How To Change Plumbing For A Deeper Sink

jadnashua

Retired Defense Industry Engineer xxx

• #2

It may be possible, but the vent MUST occur after the trap and before the drain line goes downward. If your locale allows it, you might be able to use an AAV, but a existent atmospheric vent is always the improve choice when available.

Terry

The Plumbing Magician

• #5

A vent needs to be higher than the trap arm for the p-trap to prevent siphoning of the trap.

Information technology used to be that a deep sink was 8". At present kitchen sinks are often ten" deep, pregnant that in that location are plenty of roughed in sinks that won't drain the disposers fully when the kitchen counters are redone with an undermount 10" deep sink. I've changed my standard rough-in to 16" off the floor at present for that reason.

• #half-dozen

Thanks Terry, got it. I've fastened a motion-picture show to explicate a little better. Hatching is all open up expanse nether sink. To right side of studs is exterior. DWV position is theorized although looking exterior at the roof line there is no vent through the roof anywhere near this theorized location. Drain pipe runs through 3 studs, then drops downwards through floor where I can run into it in basement, and jogs over 12" or so and runs the rest of the length of the firm downwardly the joist.

What I'm looking to do is drib straight downward through the floor under the sink, in the back side, and tee into this line. Information technology'south kind of tight where I can admission is as it'due south the terminal joist earlier the block wall in the basement so I only take near three fourths of the joist opening to work in to try and tee this into.

Last edited: Mar 21, 2018

Terry

The Plumbing Magician

• #7

Information technology looks similar you lot can add a wye to that to get over to the sink.

• #9

Terminal edited past a moderator: Mar 22, 2018

• #14

So to be clear. When you mensurate the distance from the cabinet floor, the eye of the drain pipe opening is two inches college than the center of the garbage disposer drain opening?

I think he was saying the left ends of the orange and yellow lines are 1/ii inch college than the right ends.

This would have been a good place for one of those sinks with a shallower disposal side.

Concluding edited: Mar 22, 2018

jadnashua

Retired Defense Industry Engineer xxx

• #17

One easy and code compliant way to add a section of pipe in when you tin't spread information technology apart is to use banded couplings. These are a condom sleeve with metal reinforcement around them. Yous could as well use a repair coupling, just those can be a pain to get on before the cement sets upward. A repair coupling doesn't have a center terminate, so you slide it one way, so endeavor to slide it back before the cement grips so that it is and then centered over the joint. A banded coupling is much easier only more than expensive.

• #18

Yes, right. Garbage disposal waste product about one/ii" lower than entrance of the drain pipe into the wall (the highest point). And for sure, an viii" sink would've solved it (this ane is 10"), or a shallower disposal side. Monday morning quarterbacking with that though, the counters are in and so is the sink. Judge I'll utilise some repair / existing PVC couplers and try to get enough room nether the joist to finagle in a wye. I would think because I'm joining into the existing line that is dropping downwardly through the floor in that earlier picture show, that it will vent there. I'k going to put a vertical stack on the new bleed line I'm putting in, 6" upwardly, and cap information technology. If it'due south not draining well I volition put on a mechanical vent under the sink.

If you run a new drain line, you can use the existing drain line as your kitchen sink p trap vent connection. Your nowadays drain is vented, and it will be dry out afterward you lot make a new drain pipe connection. No AAV would exist required.

Last edited: Mar 22, 2018

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