Drain piping on a Dishwasher

[jfunderburk (Joe Funderburk, CMI)]

Bob, thanks. But is it REQUIRED?

[belliott (Bob Elliott, 450.0002662)]

@jfunderburk

Bob, thanks. But is it REQUIRED?

Depends on AHJ near you.
In Chicago the airgap devices are required but high loops accepted.
Hell with code as I would recommend it.

[bkelly2 (Brian Kelly, AZ Cert. # 60234)]

@jfunderburk

Bob, thanks. But is it REQUIRED?

After looking at it again Joe, I would say yes. If the trap is cloged, the drain will back up until it reaches the DW drain line and then run back into the DW. The reason the high loop goes up to the bottom the flood rim is so when there is a backup you will see the water in the sink.

[dvalley (David Valley, License #566 - CMI)]

@jfunderburk

David, we as home inspectors should avoid falling into the trap of telling the homeowner how to do repairs.

I totally disagree.

I tell all my clients how to fix/repair most simple defects, and explaining a high loop installation takes me approximately 15 seconds.

[rmaday (Rick Maday)]

@jfunderburk

Bob, thanks. But is it REQUIRED?

In Illinois, yes.

a) Domestic Dishwasher (Private Residence). When a domestic dishwashing machine drain line is connected to the house side of a trap from a sink, the drain from the dishwasher shall be carried up to the underside of the spill rim of the sink. Dishwashing machines shall discharge separately into a trap or tail piece of the kitchen sink and shall not connect to the food waste disposal unit.

[cevans (Chuck Evans, CMI)]

@jfunderburk

Does there need to be a high loop (in my area is is permitted) when the DW doesn’t connect directly to the disposal? See the attached pic. DW has no high loop, connects to the tail piece on the left sink.

If your AHJ goes by IRC, then yes. Loop should extend to underside of counter. Sinks without disposers can back up too