wet vent into toilet line

plaza500

plaza500

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hi there

my toilet connects directly to the main 5" cast iron stack via a 3" ABS pipe about 30" long.

my sink drains into a 1.5" ABS pipe that both vents to the attic and down where it wyes into the 3" pipe about 16" downstream from a toilet, and about 12" upstream from the main stack. total run from p trap to drain on sink is about 6'

i used a 3 x 3 x 1.5 wye off the 3" pipe laying on a 45 degree angle pointing up to tie the sink drain in.

is this okay?

thanks
 
plaza500 said:
hi there

my toilet connects directly to the main 5" cast iron stack via a 3" ABS pipe about 30" long.

my sink drains into a 1.5" ABS pipe that both vents to the attic and down where it wyes into the 3" pipe about 16" downstream from a toilet, and about 12" upstream from the main stack. total run from p trap to drain on sink is about 6'

i used a 3 x 3 x 1.5 wye off the 3" pipe laying on a 45 degree angle pointing up to tie the sink drain in.

is this okay?

thanks
Click to expand...
Im trying to imagine your set up.
Works in Canada too.
JUst make sure the WEIR of your p-trap to the vent is not more than 4' 11" and you have a dry vent for your toilet between the 3x3x1.5 Y and your toilet bend., otherwise your 3x3x1.5Y will have to change to a 3x3x2 Y to wet vent the toilet
 
drain

IF I follow your description properly, and that is not always a given, it will work anywhere, except where the toilet vent has to be 2", (which is a lot of, if not most, places).
 
okay thanks - however there is no vent off the toilet line, i thought since it was only about 2.5 feet from the toilet to the main stack that it didn;t need to be vented?
 
plaza500 said:
okay thanks - however there is no vent off the toilet line, i thought since it was only about 2.5 feet from the toilet to the main stack that it didn;t need to be vented?
Click to expand...

It needs to be vented (or wet vented) because you are placing the 3x3x11/2 Y on the same leg as the toilet. If you place the Y on the verticle stack below your toilet sani-T, you do not need to vent the toilet. It becomes stack vented because of the short distance.

If your Y was a 3x3x2 , run the 2" up to the sink sani-T, The toilet now becomes WET VENTED. no other vents required.
 

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hmmm i installed it as you drew on the right, however the part of the line you say to run 2" i only ran 1.5"

will this cause issues?
 
I think up until 2005NPC release you could get away with 1 1/2 but now it has to be 2" for wet vent serving any water closets.
 
plaza500 said:
hmmm i installed it as you drew on the right, however the part of the line you say to run 2" i only ran 1.5"

will this cause issues?
Click to expand...

It will work, but will not pass inspection in any juresdiction . The drawing on the right shows the toilet being wet vented by the sink drain. The drawing on the left has an independent drain for the sink and a dry vent for the WC
 
Yes the wet vented portion must be min of 2" if you're serving a water closet. So Plaza500 the 1.5" portion of your wet vent isn't code compliant and should be redone. Not for the code sake but for the functionality of your DWV system.
 
hmmm.... now the toilet is only a short distance of like i said 30 inches or so, and that goes right into the main stack. the main stack vents right above where the toilet goes in as the house is a cape cod and the roof line is low - the bathroom is a shed dormer.

the sink is about a 5' run vented at it's source

what effect on the functionality of the system would i see?
 
plaza500 said:
what effect on the functionality of the system would i see?
Click to expand...
There is a difference in opinions when it comes to the bottom line.

In my opinion, the worst that can happen in the set up that you already have is, everytime you flush the toilet, you run the risk of syphoning the water out of the p-trap at the sink. Or the sink may syphone water out of the toilet. I'm not going to say that it will happen, but rather, it may happen.
 
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