Roughing in a toilet

[Branimal]

I’ve got to rough in two toilets for side by side bathrooms.

Do I need to use closet bends? Seems like the closet bends would make my life easier. I think they are called long quarter bends in charlottes cast iron product literature. See pic.

I was messing around with some spare fittings and setup a run with a couple elbows and a wye. See pic. But it seems the closet bends would be better suited for the job. Wider turn radius.

 

[hj]

You CANNOT connect the two toilets that way. There have to be individual vents for each one if you install it that way.

 

[Sponsor]

 

[Branimal]

Can I use closet bends and modify my install as per the attached diagram? Option #1

Is possible to not vent the toilets if the soil/vent stack (dry) is 110” of the furtherest toilet? I’ve read that a vent must be 12’ from a 4” trap. I’m assuming the toilet has a 4” trap.

Or would venting at each toilet be more efficient? Option #2

Should horizontal toilet drain lines run 1/8” or 1/4” slope? Or is somewhere in between ideal?

 

[hj]

I would use option #3. Install the riser between them. Use a "back to back fixture fitting" parallel to the wall then "offset" the closet openings to the proper locations. Maybe with a cleanout above it. With option #1, you CANNOT flush one toilet past the opening for the other one.