Wet Vented Trap Arm Size?

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Ryanfornkohl

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What size trap arm/drain is required for a tub/shower that has a trap arm length of 30"? The trap arm has 1.5 p-trap, runs 30" and dumps into stack. This line does not have its own vent, it is vented by the 4" stack.

Reading 908.2 of 2006 UPC states, "Each wet-vented section shall be a minimum of one waste pipe size larger of the upper fixture or shall be one pipe size larger than the required minimum pipe size for the sum of the fixture units served by such wet-vented section, whichever is larger, but in no case less than 2 inches."

Does this indicate that I need a two inch min. pipe from my p-trap to stack? No other fixture tie in.

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Reach4

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Does this indicate that I need a two inch min. pipe from my p-trap to stack? No other fixture tie in.
I think that means 2 inch for the wet vent above the shower santee, not the trap arm.
 

Terry

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The trap that goes to the tub can be 1.5"
2" for a shower pan.
The wet vent portion would be the 4" that you have.
If a lav is wet venting the tub or shower, that would be at least 2".
 
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