Toilet drain under slab in Chicago burbs

[Kevin71246]

Im in suburbs but we go by chicago plumbing code. Im roughing in plumbing for a bsmt bathroom. Is a 3" PVC toilet drain pipe under the concrete slab for a toilet code in Chicago or is 4" required? Or 3" only ok for a max distance? I'm only going about 4' but would like to know if distance determines this.

(BTW I know a 2" drain line is the minimum that can be buried under a slab in Chicago, like for a tub - instead of 1.5". So wondered if a toilet is the same where you have to go with the larger size.)

Thanks All & LOVE the forum!!!

 

[Terry]

3" is fine for a toilet.
We only need to go to 4" when it's the forth toilet added.

 

[Sponsor]

 

[Kevin71246]

3" is fine for a toilet.
We only need to go to 4" when it's the forth toilet added.

Thank you! I know Chicago is the most anal! . Ejector pit came with a 4" hole already cut... Should I adapter to 4" at the pit so the grommet that came with it fits? (Else there will be a gap with the 3")

 

[Terry]

If the pit has a 4" going in, you need to fill it. You can then bush down.

 

[Reach4]

Ejector pit came with a 4" hole already cut

Your pit should have a real 2 inch vent to the roof.

 

[Kevin71246]

Appreciate the replies...you guys are the best! Im doing a 2" dry vent to the roof as read somewhere on this forum. Yes, the pit has 2 2" holes on top as well for drain & vent.

 

[Terry]

You need to vent the pump basin, and the plumbing will need venting before it enters the pit.
The discharge gets a check valve and a shutoff so that you can pull the pump for replacements.

 

[Kevin71246]

"The venting before it enters the pit"...is a 2" WET vent ok? In order, I have toilet, 2" coming out of ground for sink from wye, that goes up to roof, and toilet then continues to pit. Then of course pit has a 2" vent from lid that goes to roof.

 

[Kevin71246]

Ignore the elbows on top (to prevent crap falling in). But u can see pit (left under buckets) which will have vent & discharge at lid, 2" sink vertical stub out (that will tie in to ejector vent & continue & vent to roof), & shower at right.

 

[hj]

You forgot to mention you had a tub/shower drain connected to the toilet drain BEFORE the vent. That does NOT work, unless the smaller drain also is separately vented.

 

[Kevin71246]

I thought you could connect a shower drain without it's own vent if it's within X feet of another vent. Is this not correct?