Bathroom Remodel, Drain System, 1 sink to 2

[jzolnoski]

Hello, new to the forum. I've started my primary bathroom remodel and I have a question and looking for advice regarding vanity drain system. We are going to be putting two sinks where there was one. I have included a photo of the existing layout and an overlay of what I think I need to install. The existing drain from the vanity is 2" PVC. It's currently in the outside wall, along with the supply lines. We're located in SE Michigan, and in 26 yrs we have only had the supply freeze about 3-4 times. Actual temps were in the negative, and it only lasted a day. (enough history). My plan was to move everything to the floor space and come up thru the bottom of the vanities. I believe the wye can be used on it's side as well as the long 90°. These allow me to slope the right and left runs properly. Plan it a 2"x2"x1½" wye, a 2"long 90° with a 1½ reducer. Then I can run the left and right legs with 1½. After that, 45° or 90° to turn vertical. Additional note, there is no vent (as seen in the photo). The old drain had a Studor valve, and I am planning to install one for each sink's drain. Thank you for any and all advice or suggestions.

 

[Sylvan]

where is the vent for the drain ???

 

[Sponsor]

 

[Sylvan]

Where is the vent for the drain ???

 

[Reach4]

Presumably the lavatory is dry vented.

You must join the lavatory drainage with the toilet drainage before joining the drainage from that vertical 3-inch drain pipe. This presumes the vertical pipe carries drainage.

Then if the path from the toilet to joining the lavatory drainage is not more than 6 ft (UPC), then venting should be good.

If longer, join closer to the toilet.

Any drainage 90 bend should be a long sweep or two 45s.

I think where BC joins AL via 45 at B, I think that should be from above. Find out what restrictions there are on the angle of BC.
The wye at A is horizontal.

Is H to supply a potential bidet attachment that has both a hot and cold input, such as https://www.homedepot.com/p/Brondel...re-Bidet-Attachment-in-White-FSR-25/316820295 ?