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Author:
fredcapo (NJ)
I would like to modify a stack from a single toilet in order to correct a problem.
Presently 4 in pipe from toilet goes into 4 inch 90 elbow (with 2 in vent on top) goes into top of 4 in stack.
I want to remove the 90 elbow with 2 inch top vent, and install a sanitary tee about a foot or so lower than the orig elbow..the 4 in toilet pipe would then have to double 90 down to go into the sanitary tee. The top of the sanitary tee would be my new vent.
Is there any code problem with that? Thanks.
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Author:
packy (MA)
fred, i have read you post numerous times and i am not sure i understand???
it sound like you want to stack one toilet drain ontop of another??
you can do it if you individually vent the lower toilet seperately using the existing 2 inch vent.
my question is, why is the original toilet vented with 2 inch?
is there another bathroom on the stack. if so then you need to vent both toilets.
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Author:
fredcapo (NJ)
No. The old 4 inch cast 90 with 2 in vent was cracked. It was at the top of the 4 in stack with only the 2 inch vent above it going thru the roof. Only the toilet (and a basin) on that stack.
I need to replace the cracked 90, and I would like to directly add a vent for a wet vented tub in the process.
It would make it somewhat easier if I could run the 4 inch line from the toilet (and basin) down with a 90 and then back into a sanitary tee ( or 90 with top vent) that would be perhaps a foot lower than the original cracked 90 which is eliminated.
So only 1 toilet snd basin and vent plus new tub vent on this stack.
I just don't know if it is OK to have two quick 90 bends in the pipe from toilet to the stack. Thanks.
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Author:
hj (AZ)
It is "okay" but I would NOT do it. Without know EXACTLY HOW you plan to run the piping, I am not even sure that the tub would be connected correctly, especially when you state that it will be "wet vented". Wet vented by what, not the toilet, I hope.
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Author:
fredcapo (NJ)
Tub is presently on a long single 1.5 drain that runs to basement and bottom of stack. So I don't know if that is considered wet vented...
But I woul like to connect the tub now to the stack to improve the venting.
Thinking now to connect tub 1.5 drain to a second sanitary tee on the vented main stack.
Are two sanitary tees allowed on the same 4 inch stack? Thanks.
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Author:
hj (AZ)
You can install as many "T"s, "Y"s, or combos in a stack as you want or need. The problems come in AFTER they are installed and you start connecting things to them incorrectly.
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Author:
fredcapo (NJ)
OK. Thanks for the info. I have a licensed plumber friend coming to look at my plan. I am a bit hosed about you saying it's ok to do something, implying it is code compliant, but qualifying it with "done correctly"...so will have it reviewed by the plumber. Thanks.
Edited 1 times.
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Author:
hj (AZ)
The "concept" may be code compliant, but how you ACTUALLY install the final piping will determine whether the installation is correct. I have seen people DRAW a perfect system, but install it completely wrong, to the extent that I had to saw it completely out and then install it according to the original drawing.
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Author:
packy (MA)
fred, if you have the room you can drain the tub and the lav into the 2 inch toilet vent.
and, as hj was trying to say, you can do this legally but there are restrictions as to what can go where and how far away from the vent the traps can be.
you can put a sanitary tee with a side inlet into the top of the 4 inch stack and use the 3 inch branch for the toilet, the 2 inch side inlet for the tub and reduce the top of the tee to 2 inch and use it for a vent and lav drain.
lots of possibilities.
Edited 1 times.
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Author:
fredcapo (NJ)
Guys thanks for your time and patience in explaining. A bit confused now about Packy explanation using sanitary tee for 3 connections... I only can visualize 2 ports once it is on the stack...
I plan to first reduce the top of stack to 3 in, then use 3x3x1.5 san tee for tub and 3x3x2 above for toilet and vent. Toilet and lav combined branch is actually a 3 in brass pipe with a 4 in flange.
Edited 1 times.
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Author:
hj (AZ)
quote; use 3x3x1.5 san tee for tub and 3x3x2 above for toilet and vent. Toilet and lav
Now, that is what I meant by "proper connections". You CANNOT connect the tub below the toilet unless you also add a proper vent for it
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Author:
fredcapo (NJ)
Ok. With that device the tub and toilet discharge at the same level.
What is the technical difference with the toilet above or at roughly same level? Is not the same amount of air available either way? Thanks.
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Author:
packy (MA)
fred, if you look closely at the photo the center of tub inlet is slightly ( and i do mean slightly) above the center of toilet inlet. it might only be 1/4 inch but it is higher..
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Author:
hj (AZ)
There is a BIG difference in the way the water flows past the 2" opening, even when the 2" and 3" are on the same centers.
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