Bends in Trap Arms (Specifically Toilets)

[Aaron_808]

Hello again,

I am told that I can have a 90º bend in a trap arm. Does the 4x3 closet elbow already count as 90º?

I would like to put a 22.5º horizontal bend in my 5.5' toilet trap arm to line things up. It will vent via a 3x2 wye laying on its back. This is in a crawlspace but there isn't much vertical clearance so it is being run as if it were under a slab (no vertical pipes to change angles with).

Will this count as a 22.5º trap arm bend or does it add up to a 112.5º bend because it already has an elbow?

Thank you!
-Aaron

 

[Reach4]

The trap of a toilet is in the toilet. You have no trap arm as such. You don't need to provide any horizontal if you don't want.

 

[Sponsor]

 

[wwhitney]

The relevant section of the UPC is 1002.3:

https://up.codes/viewer/california/ca-plumbing-code-2019/chapter/10/traps-and-interceptors#1002.3

For a 3" trap arm (as on a toilet), it allows 135 degrees of bend without a cleanout. So even if the closet bend counts, you'd be fine.

[Per the UPC definition of "trap arm", toilets have trap arms, too. They are just exempt from the trap weir rule because they are intentionally siphoning fixtures.]

Cheers, Wayne

 

[Aaron_808]

Well then, I guess that answers that. Thank you very much!