Apologies for such a simple question, but I am renovating a home and my father is installing the drain plumbing. He has a friend who is an architect, and he routinely runs things by him with respect to code issues when doing renovation work. My father also spent a lot of time with an old neighbor who was a plumber and helped him often. Anyhow, dad is claiming that if the toilet is within 5' of the discharge to the 3" main going out to the septic tank, there is no need for a vent???? I have done a lot of internet searches and have yet to find that NOT venting a toilet is acceptable. This and a bathtub drain line are the last two pieces of finishing this work in my home and before I let him back out there to complete this, I need to know 100% that it is installed correctly. Thank you very much to anyone that reads this and offers their knowledge and feedback for me!! I just want things done right.......
Can a toilet ever not be vented?
- Thread starter dingus22
- Start date
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Technically a toilet doesn’t need a vent to function as long as there’s at least one vent in the building or the home is connected to city sewer. It’ll vent itself through a city sewer. Pipe bellies will cause problems…..it stops air flow.
You can’t flush a toilet into an air tight system.
Water displaces air. That air has to go some place.
You can’t flush a toilet into an air tight system.
Water displaces air. That air has to go some place.
twowaxhack....thank you for replying! There is absolutely a vent connected to the 3" main that the toilet is dumping into. I have a 2" main vent through the roof, and it ties into three other vents-one for the laundry, one for the bathroom (same as toilet) vanity drain, and bathtub drain. It appears I may be okay with this??
Probably ok but I’d have to have a detailed drawing to be sure.
I use an iPhone. Nothings coming up in the attachment
arctic bill
Well-Known Member
all toilets need to be vented. before a toilet can flush and drain it has to push the same volume of air out of the way. Your sketch is crap so much wrong i do not know where to begin . get a real plumber or you will be redoing it over and over again.
dingus22, As Twowaxhack said, as long as there is a vent in the house plumbing, a toilet is likely OK.
Re: your sketch, I've seen worse, so don't worry about it.
Bottom line is that air can and will enter the plumbing so your toilet will operate properly. The International Plumbing Code has no limit on how close a toilet vent has to be for a toilet as long as there is one. In your case, air can come down the 2" vent and enter the line from your bathtub, and it can also come down the bath vanity pipe vent as well. So, your toilet is "wet vented" by both of those two lines, and no other vents are required for your toilet.
I can only assume that arctic bill is commenting on the laundry setup, which your sketch seems to show an S-trap instead of a P-trap. But if your dad has been talking to the plumber neighbor, I'm sure it is just the way you tried to show the piping.
Anyway, I think your sketch actually is more of a Picasso, but REALLY not a Rembrandt. LOL!
Re: your sketch, I've seen worse, so don't worry about it.
Bottom line is that air can and will enter the plumbing so your toilet will operate properly. The International Plumbing Code has no limit on how close a toilet vent has to be for a toilet as long as there is one. In your case, air can come down the 2" vent and enter the line from your bathtub, and it can also come down the bath vanity pipe vent as well. So, your toilet is "wet vented" by both of those two lines, and no other vents are required for your toilet.
I can only assume that arctic bill is commenting on the laundry setup, which your sketch seems to show an S-trap instead of a P-trap. But if your dad has been talking to the plumber neighbor, I'm sure it is just the way you tried to show the piping.
Anyway, I think your sketch actually is more of a Picasso, but REALLY not a Rembrandt. LOL!
MicEd69
Thank you for chiming in! I appreciate your review of my situation and your CONSTRUCTIVE comments. Again, I am not a plumber nor a CAD expert, but I believe that my father installed a "p-trap" for the laundry drain and clearly my crude drawing did not indicate that. Nonetheless, don't hold your breath on my sketches hitting the auction block anytime soon, lol.
Are you sure the main vent thru the roof is 2". Most cold climates need a foot of 3" above and below because of freeze issues
fairfieldfanatic
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Can’t drain without a vent. PERIOD.
It may not be directly over the toilet, but it must be somewhere in that node such that volume displacement occurs.
It may not be directly over the toilet, but it must be somewhere in that node such that volume displacement occurs.
If you call being vented the ability of the water to displace air, you’re correct.
All a plumbing fixture needs to drain is displace the air to atmosphere however that may not meet the plumbing code as “ vented “.
Typically vents are in place to protect traps from positive and negative pressures.
Some fixtures need to be protected from the trap siphoning when the fixture is used AND from other fixtures being used and the air the water displaces.
Toilets do not need to be protected from siphoning when the toilet is used. It’s suppose to siphon, it’s an S Trap. It has a mechanical prime in most instances.
So it depends on what your definition of vented is. Plumbing Code book definition or physics definition.
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