I'm installing a new bathroom in my basement, the waste eventually needs to go to a septic outlet pipe about 6' off the floor. The plan is to install a sewage basin to accomplish this. I'll have to chip up concrete to get this done. I'll be draining a bar sink, washing machine, lavatory sink, deep sink, and toilet into the basin(I hope:) ). I'm attaching a rough diagram of how I was planning to do this, does this seem reasonable? For the diagram assume I'm using long sweep 90s where I turn, couldn't figure out how to draw them. One concern I have is the clearance to fit a toilet 90 and a wye to the drain pipe since I'll only have 12" clearance to the wall. I apologize for the roughness of the diagram if anything isn't clear, please feel free to ask.

Thanks guys,
Ed

Sorry that pic was bad after I resized it to upload, this one is a little better.

I don't see how you plan to lift your sewage to the pipe 6' of the floor. I also do not see how you plan to vent your drains. Can you walk me htorugh that explanation? In most places you will need a permit, will you?

Hi thanks for the reply, sorry I left some things out here.

The basin I'm planning to get is a zoeller prefab kit with a 1/2 hp sewage pump. So the sewage will be lifted from the basin to my pipe by that pump, going into a wye with a cleanout installed on my existing system.

I also did not include venting, my mistake. The bar sink will be vented by an AAV as I have no other access here. The lavatory sink and deep sink will each have a vent installed at the point where they drop down into the waste pipe. The sewage basin will also have a vent coming out of the top. I also plan to install a vent on the drain line, but I'm not sure if I should put it between the toilet and lavatory or after the bar sink and before the deep sink/lavatory/toilet. All these vents will be tied together and exit up through the first floor/attic and eventually the roof, Im lucky in that I already have a hole for this as there was previously a heating system in this area.

I hope this clears up the pumping/venting, thanks for taking a look.

Ok, so I see from reading other responses that I'll need a separate vent for the sewage basin and the rest of the bathroom. The hole I'm working with is 6", can I run these vents side by side? If so should I make them different heights when they come out of the roof?

can I run these vents side by side? If so should I make them different heights when they come out of the roof? The pit will need it's own dedicated vent an d the system will need to be vented also. The two vents can be brought up side by side with a 6 or 8inch spread.

I also plan to install a vent on the drain line but I'm not sure if I should put it between the toilet and lavatory or after the bar sink and before the deep sink/lavatory/toilet. Every fixture musthave it's own trap and vent. What are you venting with this one? Regards, Tom

Hi Tom,

First of all thanks for the reply and also all the other ones you've given on these subjects, I learned a lot from other posts on this subject already.

My plan right now for vents is:

Vent the bar sink with an aav
Vent the deep sink and washing machine together
Vent the lavatory

So I'm wondering if I need to vent the main drain line so that the toilet would work. It's the last fixture before the basin so I'm not sure if I can just let it wet vent on the other fixtures.

Also, is it OK to tie the washing machine and deep sink together(trying to bust up as little floor as I can). I was going to tee them together under the deep sink. If this is OK should I put a trap in before the washing machine gets to the deep sink?

Does my layout/pipe sizing look OK? Should I tie in differently or set up differently? I don't have to put the basin where it is shown, I tried to place it roughly below the tie in to the main septic line.

Thanks again for the help,
Ed

So I'm wondering if I need to vent the main drain line so that the toilet would work. It's the last fixture before the basin so I'm not sure if I can just let it wet vent on the other fixtures.
In my area your toilet would be wet vented by the lavatory vent and would not need a separate vent. However if you fall under UPC out on the West Coast then you wi;ll have to vent it.

Also, is it OK to tie the washing machine and deep sink together(trying to bust up as little floor as I can). I was going to tee them together under the deep sink. If this is OK should I put a trap in before the washing machine gets to the deep sink?

I can see back ups coming out of your sink with that configuration . Why not install the sdeep sink and discharge your washer into it? Less material to install and the backup concern's all gone.
Your drawing would pass in my area. Good luck and thanks for rating my answer. Tom

First of all thanks for the help I got on the first plan, I have to move my pit a little bit based on distance to a support pole, so I'm also trying to rework and simplify the drains.

This will all be going in my basement with the septic pipe about 6 foot off the floor. Where I have the basin now will be about a 4 foot horizontal run before going up. I plan to use this part for my check valve.

Here is my layout and the second pic is my proposed drain/vent. I really have nowhere to go for the bar sink to vent so that's going to be an AAV. The toilet I will vent a couple feet before. The pump will have a separate vent as well. Both vents will go up to the ceiling then horizontal for about 8 ft then up through the roof. The big change here is two branch lines coming together, before I was trying to do it all as one line and I had so may wyes in a row I didn't think they would fit.

Does this design seem workable? I believe I need the vent for the toilet line because the bar sink is so far away, is that correct? Also should I use 2 or 3 inch for the branch line for the sinks/laundry? I can easily use 3 or even 4 but I didn't know if oversizing would hurt drainage here. Also any recommendations on how to hook up the toilet, should I use a street 90?

Thanks again for all the great info on the site guys, all the help is very much appreciated.

Oh one last question, I was planning on going with a zoeller system with a 267 1/2 hp pump for the basin, any opinions there?

Thanks,
Ed

Oops, sorry I put the wrong pipe diagram on, here is the right one, is it possible for me to delete the 2nd pic in the first post? Sorry guys, here it is.

First of all: I'd like to nominate your post for the " AMHD - Outstanding Drawing" Award of the year ! No kidding...

Anyways: looks good. I would simplify the drains. I would run 3" toilet pipe directly to the pit. Yes, you can use street 90 - but it may bring your plumbing too close to the surface. I think 2" line will be adequate for all the other fixtures - but 3" would be very nice.

See my sketch. The white dots are where vents go up the wall. I don't show vent for the pit, but it need 2" drain too. Yes, I would use AAV for the bar sink. But, if you want to be diligent, you can install bar sink vent at the point where this drain crosses under neath the wall. Combine vents as you described. Here is my sketch showing my proposed drain lay-out:

First of all: I'd like to nominate your post for the " AMHD - Outstanding Drawing" Award of the year ! No kidding...

Anyways: looks good. I would simplify the drains. I would run 3" toilet pipe directly to the pit. Yes, you can use street 90 - but it may bring your plumbing too close to the surface. I think 2" line will be adequate for all the other fixtures - but 3" would be very nice.

See my sketch. The white dots are where vents go up the wall. I don't show vent for the pit, but it need 2" drain too. Yes, I would use AAV for the bar sink. But, if you want to be diligent, you can install bar sink vent at the point where this drain crosses under neath the wall. Combine vents as you described. Here is my sketch showing my proposed drain lay-out:

Milo,

Thanks for taking a look at this for me! The drawing I did was using some free software on the web, heck of a lot better than my first try :)

The other reason I ran the drains this way, and it's not in my diagram, is that on the unfinished side of the basement(where the deep sink and pit will be) I was going to do a wet wall and keep the drain pipe for the deep sink/lavatory sink/washer above ground for most of the run, meaning I would have to break up less concrete. Sorry I forgot to include that information. I don't have room for a wet wall on the finished side as I'm up against cinder block and I was going to just fur it out 1.5" and sheetrock it.

I can definitely do 3" for that drain, I wasn't sure if that was overkill or not, so thanks for clearing that up, I'm going to go with the 3" there.

Thanks!
Ed