Code Note: Vents in Islands

Typically plumbing requires a vent for a few purposes, among them: ensuring that sewer gases go through the roof, not into the living space, reducing the risk of bad siphoning, and ensuring optimal drain flow. A kitchen island, however, is not an ideal space for venting. You don’t want a pipe going up through your island and through the roof. One solution is a device called an Air Admittance Valve (AAV). This allows air in for good flow, but does not let sewer gases out. The P-trap of the sink ensures that no sewer gases exit through the sink.

The 2012 International Building Code allows AAV’s, section 918 of the International Plumbing Code. You can pick up an AAV on for $17.

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