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ok, that's helpful, thanks Wayne. I see now in the definitions the "extends through not fewer than one story" definition for a stack. In my situation I have a 1-1/2 inch vertical drain line (and vent) for softener regen waste water that is located in a garage -- so it does not extend...

Looking at IPC 710.1(2) for a 1.5 inch pipe, if I'm reading it correctly, it's telling me I can carry 3 DFUs horizontally but only 2 DFUs if it's vertical (per interval). The DFU capacity on a single branch interval is lower when used as a stack than for a horizontal run. Under UPC, table 703.2...

I want to add a utility sink to a garage and ideally use a 1.5" drain line that was initially installed to capture the regen water from a softener. The softener is located in a machine room and drains, via 0.5" PEX, into the open end of an exposed 1.5" ABS drain pipe that runs in vertical...