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Author:
164210 (PA)
I have a toilet that I am moving. It will be in the same area but turned 90 degrees so I have to redo the plumbing for the drain. The toilet is located on the first floor and I have full access in the basement. As of right now the drain comes straight down below the floor joistsinto a 90 degree elbow then runs horizontally approx. 2 feet to the main 3 inch drain stack. There is nothing above as this is a one story house. The stack is 3 inch pipe and continues straight up to vent through the roof. My question is what fitting to use to tie the horizontal toilet drain into the main drain? Right now it is connected with a 3x3x3 sanitary tee. I was told that I should connect it to the main drain with a wye fitting. So it would go horizontal to a 45 elbow then into the wye. The toilet is not vented elsewhere. Also right now on the main 3 inch drain below the toilet connection is the drains for the bathroom tub and sink. They are connected with a double sanitary tee. The tub and sink have their own vents after the p trap. Should those be connected to the stack with a wye as well?
Hopefully this isn't too confusing. Thanks.
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Author:
hj (AZ)
I guess the first questions would be;
1. If you are just rotating the toilet, why can't you use the same opening, and,
2. What does that have to do with the sink and tub drains if you are not changing them.
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Author:
164210 (PA)
Sorry I should have clarified. I am rotating but I have to move it a few inches in addition to make proper clearance with the wall
I included the tub and sink question because I figured if I was replacing the toilet connection I could "easily" fix that if it was wrong.
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Author:
Palm329 (VA)
I think the follow up to HJ's point is you don't need to run a new branch to the stack, just cut the current toilet line somewhere in that 2' horizontal run, and add some new pipe to bring it up below the new hole. Leave everything else the same...
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Author:
164210 (PA)
OK that would probably be easier. I just wanted to make sure the sanitary tee in that connection the the vertical pipe was OK. I think the previous owner DIY replaced the CI with PVC at some point. I figured if i was doing the work I could fix it if it wasn't legal.
Thanks
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Author:
packy (MA)
a san tee used in a vertical pipe is code everywhere. even massachusetts...
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Author:
Palm329 (VA)
In fact, that sani tee might be required since that toilet branch is unvented... If you replaced it with a wye then some people here would tell u you need a vent on it. Others might think a toilet doesn't need a vent. Some codes want it tho.
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Author:
dlh (TX)
if you used a wye then you would have to vent the line that is already vented using the san-tee.
i would go with just installing a fitting to move the stand pipe to where you want it
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Author:
packy (MA)
MA code says the toilet vent can be up to 20 inches below the floor. so whether you use a "Y" or a "TY" it is within my code.
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Author:
dlh (TX)
ok but what does how far below the floor it can be have to do with using proper fittings? now if you mean just coming up straight off the "Y" then ok but not if they are going to turn out then up which is what they would probably have to do since it is like 2' from the stack
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
164210 (PA)
So below is photo of the current set up. Everything works but I want to be sure it's correct.
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Author:
packy (MA)
both 1 1/2 inch lines that connect below the toilet must have their own vents. they can not be stack vented with a toilet draining above them.
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Author:
164210 (PA)
The 1.5 inch branches both do have vents just after the p trap. Is that connection ok if they are vented?
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Author:
Palm329 (VA)
If both 1.5's are indeed vented then why is a double sani tee being used rather than a double wye?
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Author:
164210 (PA)
I have no idea. I didn't do it. I was asking if I should change it out to a double wye.
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Author:
Zgib (NV)
A double San tee is legal when used in a vertical position, therefore, there's no need to change it.
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