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Old 05-18-2012, 01:53 AM   #1
rcspott
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Default Toilet Vent and Wall Size

What size pipe does a toilet vent require and can a toilet be plumbed against a wall with 3.5" studs

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Old 05-18-2012, 06:23 PM   #2
desertwater
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Toilet vent min. Is 2" however you need a full size cleanout before you can reduce to 2" if this is a second floor application you could flat vent a toilet with 2". cleanouts are not required on second floors (residential). and no 3" will not fit in 2 x 4 wall unless its steel stud.



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Old 05-18-2012, 10:44 PM   #3
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That is very much dependant upon which code is in use in your area.

In my area, 1/2 the diameter the drainage pipe served, minimum drain for a toilet is 3", so 1 1/2", with at least one 2" diameter vent for each sewer connection.

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Old 05-18-2012, 11:50 PM   #4
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Depends which code your state adheres to. The International Plumbing Code (IPC) is 1 1/2" but the Uniform Plumbing Code (UPC) is 2"

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Old 05-18-2012, 11:56 PM   #5
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Quote:
Originally Posted by desertwater View Post
Toilet vent min. Is 2" however you need a full size cleanout before you can reduce to 2" if this is a second floor application you could flat vent a toilet with 2". cleanouts are not required on second floors (residential). and no 3" will not fit in 2 x 4 wall unless its steel stud.
3" pipe WILL fit in a 2x4 wall but the fittings will not. And you can not run a flat vent below the flood rim of the fixture unless it is washed by a fixture.

John
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Old 05-19-2012, 01:52 PM   #6
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John, the toilet being flushed is washing the vent. no?

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Old 05-19-2012, 03:06 PM   #7
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If the vent runs horizontal below the toilet there is no way that the toilet could wash it. There may be a small amount of water that will enter the vent but that is the problem. If the line is not being washed the vent could become plugged from waste being left behind in the vent. If the vent was being washed from above like in the case of a lav being armed off the vent it would be fine. No vent can be run horizontally unless it is 6" above the floor rim of the fixture.

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Old 05-19-2012, 03:47 PM   #8
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This is how I see it.

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Old 05-19-2012, 03:52 PM   #9
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The top one is wrong unless there is a fixture draining into the 2" vent above the toilet. The second on is correct you have no horizontal vent lines.

John

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Old 05-19-2012, 03:55 PM   #10
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Ive done a lot of messed up plumbing then :/



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