Kitchen Sink Venting Options

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.

Kitchen sink venting options. Ensure to install it no farther than 3 1 2 feet from the bottom of the. Installing an aav to vent a sink is fairly easy whether you are replacing an old existing vent or putting one in for the first time. Venting the plumbing in an island sink putting a sink in an island in the middle of the kitchen presents some plumbing challenges. As an alternative most plumbers recommend a special type of vent that loops as high as it can go inside the cabinet before heading under the floor and over to the main vent in the wall.

Use the pvc sanitary tee for a 2 inch waste line. A regular kitchen sink adjacent to a wall has a vent hidden in the wall that connects to the drain. It might seem like all hope is lost but don t let that small roadblock get in the way of your dream kitchen makeover. Use an island vent which is the most popular method to vent an island sink.

These valves are gravity operated devices that respond to the negative pressure of draining water and open to let air in. So it won t plug up the vent must rise six inches above the overflow level of the sink before the pipe goes horizontal. Check local codes to see which methods are accepted in your area then choose the method that requires the least number of holes or notches in studs. Install a sanitary tee in the sink s drain line inside the wall cavity.

Step 1 use island vent. One solution is an air admittance valve or aav. And the loop vent. Neither method is exactly foolproof they re allowed in specific circumstances and their acceptance and design are not universal across municipalities states or even code writing entities.

This is best implemented if a fixture rests close to the stack and the top floor of your home allowing the stack to serve as a vent. Obviously a vent pipe in a kitchen island can t do that. 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. This technique allows the water to drain off at a regular speed and provides fresh air to the p trap which is situated right below the sink.

While it is possible to install an aav hidden inside walls during remodeling work it is more common to install them right under the sink cabinet as an adaptation of the pipe joining the drain trap to the. Other venting options other common ways to tie vents into a stack include sanitary crosses revent alternatives and loop vents installed at least 6 inches above flood level. It basically involves tapping into the existing drain trap configuration to install an aav via a new sanitary tee fitting and a short upward extension pipe. The true vent is aligned vertically and attaches to your drain line through the roof.