S-Trap or P-Trap

[Robert J. OConnor]

I agree with Charles that the trap arm length looks a little too short ... must be at least 2 x Pipe Dia from the trap wier (bottom of elbow going back) to the vent/stack (even if the vent is an AAV).

JMO & 2-Nickels ...

[rmoore]

On the trap arm length...

UPC says minimum 2 x diameter, IRC says minimumc 8"...but that is in a section referring to traps with a vertical leg, (P3105.3) and I'm not sure if it really applies to all trap arms.

Joe...the AAV prevents siphoning the same as if that upper vertical section extended all the way through the roof. It just doesn't vent the gases back into the cabinet.

To my eye it looks like we have that 2 times...albeit barely. I'd say that according to the UPC there is nothing wrong with the set-up. The IRC may require a longer trap arm, but I wouldn't get very excited about it.

[rmoore]

Going back to the trap arm length as per the IRC...

I'm going by the 2000 version (yes, I know I need to update), but the only place I find the trap arm length mentioned is in the P3105.3 Vertical leg for waste fixture drains section. That's where it says 8". I can't believe you are supposed to read that section to determine trap arm length for normally trapped fixtures. Am I missing something?

[John Clayton]

Read the next section Richard, It is covered in 3105.4.

When a trap is located within two pipe diameters of the vent it is considered to be crown vented, which is prohibited.

[rmoore]

Thanks John...right under my nose. Presbyopia can be a *****.

[Jay Moge]

Originally Posted by rmoore

Thanks John...right under my nose. Presbyopia can be a *****.

that sound like one of those medical condition i got a shot for when i went overseas, i should be safe right?

[rmoore]

Stay away from sneezing chickens and you should be OK Jay.

[Jay Moge]

Originally Posted by rmoore

Stay away from sneezing chickens and you should be OK Jay.

got it...thanx.......that was a close one.