Wet venting through a stack under UPC

[JonBodd]

In the picture below, can the tub/shower and toilet be wet vented through the vanity drain after entering the stack? This is under UPC in CT. Thanks!

 

[Tuttles Revenge]

Looks good until you're exceeding 6ft in total developed length of your wet vent.

UPC toilet vents also need to be 2" throughout.

I think if your 2" vent continued vertically past the point where the sinks tie in you're good. The vertical wet vent would end at that point.

 

[Sponsor]

 

[wwhitney]

This is under UPC in CT.

Connecticut uses the IPC to my understanding.

2021 IPC portion of the 2022 CT State Building Code based on the Plumbing Code, 2021 (IPC 2021)

UpCodes offers a consolidated resource of construction and building code grouped by jurisdiction

up.codes

Under the IPC, the 1-1/2" lavatory dry vent suffices for the bathroom wet vent, no need to upsize it to 2". And the length of the WC "trap arm" is unlimited.

Cheers, Wayne

 

[JonBodd]

Thanks for the info guys. Wayne you're 100% right that CT uses IPC, not sure how I messed that up.

The only thing I haven't been able to clarify from the code is how I measure the 'trap arm' length for the tub/shower in this case. Is it just the length to the drain stack since that's where the wet vent ties in? In that case, would the 2" drain from the vanity be limited to 2" drop, 8' feet of run from the dry vent to the stack to satisfy the trap weir rule?

 

[wwhitney]

Thanks for the info guys. Wayne you're 100% right that CT uses IPC, not sure how I messed that up.

The only thing I haven't been able to clarify from the code is how I measure the 'trap arm' length for the tub/shower in this case. Is it just the length to the drain stack since that's where the wet vent ties in? In that case, would the 2" drain from the vanity be limited to 2" drop, 8' feet of run from the dry vent to the stack to satisfy the trap weir rule?

The trap arm goes from the trap outlet to the vent connection.

For the dry-vented vanity, that vent connection would typically be the san-tee in the wall behind the vanity, if you want the drain to exit the vent takeoff downward. Or it looks like you may want it to stay horizontal, in which case you might use a LT90 at the wall for the trap arm to enter the wall, and then a combo on its back for the vent takeoff (or the IPC would allow a san-tee on its back, but the combo is better if there is space). What the lavatory drain does after the vent takeoff doesn't affect its venting. But the trap arm is limited to one pipe diameter of fall (1-1/2" if you use a 1-1/2" lav trap).

For the shower, the vent connection is that 3x3x3x2 san-tee with side connection on the left side of your picture. So the trap arm between the trap outlet and the 2" side inlet on that san-tee is limited to 2" of fall.

Cheers, Wayne