Basement Bathroom Venting questions

Hello,

And first I would like to say that I am no expert at plumbing. I did work for a builder for about 4 years though, so I am not new to the house building/remodeling game. But to get to my question:

I am finishing my basement myself, I have pulled all necessary permits, and I want to do things right. I had a builder build the house 5 years ago and I informed him at that time that I wanted to finish the basement with a bathroom. He had the plumber come out and put in the underground plumbing for the bathroom with the intentions of finishing it later. It all passed code then so I should be good to go as far as that part is concerned. When the house was built I also had a ejection pump installed instead of a sump, so that I wouldn't have to go through that mess at a later date.

I have my laundry in the basement as well and there is a vent that comes off this and runs to the roof. My question here is do I need to tie into my vent again for the bathroom or is this one vent enough?

I have attached a rough diagram of the layout as I remember it existing before the basement floor was poured.

Any help or ideas would be appreciated.
Thanks,
Z.

3" vent? 2" vent? 1.5" vent?

how big is the diameter of the vent that you already have?

Laundry+basin+shower+toilet+vanity+drain is a lot of "units". What drains into that last drain? is it a floor drain?

david

The Vent I believe is 1-1/2", but I will have to check to be certain. It may be 2". The Drain is a floor drain by the furnace.

Z.

I checked last night and the vent pipe is 1-1/2". Also I checked upstairs in my master bathroom and I found that the sink drain has what I think is a AAV attached to the drain.

Would I be ok putting one of these in the vanity in the basement? I have my underground inspection for my shower on Monday, so I will ask the inspector at that time what he thinks is acceptable, but I thought I would try to get as much info as possible so that I know what my options might be.

One last thing, geniescience, you mentioned that "Laundry+basin+shower+toilet+vanity+drain is a lot of "units"."; is that if they are all used at the same time this would create a problem, or is a code thing that say you can only have so many "units" attached to a 1-1/2" vent? I am curious, I know that all these units will never be used at the same time and not being an expert on plumbing I have a hard time seeing it make a difference. I could see a problem if all the units were being used at the same time and it creating suction that the vent could not handle.

Once again just curious.

Thanks,
Z.

I see a lot of rough ins like this that only have a single plumbing vent at the opposite end of the pump basin.

My local code requires the sewage basin to be vented directly. In my town, you'd be allowed to loop up the vent behind the wall and tie into the main vent b4 going to attic.

Also, I was required to vent each fixture individually - again, looping up to the main vent. If that's a requirement by yr inspector, then you might be able to get away with aav's on the shower and toilet and sink (you wouldn't be allowed to aav a toilet or shower in my town).

However, I bet the sump basin DEFINITELY requires its own vent. It'll suck so much air, you gotta have an air intake especially since your main vent is so darn far vis-a-vis the other fixtures.

I forgot to mention, the ejection pump (I do not have a sump) does have it's own vent. There is also a vent for the main portion of plumbing for the master and main bath. The sink in the master bath has what I believe is an AAV above the p-trap.

I believe that the vent that ties into he laundry in the basement also serves to vent a 1/2 bath that is directly above the bath that I am putting in. I would be tying into this vent for the basement bathroom. My plumber was pretty good at what he did and I can't believe that he would set this up incorrectly when he knew that I was planning on putting a bath at a later date.

Wow this is getting confusing. I think I just got lost in my own plumbing.......

Z.

Update to Venting Question

Well the inspector was out yesterday and he said that I did not need to vent anything else that way that it was set up. He said tha if the drain was a little slow I could add a AAV at the Vanity to help be more air into the System.

Just thought you all might like to know. Looks like I am all set.

Thanks,

Z.

vents

That inspector must have been a handyman in a previous life. If the lav needs an AAV in the future, then it must not have a proper vent now. And an AAV will not help a slow drain.

Aav

I probably should not have said slow. He indicated that the way in which it was set up I would not need another vent. He then said that I could add an AAV if I thought it was necessary, but he said that "he" would not unless it was necessary. I took that as meaning slow.

Z.