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Old 11-01-2012, 10:57 PM   #16
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1.5" vent for toilet with 3" drain?


I need to read the entire thread before I reply.


I see that now, but the footnote in my book is referencing the 16 FU on the 2" vent column.


Maybe my interpretation is all effed up.

At any rate, I know a 2" vent IS DEFINITELY required for a toilet. You are in trouble.

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Old 11-01-2012, 11:02 PM   #17
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1.5" vent for toilet with 3" drain?


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Originally Posted by TheEplumber View Post
Your worst case scenario is to chip out the concrete and replace the 3x1.5 combo and 3" 90.
I work off an older UPC and horizontal wet venting is not allowed so I can't address the latest UPC horz. vent regs. But what you have now would not pass my inspectors. Will it work? Yes. Is it per UPC? No. Will your inspector let it slid? Maybe- if he is a plumber and not just a book smart inspector.
BTW I gotta ask- did you wrap the pipes with 3M tape? Looks like it. I'm curious as to why
Nice catch. I would hate to be the guy cutting a fitting into that later on.


In regards to horizontal wet venting : I've never done it, or had a situation where it will "fit", or even NEED to use it. Conventional systems always seem to prevail.

At any rate, based on the way it was explained to me, his would not work under the horizontal wet venting rule anyway.
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Old 11-01-2012, 11:26 PM   #18
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1.5" vent for toilet with 3" drain?


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Table7-5, footnote 3 states "Except six unit traps or water closets"
I have worked the UPC for more then 20 yrs. Always had to have a 2" vent for a toilet. You can count a WC as 3 FU when calculating total load on the common vent stack but it still needs to be minimum 2".
This is from my '03 UPC which Idaho uses- we have some state revisions but this is not one of them.
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Old 11-02-2012, 08:50 AM   #19
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1.5" vent for toilet with 3" drain?


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Nice catch. I would hate to be the guy cutting a fitting into that later on.


In regards to horizontal wet venting : I've never done it, or had a situation where it will "fit", or even NEED to use it. Conventional systems always seem to prevail.

At any rate, based on the way it was explained to me, his would not work under the horizontal wet venting rule anyway.
Alan - thanks for your reply - even though it is not what I wanted to hear (the point about the tape did not occur to me.

Anyway, I appreciate that you thought about alternative solutions - even though you don't see any. One concern I had about using the pipe that comes up for the laundry is that it is not part of the "bathroom group" - same for the wet bar. Both are 2". I am assuming that when you say this would not work under the horizontal wet venting rule, that is what you mean.
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Old 11-02-2012, 09:02 PM   #20
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1.5" vent for toilet with 3" drain?


i have seen disputes like this go to court just to prove a point. the plumbing code is to protect the welfare of people and to make sure it is functional. so how is it that upc and ipc are so different but still work and are safe just like the size vent needed on a toilet. and in all cases here it was ruled by a judge if it does not affect the welfare and function it is fine and must be past. just like how everything in California can cause cancer. but is it worth the dispute that is a personal decision. it hall comes done to the opinion of the one who has the loudest voice and money
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Old 11-02-2012, 09:20 PM   #21
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1.5" vent for toilet with 3" drain?


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i have seen disputes like this go to court just to prove a point. the plumbing code is to protect the welfare of people and to make sure it is functional. so how is it that upc and ipc are so different but still work and are safe just like the size vent needed on a toilet. and in all cases here it was ruled by a judge if it does not affect the welfare and function it is fine and must be past. just like how everything in California can cause cancer. but is it worth the dispute that is a personal decision. it hall comes done to the opinion of the one who has the loudest voice and money
And in this case, changing a fitting will save a whole lot of people a lot of time, energy, and money.


To the OP : Did you put a 3x2 fitting with a bushing in it, or did you use a 3x1.5" fitting?
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Old 11-02-2012, 10:15 PM   #22
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1.5" vent for toilet with 3" drain?


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And in this case, changing a fitting will save a whole lot of people a lot of time, energy, and money.


To the OP : Did you put a 3x2 fitting with a bushing in it, or did you use a 3x1.5" fitting?
It's a 3x1.5"

I think that there is some ambiguity in the code, but I don't plan to take this to court.

The reason I posted here is that I hoped someone could look at my pictures and see if there is an alternative way to "make it fit."

I think everyone agrees that my setup will work, and it will be safe. If a 1.5" vent can handle 8DFUs, and I'm going to be using a 1.28GPF toilet (the DFUs for which aren't even in the table, but it is probably less than the 3DFUs of a 1.6GPF toilet) - then it seems we have a lot of lee-way - especially since where it stubs out of the concrete, I can easily put a reducing coupler so the vertical part of the vent will be 2". Furthermore, all of my fixtures are independently vented, with the correct size vent or larger.

All I need need to do here is make it work "on paper." If that can be done by horizontal wet venting (I have those two 2" pipes coming up - one for the washer, one for the wet bar, both within 6'), then great. If there is no way to make it work on paper, then so be it.

I believe that making it work on paper will be better, and less work for everyone. That fitting is under a wall - so I'd have to tear down the wall, cut out the concrete, and unwrap that tape. Then, I put it all back together with no-hubs and a new, separate chunk of concrete... Am I really making it better? Is a no-hub as good as a glue fitting? Are separate pieces of concrete really as good as one?

No one has mentioned an alternative solution, so I'm thinking I will probably have to dig it up; nevertheless, I'm going to hold out a few more days in case someone here can see something that I've missed.

Thanks again to everyone who has taken the time to reply - I really appreciate it!!
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Old 11-03-2012, 12:28 PM   #23
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1.5" vent for toilet with 3" drain?


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I think everyone agrees that my setup will work, and it will be safe. If a 1.5" vent can handle 8DFUs, and I'm going to be using a 1.28GPF toilet (the DFUs for which aren't even in the table, but it is probably less than the 3DFUs of a 1.6GPF toilet)
I agree that it will work as well, but again, it doesn't matter what I think.


Table 7-4 talks about what you are discussing here. They rate an unlisted fixture based on GPM discharge capacity. (not that your toilet will tell you what that is anyway)
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Old 11-03-2012, 03:56 PM   #24
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1.5" vent for toilet with 3" drain?


ok here is what you could do is cut 1 1/2 pipe flush with bottom plate cut bottom plate around pipe with hole saw just big enough for a 2 " coupling then glue 1 1/2" reducer bushing inside of 2" coupling then glue in to 1 1/2 " pipe then it just looks like you extended the 2" vent after concrete was poured
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Old 11-04-2012, 11:06 AM   #25
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1.5" vent for toilet with 3" drain?


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Originally Posted by jaydevries View Post
ok here is what you could do is cut 1 1/2 pipe flush with bottom plate cut bottom plate around pipe with hole saw just big enough for a 2 " coupling then glue 1 1/2" reducer bushing inside of 2" coupling then glue in to 1 1/2 " pipe then it just looks like you extended the 2" vent after concrete was poured
I had already thought of this, but it's cheating.

That will work, but usually the inspector wants to see what is under the concrete. If you have to show him pictures, he'll know that it's 1.5"

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