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Old 03-04-2013, 11:14 AM   #16
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adding a cleanout


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Simple answer is correct. Each trap needs a vent. They don't have to combine to a common vent stack. If you have seven fixtures- you could have seven vents through the roof- or 2 or 4 or 1....... As I said before, 6 plumbers-6 ways.
Ok, if you had this situation how would you personally vent the first and second story fixtures?

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Old 03-04-2013, 11:31 AM   #17
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Ok, if you had this situation how would you personally vent the first and second story fixtures?
If the wet walls are stacked- probably one 4" vent
If not stacked- probably 2- 3" vents
If more then 1 plumbing wall per bathroom- each wall would vent separately unless I was told to minimize roof penetrations. (ladder work slows down production so I avoid combining vents in the attic)
Kitchen- most likely by itself.
UPC requires that the combined cross sectional area of the vents must at least equal the area of the building drain.
4" equals 12.56 Sq inches- The combined area of your vents must be at least that
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Old 03-04-2013, 11:36 AM   #18
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If the wet walls are stacked- probably one 4" vent
If not stacked- probably 2- 3" vents
If more then 1 plumbing wall per bathroom- each wall would vent separately unless I was told to minimize roof penetrations. (ladder work slows down production so I avoid combining vents in the attic)
Kitchen- most likely by itself.
UPC requires that the combined cross sectional area of the vents must at least equal the area of the building drain.
4" equals 12.56 Sq inches- The combined area of your vents must be at least that
Ok, so when you say wet wall you mean a main waste vent stack behind the bathroom wall? If you were to run 2 separate stacks one main and one secondary, the secondary isn't just a vent stack right? It also serves as a drain then ties into the main stack or main drain line? Other than that if you dont want 2 separate vents then would you simple re-vent the fixtures from the 1st floor so they meet at a point above the 2nd floor?

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