Hi , Putting a new basement bathroom with ejector pump and a complete novice at this so need some help. I will be jack hammering for plumbing next week, need to know if my plumbing is going to work properly. Attached is the pic to get you guys an idea of what I have in mind.

My question is with regards to venting. Can anyone tell me if my proposed venting line is going to work. The parallel white lines are actually vertical lines that I will tie to the vent stack upstairs.


Thanks

Hi Samsolong

You are close, but a little off with a fitting or two and how to vent this system. Check to see if WET Venting is allowed in your area. If wet venting is allowed then you can pipe this up as I have drawn it below.

You will be using the 2" SINK drain and vent to "wet vent" the toilet. The shower drain gets its own vent and the washing machine drain does as well. Bring all waste and vent pipes out of the ground 2" and then you can reduce to 1.5" for the shower vent and the washer vent. Connect all these to the 2" sink vent and run 2" from up and through the roof (or connect to a 2" or larger vent upstairs at a minimum of 42" of the finish floor).

Some notes:

You MUST install the wye fitting for the sink (off the toilet drain line) so it rolls above the center line of the toilet drain...use 22.5 degree fitting to straighten out and run pipe straight.

You cannot use sanitary tee fittings underground (must be wye, wye and 1/8th bend or a combination wye/1/8th as in your picture).

Install cleanouts on all pipes that come out of the ground.

Invert fittings for the vents so rain water and condensation that comes in from the roof vent will drain by gravity to the drains. Vents pitch at 1/4" per foot back to the drains.

Finally, don't forget that the bathroom vent cannot connect into the sewage ejector vent. In most states, sewage ejectors have a dedicated vent up and through the roof...do not connect into this pipe unless allowed and if so, the connection will probably only be allowed in the attic about 12" below a new or existing roof vent penetration.

Questions? Let me know, OK?

Mark

Attached Images

 

Mark,
Your illustration is very clear and helpful, thanks! Now a couple questions.
Attachment 46723

You say
" You MUST install the wye fitting for the sink (off the toilet drain line) so it rolls above the center line of the toilet drain...use 22.5 degree fitting to straighten out and run pipe straight."


So you suggest I use a Wye like so #2?

Change the sanitary Tee to like the fitting # 1?

Thanks again!

Hi Samsolong

The attachment could not load up... please try posting again UNLESS I answer your question below:

No sanitary tee, for sure. For the sink drain (which is a wet vent for the toilet), use a regular 3"x2" wye and a street 45 and slightly roll the wye above the center line of the drain using the street 45 to straighten your drain/vent out to run over to the sink. You could also use a 22.5 degree fitting or two in the 3"x2" wye if you want. The idea here is to get the wye above the center of the drain line so it acts as a vent and not as a drain (even though it is a sink drain it is acting as a toilet vent as well).

Make sense?

Mark

Mark, is this what you have in mind?
Attachment 46727
Also, since I am so close to the ejector pit, can I just siphon the washer straight into the pit by drilling a hole and sealing it! It will save me some time and work, would you recommend ?

Thanks You!