I keep running into this setup and usually call it out as not being vented correctly. The sink drains into a 3” pipe. Just looking for confirmation that I’m correct or some criticism if I’m wrong…. Thanks!
You are correct sir…that is not vented at all that I can see, let alone properly vented…
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I was pretty sure of it but I’ve been seeing a lot of these lately so just wanted to make sure. Thanks, Jim! Missed seeing you and your wife when we were in town. I’ll plan better next time!
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In Florida we are allowed an oversized drain to serve as a vent for island and peninsula sinks. It has to be vented within so many feet of the drain. This is common here and we see it a lot in new construction.
Section P3112 Island Fixture Venting
P3112.1 Limitation
Island fixture venting shall not be permitted for fixtures other than sinks and lavatories. Kitchen sinks with a dishwasher waste connection, a food waste disposer, or both, in combination with the kitchen sink waste, shall be permitted to be vented in accordance with this section.
P3112.2 Vent Connection
The island fixture vent shall connect to the fixture drain as required for an individual or common vent. The vent shall rise vertically to above the drainage outlet of the fixture being vented before offsetting horizontally or vertically downward. The vent or branch vent for multiple island fixture vents shall extend not less than 6 inches (152 mm) above the highest island fixture being vented before connecting to the outside vent terminal.
P3112.3 Vent Installation Below the Fixture Flood Level Rim
The vent located below the flood level rim of the fixture being vented shall be installed as required for drainage piping in accordance with Chapter 30, except for sizing. The vent shall be sized in accordance with Section P3113.1. The lowest point of the island fixture vent shall connect full size to the drainage system. The connection shall be to a vertical drain pipe or to the top half of a horizontal drain pipe. Cleanouts shall be provided in the island fixture vent to permit rodding of all vent piping located below the flood level rim of the fixtures. Rodding in both directions shall be permitted through a cleanout.
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This is most likely a combination waste and vent system. I’ve never seen it used in residential plumbing.
I like the clean out at the end of the run.
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