Using a TY to transition from horizontal to vertical

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jon1234

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I am looking to replace some old copper drain with PVC.
Current setup is annotated in picture. 3in copper from toilet runs into brass T and down through vertical stack. The other arm goes to an elbow that connects to 3in vent that goes up through the roof. [The partition wall in the second floor bathroom which contains the vent is not directly above the wall in the first floor bathroom which contains the drain stack, which is the reason it was done like this.]
Would current code allow this setup to be replicated with PVC, using a san-T or TY?
I'm in NY and we use ICC. I've read through Ch. 7 (sanitary drainage) several times, and unless I overlooked it, I didn't notice anything that would prohibit this setup.
 

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wwhitney

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The arrangement is prohibited because you have a horizontal dry vent section between the top of the stack and the vertical dry vent. Any vent takeoff must be on the upper half of the drain, IPC 905.3.


So what you need to use is a 3" san-tee with the barrel vertical and the WC coming into the horizontal side entry. Then put a street 45 into the top entry. Then into that either a street 45, or a short pipe segment and a regular 45, whatever provides the correct offset to line up with the vertical vent.

If that doesn't fit vertically in the available space, you'll need to do some more significant rerouting of the WC drain, stack, or vent.

Cheers, Wayne
 
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Hey, wait a minute.

This is awkward, but...

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