Wayne Whitney wrote:

Hello,

In preparing a bathroom remodel in California, I have a few questions
on the toilet rough-in that I didn't find answers to in my intro
plumbing books or searching the archives. Any help would be very
appreciated. I will of course check with my inspector for the final
say, but I would like to be a little more knowledgeable before I
approach her.

Cheers,
Wayne

1) I'm going to be using ABS for the DWV. What are the pros and cons
of a solid ABS toilet flange versus one with a metal flange?

2) Should the top of the toilet flange be flush with the finish floor,
or 1/4" higher? I've heard both.

3) Does the use of a sanitary cross to connect two toilets to a soil
stack force the soil stack to be 4" in diameter? If so, should I
just make the toilet drains 4"?

4) Every diagram I have seen shows a closet bend right beneath the
toilet flange. Can it be lower? I'd like to drop below some 2x10
floor joists, as I have plenty of altitude and room in the crawl
space.

5) For that matter, is using a closet bend a requirement, or is it
just a convenience? I can imagine using a 45 degree bend and a Y
connection.

You better run all this past the inspector, esp. Calif.

In general, using a closet bend and entering the stack with
a San TEE (rather than a WYE) eliminates the necessity for
a vent connection to the closet (no fixtures above).

If you're doing back-to-back closets (San Cross), the stack
may need to be *at least* one size bigger than the branches.
They may not permit a cross here at all. That will mean
2 separate WYE's or TEE-WYE's, each with it's own vent connection.

YMMV, ask first...
Jim