Which Gauge for an Undermount Sink?

Characteristics

• When comparing metal sinks, lower gauge numbers are thicker than higher gauge numbers for all metals. Sinks are most commonly made of stainless steel, but all types of metal sinks with lower gauge numbers usually cost more. In 2011, prices for mid-quality undermount sinks range from about $180 to $320, according to the website Homewyse. The highest-quality undermount sinks can cost more than $400.

Choosing a Gauge

• Your undermount sink will be less likely to dent or bow if it's constructed from a thicker metal, and it will transmit less noise than a thinner metal when pots, dishes and water strike its surface. The gauge numbers of metal sinks generally range from 15 to 22. Higher-quality sinks for home use have a 16 or 18 gauge, but average residential sinks have a 20 or 22 gauge. Look for a 15-gauge sink -- the type installed in restaurant kitchens -- if you want an even more durable, commercial-quality brand in your home.

Deep-Draw Process

• An undermount sink's gauge is based on the gauge of the metal at the start of the manufacturing process. However, the gauge may not be consistent throughout the entire sink. This is because most metal sinks go through the "deep-draw" forming process in which a sheet of metal is stretched into the shape of the sink. Stretching usually causes some areas of the sink to be thicker than others. Deep-draw formation is a standard process, and the varied thicknesses are unavoidable.

Zero-Radius Alternative

• Zero radius undermount sinks are more likely to have a uniform gauge. The zero radius manufacturing process involves bending, but not stretching, metal into a particular shape. The bottom of the sink is formed under high pressure, and the sides are bent in a 90-degree angle and welded together. These sinks add a commercial look to a home kitchen because their flat sides and 90-degree corners resemble restaurant sinks.