I am planning on finsishing my basement this year complete with a kitchen and a bathroom. Of course the sewer line is 3ft above the floor. I figured that I would use the Little Giant sewer ejection system. By what is advertised on the site is that the Little Giant system should be able to handle the toilet, shower, bathroom sink and the kitchen sink drain. My question is about venting all of the drains.
1- Do I still have to vent the toilet since the ejector system has a vent? (I think the answer to this is yes)
2- So if I must vent the toilet in a 3" pipe to the roof can I tie the shower, bathroom sink and kitchen sink into that 3" vent?
3- Could I run the 3" vent to the attic then turn it to tie into the existing 3" vent? (about 20ft away)
4- Could I just use a studor valve on the sinks and shower?
5- Can anyone show me some pics or a diagram of what the plumbing and vents should look like for this type of installation?

Simply put the plumbing has started to turn into a nightmare, I am trying to do this myself without cutting anymore holes than necessary through the 2nd floor and the roof. If anyone can help me out I would greatly appreciate it.

Thanks,

James

Hi James:

1) Yes... all fixtures need to be vented and all these evnts connect together and join the rest of the venting system in the home. The sewage ejector vent needs to go up and penetrate the roof without connecting into the regular plumbing vent system.

2) If WET VENTING is allowed in your area you can connect the shower and the sink drain into the 2" vent coming off the 3" toilet drain. Here, the sink vent (must remain 2" until connects into 2" or larger vent upstairs) acts as an individual vent for itself but also acts as a wet vent for the toilet and the shower. Run a separate 2" line for the kitchen sink and connect the 1.5" vent into the toilet vent at a minimum of 48" off the finish floor. The washer drain is 2" and needs an 1.5" vent at a minimum also and should connect into the kitchen sink vent or the toilet vent... whichever is closer.

3) YES

4) Nope... see if wet venting is allowed. If not, then if possible run individual vents for all fixtures. If you do install studor vents be sure to leave them accessible as they can fail in the future.

5) YUP... Here's an older version to start you thinking. I will pop back later tonight and see if I can post up a couple more pics I have in my library.

I'm off for now... let me know what you think to this point.

MARK

That kind of sucks that I have to keep the sewage ejector vent by itself, I was really hoping I could have tied it all in on the same vent.

Now I have a few more questions.
1- The kitchen sink is about 18ft away from where I am planning on running the vent pipe. Is this too far to run the vent? (This is where I was considering a studor valve)
2- Should I just plan out the kitchen in a new location closer to the vent?
3- When I get the vent to the attic the closest vent line is going to be approx 15-20ft away either way I go, is this too far to go to tap into the other vent or should I just quit complaining and cut the hole in the roof already?
4- I know you said that I couldn't tie the ejector vent into any other line in the house but If the ejector vent is going to be running right next to the other vent line once I get it in the attic couldn't I just connect them together and run it out the roof as one? (I have a feeling that the answer is no, but it makes such perfect sense to me):D

I have to check the codes to see if wet venting is allowed or not, I think it may be against local codes here because I know that nothing in this house is wet vented. I think that is all of the new questions I have. These vent lines are killing me.

Check on wet venting and studor vent acceptance... let me know.

No problem on vent distance for kitchen sink.

You can connect into the existing vent system in attic even if 15 feet away.

I have attached a diagram showing how to wet vent bathroom setup and how to pipe the kitchen and washing machine separately... see image.

Some inspectors will allow you to connect the ejector vent into the sewer system vent when you get to the attic... but most won't... so up to you and the inspector... ;)

PS... all vents pitch back toward drain system so that any rain water that enters the system can drain back to the sewer by gravity.

Keep me posted as you go...

MARK