4 inch Sanitary Tee with 2 inch side inlet

[DSH135]

When are you permitted to use a Sanitary Tee with a side inlet? I was considering using the 2 inch inlet on a 4x4x4x2 Single Sanitary Tee for the waste line from a shower/tub combo that is to the right of the main stack. Above this Sanitary T is the 4 inch vent that goes to the roof. This would be the easiest and shortest run from the shower for me.

The other options I was considering were as follows: 1) use a 4x4x4x4 double sanitary tee and reducing the opposing branch with a 4x2 reducer. or 2) putting a second 4x4x2 single sanitary tee further down the stack and letting the shower waste enter here.

 

[frodo]

depends on what the tee is catching?

 

[DSH135]

The 4 inch horizontal branch from the T is carrying waste from 2 toilets, a shower, and 2 bathroom sinks.

 

[Mr_David]

When are you permitted to use a Sanitary Tee with a side inlet? I was considering using the 2 inch inlet on a 4x4x4x2 Single Sanitary Tee for the waste line from a shower/tub combo that is to the right of the main stack. Above this Sanitary T is the 4 inch vent that goes to the roof. This would be the easiest and shortest run from the shower for me.

The other options I was considering were as follows: 1) use a 4x4x4x4 double sanitary tee and reducing the opposing branch with a 4x2 reducer. or 2) putting a second 4x4x2 single sanitary tee further down the stack and letting the shower waste enter here.

2 toilets, a shower, and 2 bathroom sinks are already connected to the stack ?

Is the 4" to roof going to be the vent for the shower/tub. If so then use a separate santé for the T/S. if the T/S has it/s own vent than better to add a 4 X 2 wye below existing tee instead of a santee But the T/S will be wet vented if below the lateral from other fixtures .
If Tee from 2 toilets, a shower, and 2 bathroom sinks not connected yet best to use a wye. Or you can use a double fixture tee for both connections, NOT a Santee

 

[DSH135]

Thank you for the response. I should have stated up front that the layout of the house is less than optimal. I have a mix of cast iron, galvanized, and PVC, and I am working to correct several plumbing mistakes (several San-Ts on their backs/sides, a vent that goes down then up, etc). Here are the answers to your questions:
"2 toilets, a shower, and 2 bathroom sinks are already connected to the stack ?" yes, they tie into two 3 inch horizontal runs below the second floor joists that separately drop into the 4 inch stack; both via 45/Wye combinations. There are two additional separate vents between the two upstairs bathrooms.

"Is the 4" to roof going to be the vent for the shower/tub. If so then use a separate santé for the T/S. if the T/S has it/s own vent than better to add a 4 X 2 wye below existing tee instead of a santee But the T/S will be wet vented if below the lateral from other fixtures ."

yes, the 4 inch vent to the roof will be the vent for the T/S. I want to wet vent. The T/S is very close to the stack, so it is a short run and I do not expect an issue with siphoning out the trap. I do not have the ability to tie back into the dry vent high enough up without tearing a bedroom wall apart.

"If Tee from 2 toilets, a shower, and 2 bathroom sinks not connected yet best to use a wye. Or you can use a double fixture tee for both connections, NOT a Santee"
Question for you: I thought going from Horizontal to Vertical requires a San-T or a medium sweep elbow . I thought Wyes were for other transitions? Forgive the ignorance, I am not a plumber by trade. I am just trying to understand your recommendation for a wye.

 

[frodo]

read this, 706.2 it might help you out.

 

[Mr_David]

If you ever had to cable the drain the wye is a more direction fitting. cable will go down. water and waste will flow better down wye than a santee.

If you use a double santee a cable will pass though to other horizontal line before it goes down.

If you use you 4" for vent then use the santee for trap arm, but trap arm should be horizontal from p-trap to santee

 

[frodo]

IF...you install the 4x4x4x2 side outlet tee and there is NOTHING else installed above in. yes, you can use that waste stack

it would be the same as a multi story waste stack'' see drawng