Stack Vent Requirements


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Posted by Jodi on December 12, 1997 at 08:33:53:

Using the vent pipe sizing tables in the Uniform Plumbing Code, I determined that, in order to only terminate (2) stack vents through the roof, I would need (2) 2" stack vents based upon the respective DFU's for each branch vent. The table does, however, indicate that the effective cross-sectional area of the (2) 2" vents (Vent X-area = 6.28) must at least equal the cross-sectional area of the 4" building sewer (Sewer X-area = 12.57). Therefore, in order to meet code, do I need to use (2) 3" stack vents (Vent X-area = 14.14)?


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