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rfire15 09-29-2011 07:57 PM

kitchen revamped, help with sink drain plumbing
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Hello. Hope someone can provide an easy solution. Kitchen sink was moved to corner and now sits almost 8 feet from the original stack. Stack is only 1.5 inch cast iron which actually feeds kitchen as well as the utility sink in basement which has washer drain into it also the sink in the down stairs bathroom.

This seems like a bit much for a 1.5 inch pipe but I guess that's just how they rolled in the 50s?

Anyway I do not plan on ripping the house apart including ripping up the basement floor but what are my options for moving this sink over? I believe code says 5ft for 1.5 inch pipe before it needs another vent. I would really rather not use a aav if possible. Going to try and attach pic, doing this with phone so bare with me....

In pic you can see where old drain was, new drain will have to go in that far corner

oh'mike 09-29-2011 08:03 PM

Let me guess---the cabinets are already installed?

Kinda put the cart before the horse----

Post a picture of the upstairs and is this a single story or 2 story house.

rfire15 09-29-2011 08:09 PM

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No cabinets are not installed, finishers should have the room paint rdy by tomorrow.

I could maybe re pipe that vent a bit, do a T off it and connect the vent farther up that pipe... And even run 2inch drain to that part if it might help.... Nothing I can do ultimately about that overall drain being 1.5 inch though

rfire15 09-29-2011 08:11 PM

Sorry, 2 story but on that side of the house it is attic space on 2nd floor... Cape cod

oh'mike 09-29-2011 08:19 PM

1 1/2 inch will be fine for a kitchen drain---2 is better but 1 1/2 will work--

You should have gotten the vent into that wall before you finished the drywall---now you are stuck with an AAV or a lot of drilling to get the vent above the drain line and back to the old vent.

If it were my job ,I'd cut the old pipe 9" above the basement floor--repipe the slop sink and lower the kitchen drain away from the ceiling --allowing the vent return pipe to hug the floor joists.

A wide angle shot of the pipe to the floor and up to the ceiling would help---

rfire15 09-29-2011 08:33 PM

I could do that, T off the slop sink and run drain closer to floor then up the corner to the kitchen.

Is it ok to loop the drain vent up inside the sink base (using a T under the sink) then back down into the basement... Then can run the pvc along the floor joists back to the vent. Will just redo the whole stack with pvc and connect it to the old cast iron at the bottom and top... I guess that's what u ment?

oh'mike 09-29-2011 08:45 PM

No on the loop--you will create a giant P-trap that will fill with condensation and stop working.

Run drain pipe below window---vent above the window--pitched to the drain--attach vent to old existing pipe.

Sorry I'm not long on words tonight---I'm tired.---Mike---

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