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Author:
clancy2323 (MI)
I am a brand new home owner and first time poster! This is my first major project and I'm naturally struggling to comprehend all of the code (Michigan, US). So, I apologize in advance for my ignorance in plumbing  . I really appreciate the help.
In my new house, there are not currently provisions to drain the washing machine. I would like to locate it in the basement, right near the main drain pipe coming from the upstairs. If acceptable, I'd like to splice into this drain pipe and add a standpipe for the washer. There is also a sink drain from the basement bathroom that is spliced into the main drain at the same location that I'm considering. I've found the appropriate dimensions for the standpipe/trap. From my understanding, the drain needs to be 2" pipe with the P-trap 6-18" inches above floor, a standpipe height of 18" to 30", and with the washer indirect connection located above the washer fill line. However, I'm very unsure about venting. I've seen in the code that every trap must be sufficiently vented but I'm struggling to comprehend all of my possibilities for venting this. Obviously, in a perfect world, I would run a vent all the way back up to the roof. However, I'm not sure how feasible this is without tearing into my whole house. Can I use an AAV? Any other creative ways that I can vent this?
I have drawn a quick diagram of my situation. Can anyone be so kind as to help teach me what an appropriate vent for this setup would be?
Thank you SO much.
Edited 2 times.
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Author:
exapprentice30 (MA)
Your sink/toilet should have a vent you could tie into or you may have a future vent capped off in the ceiling. A aav may work if they are legal in your state but they only vent one way and need to be replaced in the future. In my state we can use a ty on it back for a vent for a horizontal drain and other states it must be a wye and 45 or a combo. To replace or add a fitting to your stack you may have to use no hub coupling s if you don t have any movement in the pipe. If your not using the aav you can add a cleanout fitting too.
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Author:
North Carolina Plumber (NC)
Your picture is close being right, the tee for the washing machine needs to be lower than the tee for the sink, the trap and AAV is correct.
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