1st Time Plumbing Rough In Questions

[Dirtworker]

Never done any plumbing and looking for some guidance on my first DIY plumbing project. Putting a new bathroom in my attached garage bonus room on the second floor. Attached is a plan view and a cross section for how I think the drain rough in might be done. I have the sink drain attaching directly to the vertical stack with a sanitary reducing tee(2"x2"x1-1/2") and I'm wondering if I can use the 2" sink drain line as as vent line for the toilet or do I need to run another vent line from a location between the toilet and 3"x 2" wye to the 2" sink vent and connect it above the sink level? It seems like I want a cleanout at the end of the 2" line and also on the 1st floor after the vertical transitions to horizontal. Can the toilet function as a cleanout point for the 3" waste line or does that need it's own cleanout? Also, if I can use the sink drain as a vent, do I connect to the 3" toilet line with a wye rolled up (as shown) or with a T that has the 2" line entering the 3" on top of the 3" pipe? Thank you for any help anyone can offer.

 

[Terry]

That works for me.
The 2" through the roof vents the toilet and the lav.
The lav drains into the 3" line with a wye fitting. A combo is a wye and and a 45 together.
On the vertical, the santee is the correct fitting. 2" x 1.5" santee. That's 2" on the top and bottom, 1.5" on the side.

 

[Sponsor]

 

[Dirtworker]

Thanks for the quick reply. Is it ok to just roll that 3x2 wye up and use a small angle bend to drop the 2" into the 3" or does that need a T?

 

[Terry]

The 3 x 2 should be a wye. You can roll it.