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Old 02-06-2012, 01:14 PM   #1
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Plumbing a new location for washer and dryer.


I am moving my laundry to a different location in my single level over crawl home. I had a question about tying the new standpipe drain downstream of a toilet. In the picture below, it shows an existing 3" toilet line coming down into a 3" horizontal branch. Just down from that horizontal branch is the main vent for the home and connection to 4" sewer line. There is a 3x3x2 sanitary tee in the picture where the 2" fixture arm (bathroom sinks) ties in just below the toilet.

1.To remain code complaint, can I make that 3x3x2 a "4" way and tie a separately vented, p-trapped 2" standpipe drain in the fitting?
2. Will this cause any issues in my toilet when wash machine drains? I would have a total of 10dfu's in that horizontal branch. The standpipe trap and vent would be approx 5 feet long, coming from the left side of picture. I looked at the upc, but couldn't find an answer.
3. Also, if this can be done, could I keep the standpipe drain line at 2" (horizontal run) till I get to this fitting or do I need to switch it to 3" after the vertical run through the floor? Thanks!
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Last edited by ncrango; 02-06-2012 at 01:30 PM.
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Old 02-06-2012, 11:36 PM   #2
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Plumbing a new location for washer and dryer.


You cannot put a mechanical discharge on a cross tee, depending where the vent is in the system you can tap in just past the combo, come off with a 3 inch combo then branch the machine with its own vent, not sure under the upc but under ipc you need to bring that washer line up in 3 inch.

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Old 02-08-2012, 08:58 AM   #3
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Plumbing a new location for washer and dryer.


The 3" vent for this bathroom group is downstream of that tee about 6 feet. The tee in question includes a toilet and 2 sinks with the shower drain tying into the branch at where the main vent is. I was hoping I might tie into the branch past that tee like you said and run a separate 2" vent for the washer standpipe. This would put the connection between the toilet & sinks discharge but before the shower drain and main vent stack. If I tie into this just after that tee, less than halfway to the main vent and shower drain, would this be ok you think? Thanks
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