Oh wow glad I asked this question. Im not sure how they expect a home owner to run a vent pipe from the basement to the attic without tearing out drywall above. I'd rather not have to use the aav but not sure any choices.The basic answer is you can't tie your basement bathroom vent in there.
That 1-1/2" pipe segment is a vent for the two fixtures on the floor above coming in at the two san-tees (bathtub and shower?). So that vent can't combine with any other vent lower than 6" above the flood rim of those fixtures. You'd need to run your new vent alongside and parallel to that vent, then in the story above when you are high enough, you can combine your two vents.
Or, since you said in your other thread that you are under the IPC, you could consider an AAV for venting the basement bathroom.
Cheers, Wayne
Yea they took the easy way out. I talked to my inspector and they won’t allow me to do the AAV since a toilet is involved. I now have to tear out drywall in the master bedroom to access that vent pipe. Wife is not to happy.I think you mentioned in the other thread that the builder roughed in the basement drains? So if the builder didn't rough in a vent in the ceiling, then they took the easy route of expecting you to use an AAV (since you are under the IPC and that is allowed).
But I thought in the other thread you mentioned some work you're doing on those drains above. Opening up the drywall on that wall isn't a part of that job?
Cheers, Wayne
I suggest getting a hold of a copy of the plumbing code in force in your area, up.codes doesn't cover Missouri, saying that it varies by municipality. If it is based on the IPC, then they would have had to explicitly amend section IPC 918 to cover what the inspector is saying. If they haven't amended that section, then the inspector can't impose that requirement, and you should be able to use an AAV.I talked to my inspector and they won’t allow me to do the AAV since a toilet is involved.
Yea he specifically told me he wouldn’t allow it, but I want to do it the best way so here we go. Just to make sure I need to be how many inches above the lowest drain on the first floor.? I assume go 4 inches above the p trap in the sink. Also when I tie into that existing vent would I just use a regular t or a santee? And ok to use 1.5 for the vent or do I need 2 inch. Thank you!!I suggest getting a hold of a copy of the plumbing code in force in your area, up.codes doesn't cover Missouri, saying that it varies by municipality. If it is based on the IPC, then they would have had to explicitly amend section IPC 918 to cover what the inspector is saying. If they haven't amended that section, then the inspector can't impose that requirement, and you should be able to use an AAV.
Here's the unamended version, FWIW. There are no exclusions for WCs.
https://up.codes/viewer/colorado/ipc-2018/chapter/9/vents#918
Cheers, Wayne
P.S. If their really is a local amendment, then the builder should have known that and provided a rough-in vent. So if you are within your builder warranty, you could go after the builder.
My point is that it's not up to the inspector to allow or disallow, what matters is the written code adopted by your jurisdiction. So that's why I'm suggesting checking what the written code says about AAVs. The inspector should be saying "IPC 918.blah disallows it" where 918.blah is a local amendment, not "I won't allow it."Yea he specifically told me he wouldn’t allow it
Well I think I lucked out. I was about to start cutting drywall out when I realized the vent pipe I was going to tie into was actually behind the shower wall. I went to the attic and saw where all the venting came together. I found this pipe in the basement close to the bathroom rough in above the duct work. Is there a way to prove this is for vent? I am thinking that has to be for venting.My point is that it's not up to the inspector to allow or disallow, what matters is the written code adopted by your jurisdiction. So that's why I'm suggesting checking what the written code says about AAVs. The inspector should be saying "IPC 918.blah disallows it" where 918.blah is a local amendment, not "I won't allow it."
When two vents join, it needs to be at an elevation at least 6" above the flood rim of any of the fixtures being vented. So above the p-trap is not enough, if it's the highest fixture involved is a sink in a 36" high counter, it would need to be at least 42" above the floor. You can join vents with any 3 opening fitting you like, wye, san-tee, vent tee, combo (unusual), etc.
Cheers, Wayne
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