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Hiding a vent line & adding a washer
In our 2nd floor NY home we're finally finishing an attic room. Room has a 3" copper vent line smack dab in the middle of the room, so we're going to hide it inside the floor and knee wall. Floor joists run the correct way for us to get the 5' run to behind a knee wall.
Here's a sketch. Left is as is (vent from below floor to above roof), right shows how I'll add this: cut the existing vent 2 places, connect to 3" PVC with flexible PVC elbows. I'm adding the top two 45 so I can get a simple connection to existing roof vent. (These 45's may be changed to flex couplings depending on how close my roof is to a true 45, I have yet to test-fit anything.)
Also going to add a drain to the clothes washer up there (best not to ask how it currently drains) via a 3" line (the new 2009 code I read here today) with P trap. This line actually runs into the paper but shows sticking out what is really outside of the house for clarity.
All pipe is 3" PVC. All horizontal runs will have proper slope (1/4 per foot).
Does this look like a plan?