I'm installing a bathroom on the second floor of my home and have run into a few snags. I've decided to drop all the waste lines into a closet beneath the bathroom because I only have 2 x 6 joists and cannot drill the appropriate sized holes through them. The main problem, however, is that there is a 15" offset between where the closet adjoins to the second floor ceiling, and where the nearest wall rises to the roof. This prevents me from creating a waste stack that has a direct vent to the roof. I mocked up my plan in the attached document. Can anyone help me identify... given that I have a 2" vent within 4 feet of the toilet and stack, do I need to directly vent the stack? If so, can I add a vent line below the 3x3x2 Wye and connect it in the attic to the 2" vent I already have in the diagram?

I am working on adding a bathroom to the second floor of my home. One problem I've encountered is that there isn't a wall that runs all the way up from the basement to the roof. Instead, there is a 15" jog from the top of the first floor wall to the bottom of the second floor one (represented by the yellow line in the photo). Fortunately, there is a closet just below, so I can run my DWV pipes into that closet. I cannot vent the stack traditionally though, so I've planned to vent it with a separate 2" pipe that will run from the roof, down the 2nd floor wall, into the closet below and attach to the side of the stack (represented by the red line. Just below the stack vent I plan to place the branch waste line for the shower and vanity (represented by the blue line). Is venting the stack this way acceptable?

Also, as you can see from the photo, the elbow I've installed for the toilet runs right up to the top of the 2x6 joist. I cannot lower it any further because there isn't enough space. How do I get a toilet flange installed on that elbow once the sub-floor and tile are in? Can I cut the top of the elbow and the base of the flange down so that they'll fit together more closely? Any help is appreciated!

Your photo didn't upload. Try again. Good luck, Tom

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You can zig-zag 2" vent with long sweep 90s to reach off-set wall above.

Milo,
What am I missing here? This will be a dry vent correct? If you have no drainage why the long sweep ells? Why not use vent ells, (see image) ?
Does UPC require long sweeps in dry vents? Just curious, Tom

Good Question Tom... Should this vent be in need of cleaning, it is easier to push snake through long 90s than through vent 90s...

Quote:

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Originally Posted by ;

Should this vent be in need of cleaning, it is easier to push snake through

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And a great answer Miloi.
Most of our homes one story tract so if the vents were angled at all it was 45'd into a revent in the attic. Since my company didn't do remodels most of our vents were a straight shot.