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plumbing the kitchen sink drain
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paul the original
Posted 1/3/2019 13:13 (#7217502 - in reply to #7215398)
Subject: RE: plumbing the kitchen sink drain

southern MN
You have a vent problem, and might make it worse if you change the piping as easily as you possibly can.....

All plumbing should have a vertical (45 degrees is considered vertical, and kitchen islands have special rules) vent to your roof, there is supposed to be a network of pipes going up tot he roof that looks very much like the network of pipes going down to the septic/ tile.


It’s difficult to say what you should or could do. In my location it’s against code to drain grey water to the tile, it needs to go to the septic. But are you grandfathered in, then if you change it and your septic is barely getting by it might overload it. Not likely from one extra sink, but....

And in the end you still don’t have the venting right.

The vertical vent should be below the trap of the sink, and typically above the roof. This allows air to suck in or push out as it needs to from your waste pipe, without gurgling the trap.

That would be the real fix to the issue you raise.

Another issue you have that might not be code and for a reason: kitchen sinks put a lot of grease and plant fiber down them. This could clog your pipe or tile.

When the pipe clogs and your basement sump pump kicks in the water can only come up and out your sink. That won’t be a pretty thing to deal with.........

I believe code nearly everywhere it to keep that sump pump discharge on its own closed pipe with no paths to the rest of your house? You didn’t ask about this, but it’s something to consider if you start renovating. Just for this it would be good to separate the sink off the same discharge line.

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