, but if he has a 2x4 wall, and it's load bearing, the 2 1/4" holes could be a problem. I'd prefer to keep the holes as small as possible.


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Old 11-01-2016, 11:10 AM   #7
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Why not save yourself the trouble of venting and use an air admittance valve?
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Old 11-01-2016, 11:24 AM   #8
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Quote:
Originally Posted by Bret86844 View Post
Why not save yourself the trouble of venting and use an air admittance valve?


Because that's a last resort, not an easy out. And not allowed in some jurisdictions.


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Old 11-02-2016, 01:27 AM   #9
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Quote:
Originally Posted by gary.bruzzese View Post
But wouldn't it be better to bring the 2" drain up from the crawl space at the proper location
The wall where the kitchen sink/window is located is an exterior wall, so below the dry wall it's the crawl space concrete wall.

I wonder then how to 'bring' the drain into the dry wall from the crawl space below? It'd have to come in from the crawl space at an angle?

Someone can shed some light in this?
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Old 11-05-2016, 01:39 PM   #10
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Quote:
Originally Posted by gary.bruzzese View Post
That's a good idea ghostmaker had. But wouldn't it be better to bring the 2" drain up from the crawl space at the proper location, place a san tee 16" above finish floor, and a bushing to reduce the vent to 1 1/2". Then route the vent to the side of the window. Benefit of this, is you would be drilling smaller holes through your studs. Not sure, but if he has a 2x4 wall, and it's load bearing, the 2 1/4" holes could be a problem. I'd prefer to keep the holes as small as possible.


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you cant offset a vent below the flood rim.
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Old 11-05-2016, 01:58 PM   #11
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


So raise the vent above the flood level before you offset. That simple.


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Old 11-05-2016, 06:15 PM   #12
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Quote:
Originally Posted by gary.bruzzese View Post
So raise the vent above the flood level before you offset. That simple.


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Impossible to do under the sink cabinet. The flood level rim is the sink top.
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Old 11-05-2016, 06:17 PM   #13
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Re: Drain Route and Venting for new kitchen sink drain (window above sink)


Why's that impossible? Should be at least 6" between top of sink and window.


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