What size drain pipe do I need?

[38ppBBia]

I have a kitchen and bathroom that share a wall. When I opened it up I found 1.25" drains in the wall (both the kitchen sink and bathroom sink use the same drain. Should I bump this up to 1.5" or 2" before it hits the main drain pipe? Thanks.

 

[Terry]

The kitchen sink needs 2" and a 2" cleanout.
The trap and the vent can be 1.5"

 

[Sponsor]

 

[38ppBBia]

The kitchen sink needs 2" and a 2" cleanout.
The trap and the vent can be 1.5"

There is currently no clean out, and thererreally isn't a spot to put one, unless it's on the horizontal drain going to the main stack (this also includes the bathroom sink). Would this work?

 

[Terry]

A cleanout on the horizontal is often done.

 

[38ppBBia]

A cleanout on the horizontal is often done.

Ok, thank you for explaining. Just so I'm clear on my situation, the horizontal drain coming from the wall goes between joists in the basement ceiling, so I can't put the cleanout facing up. Should I put it sideways or facing down? Thanks.

 

[Terry]

I'm a little confused, but they do want a cleanout that is accessed in the sink cabinet. Is your p-trap in the cabinet? Or below the floor? Gee, I hope not.

 

[Reach4]

Just so I'm clear on my situation, the horizontal drain coming from the wall goes between joists in the basement ceiling, so I can't put the cleanout facing up.

It is not clear how a horizontal drain can come from the wall. Consider adding a sketch. Maybe you mean the vertical pipe below the sanitary tee turns horizontal in the basement? The turn from vertical to horizontal is the common place for a kitchen drain line to clog. That needs to be a long sweep elbow or two 45s unless you are adding in a cleanout there with a combo.

Should I put it sideways or facing down?

I think a cleanout needs to be accessible and usable. I am not a plumber.

 

[38ppBBia]

I'm not explaining well. I can create a diagram later. Could I just do a 2" p-trap with a cleanout in the p-trap?

 

[Reach4]

I'm not explaining well. I can create a diagram later. Could I just do a 2" p-trap with a cleanout in the p-trap?

I think that if you use a slip p-trap, that can be disassembled to provide a cleanout. So a little cleanout plug at the bottom of the trap doesn't really provide anything useful I think.

I don't think it is a good idea to use a glued p-trap in a home kitchen.

 

[38ppBBia]

Thanks for the replies. This should better illustrate what I'm trying to figure out. Basically, there's no room in the wall for a cleanout, and the horizontal run is up against the joists.