Kitchen Plumbing Questions

[pbj]

Hello.

I'm starting a kitchen remodel and looking for a little help on the drain. We have removed a kitchen half wall/bar and re-routing the drain to the back wall.

In the picture. In green are the locations of the old drain from the half wall and where I need the new drain to be located. I am utilizing the old vent and bringing it through the studs in the back wall. Planning to connect to a sanitary tee ~14" from the floor. Then the drain would go horizontal about 3'. (in red). Then connect to a long sweep 90 and then back to the drain from the prior plumbing.

My real question is whether I need a long sweep 90 for the first 3' horizontal run. I would do that but I cannot keep 1/4" slope due to a floor joist directly under that back wall. I can keep 1/4" with a standard 90.

I am having a hard time finding a definitive answer on whether a long sweep 90 is required in all situations. My prior plumbing did NOT have one. Apologies if this has been answered on prior questions. Any help would be appreciated. I will be installing a garbage disposal if that helps the discussion.

thanks for any advice.

 

[Terry]

From vertical to horizontal a long sweep 90 or two 45's
Horizontal to horizontal a long 90
From horizontal to vertical a medium 90 is fine.
The revent is six inches above the flood level of the sink, 42"
You need a 2" cleanout for the sink which can have a 1.5" trap and arm

I've seen some use medium 90 where I would not. You don't have to show me pictures.
You can though.

 

[Sponsor]

 

[pbj]

From vertical to horizontal a long sweep 90 or two 45's
Horizontal to horizontal a long 90
From horizontal to vertical a medium 90 is fine.
The revent is six inches above the flood level of the sink, 42"
You need a 2" cleanout for the sink which can have a 1.5" trap and arm

I've seen some use medium 90 where I would not. You don't have to show me pictures.
You can though.

Very cool! Thank you. I think I can get those 45s to work. Really trying to keep everything in the wall since the last conig was a cluster F!

So basically this?

https://www.finehomebuilding.com/ap...mebuilding/departments/021181bs116-01_xlg.jpg