Re-routing kitchen drain, do I need to bring to code?
The old route for our kitchen sink was problematic and we want to re-run via a different path in the basement which will make for a shorter run. I know that we have to use a certain slope for proper drainage (1/4" p/foot I believe) but my problems are:
Our current drain is 1-1/2", I believe code is now 2". By disturbing this, I assume I will have to upgrade to the 2".
Our current sink configuration does not have a vent, I assume when the house was built in 1975 or thereabouts that it passed code and then it was OK, now if I am rerunning the drain line and disturbing all this, will I now have to add a vent pipe for the kitchen sink?
That said, yes, the minimum size for a kitchen sink drain is now 2" It would be a good idea to upsize since you are going to the trouble of replacing it.
You should also add a vent. If the wall isn't open, and your area allows it, you COULD use a studor vent. I prefer a conventional vent whenever possible, but there are situations where the studor vent comes in handy.
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Just to add to what Allen said- if you increase to 2"-and you should if possible- be sure you do not decrease back to 1.5" when you tie into the main. You must replace the fitting (wye or tee) in the mainline also.
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