DIY Builds
Photo: Sirirak Boonruangjak
Air gaps should be located in places where that discharged water will go to the drain; not all over a countertop, and especially not underneath a countertop.
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These are! They guide you every step of the way to complete your dream shed.
Learn More »It’s been just over a year since Minnesota adopted a new state plumbing code. One of the most conspicuous and annoying changes that was made to the plumbing code was the requirement for hideous dishwasher air gaps. A dishwasher air gap is an egg-sized device that gets mounted above the sink to help prevent contaminated water from draining back into the dishwasher. These devices have been around for a long time, but they were never required in single family homes in Minnesota. Our old plumbing code used to say “Domestic use dishwashers may discharge into a sink, or discharge to a sink tailpiece or food-waste grinder if the discharge drain line is fastened as high as possible under the countertop.” That’s no longer good enough, however. The new code that was adopted on January 23rd, 2016 says the following under section 807.4: No domestic dishwashing machine shall be directly connected to a drainage system or food waste disposer without the use of an approved dishwasher air gap fitting on the discharge side of the dishwashing machine. Listed air gaps shall be installed with the flood-level (FL) marking at or above the flood level of the sink or drainboard, whichever is higher. The nitty-gritty details of exactly how this is being enforced throughout Minnesota is up to the professional judgment of the plumbing inspectors for each municipality. From what I’ve heard, air gaps are typically being required at the time that sinks or dishwashers are installed or replaced.
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The problem with this is that the undersized hose won’t handle all of the water flow when it’s no longer under pressure, which will cause the water to discharge out of the air gap, which should not happen under normal conditions. Here’s a quick video clip showing what that looks like. The other installation error that we’ve come across has been improperly located air gaps. As you might guess from the video clip above, if anything goes wrong with the discharge hose, an air gap will spit out water. Air gaps should be located in places where that discharged water will go to the drain; not all over a countertop, and especially not underneath a countertop.
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