Since CA is now allowing horizontal wet venting, does this ground floor powder room drain/venting look proper? There will be a full size toilet, a kid toilet and a lavatory. Combos are installed flat(not rolled).

Thanks, Fred.

you need to add a vent line in between the two toilets. with wet venting you can not drain a major fixture over another major or drain a major over a minor fixture. you will need to roll the combination up at a 45* and straighten out with a 45* elbow.

dont forget the full size line clean out on the vents

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PLUMBERS "Protecting The Health Of The Nation"

Thanks dlh, I'm asking this and not arguing your reply, if the two toilets couldn't be both on the same wet vent, shouldn't the code state this? When it states that "Any combination of fixtures within 1 or 2 bathrooms...shall be permitted to be vented by a wet vent.", along with the rest of that code section, to me it reads that any and all fixtures can be on the wet vent, as long as the dry vent connection is not from a toilet. Are you on IRC or UPC? Does your code state no major over a major?

every code states that. it is one of the rules of wet venting. you are only looking at one part of the code and it does not tell you how a wet vent can be ran.

what you are looking at just states WHERE a wet vent can be ran

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PLUMBERS "Protecting The Health Of The Nation"

Horizontal wet venting is new to CA and this is the only text in the 2007 California Plumbing Code that deals with horizontal wet venting. The section on vertical wet venting, which has been the same for many code cycles, also doesn't speak of it.

you have it wrong. you can not vent out the back end of a "Y". the "Y" needs to be between the toilets as DLH said. you, also, can not have a sanitary "T" on it's side as you have drawn.
start over again...
all fixtures drain straight thru a "Y" and all vents come off the rolled up branch of the "Y".
see if this makes any sense...
[smg.photobucket.com]

Packy, the long turn 90* is pointing up, with the san T, C.O. and dry vent installed on top of it. Do your code books state the no major over a major? Would both wyes need to be rolled? With the final wet vent take off between the toilets, there is still a major draining over a major.





Edited 2 times.

well that part is ok but the rest of it needs to be re-worked. as packy said you can not vent out the back of a wy fitting. you need to come off the drain line in-between the toilets and roll the wy up for the vent

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PLUMBERS "Protecting The Health Of The Nation"

Even if it were allowed, it would not be a good idea. The water from the vented toilet going past the unvented one could create a venturi effect and pull the water out of it.

hj, I believe '06 UPC has the same code section written in it. Is the code section missing the information about a major over a major, or is this an unwritten installation standard? When the code section states that any combination of fixtures from 1 or 2 bathroom groups can be vented with "A" wet vent, how can you not have a major over a major? The use and placement of fittings is discussed in Section 706, with a horizontal drain connecting to a horizontal, there is no mention of rolling the fitting. With Section 905 saying that a vent take off from a horizontal drain, needs to be taken off above the centerline of the drain, is a wet vent considered a drain or a vent?

the code sections you posted are just a small part of venting. i looked it up in the '06 UPC and your section 908.4.2 is missing the first sentence from the UPC which states it needs to comply with section 905.2 which tells you to roll the vent up.

the code you posted is just bits and pieces of what the UPC says even though the code section numbers are exactly the same.

it seems CA. wants to be a UPC state but it doesnt want to get into the details of proper plumbing practices.

no wonders you dont need a plumbing license in CA. they just have a general code and if you are close then it is good enough



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PLUMBERS "Protecting The Health Of The Nation"

that looks alot better. my code does say that a wet vent must run undiminished in size thru the roof or to a vent stack.

so does the UPC but it seems CA. is just adopting bits and pieces of it and not adding anything of their own to tell plumbers how it is supposed to be installed

at the sanitary-tee for the sink you can reduce the 3" to 2" and go from there since that is where the actual vent starts

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PLUMBERS "Protecting The Health Of The Nation"



Edited 1 times.

As the warning at the beginning of the section you posted states, "where permitted". I would check with your local jurisdiction to see if they allow bathroom wet venting. As for the seeming confusion in CA as to how to deal with wet horizontal wet venting, dlh is right. CA's all over the map on this one. And until IAPMO addresses the ambiguities in 908.4, the confusion will continue.

The aspiration factor is why you should not have two majors or a major over a minor. Since the pipe is being washed/flushed by the drainage from the sink, it is a drain.

I'll just add a dry vent to one of the toilets and wet vent the other.

no. the confusion will continue until CA. either adds something to their code or adopts the full UPC which does clear up the "ambiguities" you see in the partial paragraph they did adopt.

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PLUMBERS "Protecting The Health Of The Nation"

I live in Calif and our building dept. uses the UPC code.

looks like it will work fred2, good luck

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PLUMBERS "Protecting The Health Of The Nation"