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jackyyboy 03-06-2010 12:20 PM

Vent pipe size for toilet
Hi, I'm installing an all new DWV system in a remodel. An inspector said that a 3" drain on a toilet requires a dedicated 3" vent. If I have a dedicated vent, doesn't the size seem excessive? I had in my memory that the vent for a dedicated water closet drain needs only be 1 1/2"

Plumber101 03-06-2010 09:55 PM

Inspector is a little off. If you are venting just a water closet a 1 1/2" should be fine. But I normally run 2" just because it will be easier to snake from the roof and less 1 1/2 to carry.

Have the inspector show you in code where a 1 1/2 vent can't be used for only 1.5 dfu's

plummen 03-07-2010 09:58 AM

what he said! id use a 2" also for maintenance reasons but 1 1/2" would be legal in my book,just make sure it increases to 4" a foot before daylighting through the roof

Alan 03-07-2010 11:46 AM

2" is code minimum in Oregon.

md2lgyk 03-09-2010 01:21 PM

How far is the toilet from the main stack? You might not need a separate vent at all.

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