Sewer relocation...above slab?

[eag379]

Hey all, I have a kitchen remodel issue that I've been surfing around the website and can't seem to solve (for sure.)

Relocating sink in new kitchen island. Old island footing was the somewhat small horseshoe of clean gray concrete. New island footing will be where the crude marking in black marker has been made! New sewer location where be where the tape measure is, about 5 foot away from the current drain. Current drain is 13" above the slab, the cleanout is 20" above.

I can put the drain where the tape measure is 13" above ground, so long as I cut out and T into the existing drain line around 11" above the ground, correct? This is 2" of slope over just 5 feet so it's plenty, correct? Is there a more idea slope? Kitchen sink, garbage disposal, dishwasher, etc is on this line.

I am also admittedly ignorant and curious, the current 'loop' is simply the air vent (one is air, the other is my drain), correct?

For once the electrical in the project is the easy part. Thanks guys.
Ethan

 

[frodo]

....................

 

[eag379]

Sorry about that, Nevada! Not that it matters but Las Vegas specifically. 2006 home built to code at that time and hopefully done right as building inspections were pretty easy to pass from the curb back then. Love the HD comment, glad to hear they are as dumb in your area as they are out here. Not what they were 10 years ago.

Thanks for the quick response, sounds like I should be ok to do the relocation without cutting into the foundation. Small note, the sink/cabs will be on the other side; the sink you drew will actually be open area (standing area, chairs, etc.) So, while I'd rather not, it seems I'll have to run the sewer inside the island frame wall and do a 90 around that corner...unless you think that 90 might be a problem?

If I truly spoke HD I would simply arrogantly put it together without looking into it first and send myself on my way.

 

[KnarlyCarl]

Well I think you can get away with running the drain from the existing where the tee is now, but keep it on the same vertical pipe as it is now, don't put the tee on the other vertical pipe. Obviously you will need to get around the other vertical pipe because it looks to be directly in the way if you bring the new pipe that way. Keep it at 1/4" per foot fall and you will be good. I believe the same length rule would apply to this where you are allowed 6' horizontal run away from the vent for 1-1/2" pipe

 

[frodo]

is a double wall possible ? if not, you will have to bust concrete

the way the pipe sits now, the vent,is in the way,

 

[eag379]

Hey, thanks Knarly & Frodo!

You know, that 1/4" per foot rule...is there a more ideal slope that you guys have learned about thru practice? Looks like I have plenty to work with here, and if you've found say 1/2" per foot (or whatever) to provide better drainage, I don't mind putting it together in the way that real world proves more effective than the book.

And while of course not preferred, I could double wall the entire L that the new island wall will be...do you think 45 degree bends would provide better drainage than 90 degree bends or has experience shown it doesn't make a difference? Please note I can control what goes down the drain...but kitchen sink...who knows what the family may drop down there so I'd certainly want to optimize drainage here

Ethan

 

[frodo]

90 degree bends are bad ju ju, on a trap arm, any offset over 90 degrees requires a clean out.

no fall over 1/4'' per foot, you can have to much fall, the water will run off and leave the solids in the pipe

you want the water to wash the solids out.

 

[eag379]

Really appreciate it guys, and thanks Frodo for the extra mile of the picture. To you it's every day stuff, to me, it's genius. Thanks again!

Ethan