Glory Kitchen Island Vent Pipe

Install the vent between the sink p trap and the point where the waste line leading from the trap drops to the main sewer.

Kitchen island vent pipe. A regular kitchen sink vent must rise at least 6 inches above the fixture before going horizontal. An island fixture is a fixture remote from a plumbing wall and requires special venting that differs. One solution is to install a vent that loops under the floor.

Code expert glenn mathewson describes three ways to vent a kitchen island. The intent of this bulletin is to clarify the use of special venting for island fixtures commonly known as loop venting to be used at other sink locations when structural framing conditions prohibit the standard plumbing vent. The first drawing shows a simple method but one that is not accepted by all municipalities or plumbing inspectors.

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. Here we include definitions of plumbing vent terms types of plumbing vents plumbing vent size requirementsand in a companion article we give plumbing vent clearance distances to building roof vertical walls nearby windows or plumbing vent distance to. The old school method of venting island sinks is appropriately called an island fixture vent in IRC Section P3112.

Using a bow vent for an island kitchen sink with an emergency drain. Heres how it works. Putting a sink in an island in the middle of the kitchen presents some plumbing challenges.

In situations like Marthas kitchen island where you simply cant install a traditional vent pipe that is hidden behind the plumbing fixtures the best solution is a traditional loop vent. The two island sink photographs just above show a recent 2014 island sink installation in. If you dont have a vent on your sink drain you can use one of these air admittance in line vents from Oatey here.

It cant be vented the same way as a regular kitchen sink. The vent pipe is hidden within the wall. Plumbing a kitchen island presents problems for venting because the sink isnt near a wall behind which you can hide the vent pipe.