No, I am saying that in your touched up drawing, the only legal one under IPC is the stack vent setup.
Now, if you were to drain a lavatory through that vent, all three arrangements would be OK.
A toilet is a fixture that, by it's very design, will siphon the trap when it is flushed. It doesn't matter how you vent it, a toilet that is operating properly will siphon it's own trap. It has a refill tube coming off of the fill valve to add water back to the trap. The only reason a toilet needs a vent is to prevent other fixtures from siphoning or blowing out the toilet trap.this wet vented, under ips is legal ?
I do not understand, a combo, in the vertical, is not to be used because the vent is cut off by the wye...
do you know the rational behind it being legal?
A toilet is a fixture that, by it's very design, will siphon the trap when it is flushed. It doesn't matter how you vent it, a toilet that is operating properly will siphon it's own trap. It has a refill tube coming off of the fill valve to add water back to the trap. The only reason a toilet needs a vent is to prevent other fixtures from siphoning or blowing out the toilet trap.
What I think you are considering is when the vertical pipe (in this case the toilet riser, and never mind that a toilet riser can't be a vent) is the vent, you can't use a wye and 1/8 bend because the drop in the combination will allow the vent to be choked off. Theoretically.
Edit: If I understand your point correctly, my answer would be that the lavatory drain is already drawing air from the vent that is connected to it, so therefore it won't siphon the toilet trap.
well, that configeration, on a 2 story house, would be a hellofa easier to put in, on a outside wall. you would not have to hog out a bunch of wood on the rim joist.
if you come across an old ipc book let me know. i need to read up on that code.
So say I wanted to put just a toilet in my garage and that's it. Main sewer is aprox 25' away, ideally I wouldn't need to place a vent on that line since it's not limited and there's a. Vent on the house. Or does a vent need to be within at least 10' of toilet?
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