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Old 01-23-2015, 05:56 PM   #1
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Sani tee or Y for vent.


I know when I am joining a drain line into a horizontal run I am supposed to use a Y fitting Not a sani tee, and when joining into a vertical run I can use a sani tee.
Do the same rules apply to vent? If Joining a vertical vent line into a horizontal line do I have to use a Y or can I use a sani? This will all be well below the lowest fixture in the house. 2009 IPC.

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Old 01-23-2015, 06:09 PM   #2
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Quote:
Originally Posted by Tubafore View Post
I know when I am joining a drain line into a horizontal run I am supposed to use a Y fitting Not a sani tee, and when joining into a vertical run I can use a sani tee.
Do the same rules apply to vent? If Joining a vertical vent line into a horizontal line do I have to use a Y or can I use a sani? This will all be well below the lowest fixture in the house. 2009 IPC.

Thanks
Can you clarify the bold sentence in your quote?
Vents cannot be joined together when below the flood rim of the fixtures served.
Once you are 6" above the flood rim, you can use tees as it is not considered drainage.
I dont plumb under IPC but I believe the vents must be graded as well- UPC does not
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Old 01-23-2015, 06:17 PM   #3
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give us a picture of what your saying.....ipc chapter 9 venting..
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Old 01-23-2015, 09:02 PM   #4
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A dry vent does not carry any drainage. So you can use sanitary tees to your hearts desire. The Dry vent must always be pitched so it is self draining. This is so condensate doesn't block a vent line.
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Old 01-23-2015, 09:48 PM   #5
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Can you clarify the bold sentence in your quote?
Oops, that was supposed to say below the highest fixture in the house.
I read somewhere else that any venting below the highest fixture in the house needs to use sani or Y's but didn't specify if you must follow the same rules you would use for drain lines.

To avoid unnecessary holes in my framing and simplify the system I was hoping to use a vent scheme like the one pictured below. Take my vent pipes back down under the subfloor, join them all together and take one pipe up through the roof.
However if individual vents from different traps can't be joined until above the flood rim this will not work.


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Old 01-24-2015, 01:33 AM   #6
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If your under 2009 IPC just use an Air Admittance Valve under your kitchen sink.

That photo is missing the required clean out on the vent when it go's from flat into your wall above.
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Old 01-24-2015, 01:38 AM   #7
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Just use a Air Admittance valve much easier.
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Old 01-24-2015, 09:29 AM   #8
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yep that will work ...would like to see a cleanout on the vent pipe going to roof...
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Old 01-24-2015, 09:34 AM   #9
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yep that will work ...would like to see a cleanout on the vent pipe going to roof...
They do work good. But I believe he wants to use multiple foot vents, joined together below the floor to avoid vent piping in walls. That will not work.
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Old 01-24-2015, 10:00 AM   #10
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I did not read his whole question...just looked at the pretty picture....your right that will not work....
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