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Old 08-11-2013, 09:47 AM   #1
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i am planning my kitchen sink drain plumbing. i cannot run the vent horizontally inside the wall, because of very load bearing studs. i do not want to drill these.
so, i am planning to run down through the bottom plate into the basement.

here is the plan, pic, will it work ?
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Old 08-11-2013, 10:06 AM   #2
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No, your trap arm length is too long and you have an S trap.
The vent connection point needs to be at the elevation of the 90.

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Old 08-11-2013, 10:16 AM   #3
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i was afraid you were going to say that

now, i need to find a solution.

can i just use one of those valve vents ?
or
can i run the pipes like in the pic. but, also, run a smaller size pipe to connect as you say they should be ?
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Old 08-11-2013, 11:13 AM   #4
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No!!!!!!!
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Old 08-11-2013, 11:18 AM   #5
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ok. then what are my options ?
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Old 08-11-2013, 11:25 AM   #6
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Chicago land has it's own plumbing codes... They do not follow any national code I know of. I would suggest you pull a home owners permit and ask an inspector to help you out.
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Old 08-11-2013, 11:27 AM   #7
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i am not in the chicago code area. national codes for me.
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Old 08-11-2013, 11:32 AM   #8
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Then eplumber should be able to help you out. But the basic idea is you will need to use a 90 in place of your tee then a tee in a vertical position with one end to your vent the other to your sink.

6 foot from the vent is not a problem with 1.5 inch drain but I practice international code. Eplumber might drop in to help you out he is the UPC guy.
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Old 08-11-2013, 11:43 AM   #9
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I'm not a plumber but what about a loop vent?
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Old 08-11-2013, 10:08 PM   #10
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Quote:
Originally Posted by Fix'n it View Post
i am not in the chicago code area. national codes for me.
National codes is a very broad statement
I use the UPC to base most of my replies.

I added an image for the most common methods to pipe a kitchen sink.
I generally use the one on the left because sinks require a clean out and the configuration allows the CO to be in the sink base cabinet rather than behind a possible dishwasher location.
Notice how the vent is taken off the top of the tee that branches for the trap arm.
For my code, the length of the 1.5" trap arm (E) is 42" Other codes are different.

Someone mentioned a loop vent- I can only use that for an island sink application and they are not easy to plumb.

Auto air vents are treated the same way under my code- only as a last resort and prior approval by my inspector is needed.

Hope this helps some
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Old 08-11-2013, 10:29 PM   #11
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yeah, that helps a lot. but i still cannot go to the left like that. so i have decided that i am going to the right. doing it as you have in the left setup in pic.

i am sure i will have other questions.

but i have this one for now :
how do you get pipes 'inside' the studs ? = 16" or less OC studs and a , say 3'+ pipe.
idk how much pvc will bend. i am thinking, not much.
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Old 08-11-2013, 10:37 PM   #12
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It will bend for the studs @ 16" o.c.
If they are double studs it's next to impossible Then you need couplings

Cut the length you need then try to feed the pipe through the studs- aligning the pipe with the holes as you go by bending the pipe some.
A little persuasion with a 2x4 used as a hammer helps too- as does properly laid out holes
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Old 08-12-2013, 04:54 PM   #13
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The only problem with the one on the left arises if where it go's horizontal it must be 6 inches above the sink top. Usually not possible with modern kitchen construction. Thats why the one one the right is the most often passable method per IPC.

Use a 2 9/16th bit and drill that wood then install wrap around steel plates.

You cannot go horizontal with a vent until you are a minimum of 6 inches above the flood level rim of the fixture you are venting. The reason is to prevent garbage from accumulating in the vent and clogging it. You have no way to easily restore the vent.

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Old 08-12-2013, 08:32 PM   #14
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ok, then i will have to do the one on the right.


how high off the floor should/could the wall connection be ?
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Old 08-12-2013, 09:31 PM   #15
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14 inches is usually good off the floor. For a KS. This allows you to use a disposal.

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