Toilet drain under slab in Chicago burbs

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Kevin71246

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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!!!
 
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Kevin71246

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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")
 

Kevin71246

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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

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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

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"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

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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.
 

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hj

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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

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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?
 
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