Use an island vent, which is the most popular method to vent an island sink. Like a vent for a typical kitchen sink, a loop vent connects to the trap arm, but instead of rising up through the wall, it rises as high as possible inside the island cabinet before dropping back down, where it goes through the floor and ultimately connects to the vertical vent. QUESTION: I need your expert advice. Generally the venting for a sink goes upward in the wall while the drain water flows downward towards the floor – but in an island, going up is not an option. Plumbing a kitchen island presents problems for venting, because the sink isn't near a wall behind which you can hide the vent pipe. To have a large sink that drains properly you need to keep in mind some basic plumbing principles. Synonyms for island sink vents such as the piping arrangement marked (B) in our sketch above include "Chicago Loop" or "Island Fixture Vent". What It Is. Putting a sink in an island in the middle of the kitchen presents some plumbing challenges. A loop vent is a way of venting the trap installed in an island sink. A loop vent is a type of drain designed to be used in areas where traditional piping isn't feasible. The most common way to do this is by installing a loop vent. in PLUMBING VENT DEFINITIONS, TYPES. The loop vent needs to be modified, but it looks like the current installation is not done correctly, and we may have an inspection issue if we keep it. But there is a gadget that makes installing a sink a … The only salvation for your installation, since it has many things wrong about it, is that by the time siphonage would occur, the flow in the pipes should be small enough that air and water can both flow in the pipe, thus giving a modicum of venting action to prevent the trap siphonage. the vent must run through the roof or connect to other vent piping above the flood-level rim of the fixtures served the cleanout should be installed above the spill level of the fixture. Loop vents may be used at island sinks or "free-standing sinks" where there is no direct route from above the sink's flood rim to a vertical vent stack. Also see DEFINITION of YOKE VENT discussed separately. I don’t know a thing about plumbing, but my dad was a plumber and I remember him saying there’s a special way to install the drain pipes in my island so there’s never any sewer gas in my kitchen. I'm so glad I found this. As part of a kitchen remodel, we are moving our island sink. The vent then turns down, goes through the floor and along the drain pipe, then turns back up to join the main stack several inches above the sink level. Mar 23, 2017 - I came across the method for venting an island sink while browsing threads on vent issues. You must tie the bottom of the vent loop directly into the drain under the floor to allow for any condensate to drain … The "loop" appears to be too LOW for a proper loop vent. 12/20 the vent must meet the distance requirement of section 904.2 and table 703.2, note 6 the connection must be made with a wye My new kitchen is going to have a large island with my double-bowl sink in it. Kitchen Island Sink Plumbing - Do a Loop Vent. Venting an island sink used to mean that you had to run a complicated plumbing vent loop up, down, and under the floor until you reached a wall where you could extend the vent line through the roof. With this method, the vent pipes enter the island cabinet from below the floor, rise as much as possible inside the cabinet, and then join the water drain pipe. Step 1 - Use Island Vent. In kitchen islands and other areas where a vent that runs directly in to the wall isn't able to be placed, a loop vent can be used. Proper Plumbing Vent Specifications for Island Sinks or Peninsula Sinks.