How Much Overhang for an Undermount Sink?

Features

• The overhang on an undermount sink provides a straight edge around the perimeter of the sink, hiding any imperfections in the construction of the sink that may be present and ensuring that all fixtures holding the sink to the countertop are covered up. Overhangs are therefore common when using a prefabricated sink from a different manufacturer than the counter's maker.

Benefits

• Overhangs allow sinks from one manufacturer to be removed from a counter and replaced with sinks from another manufacturer because the overhang hides any slight difference in length or width of the sink itself. The overhang also allows the caulk line to be hidden beneath the counter, which results in a cleaner appearance.

Size

• The average size of the overhang is 0.2 inches (5 millimeters). This ensures there is sufficient overhang to cover any imperfections in sink measurement or placement. In addition, the small overhang prevents a large and unsightly lip around the edge of the sink, which would otherwise ruin the usability of the sink.

Alternatives

• There are two alternatives to an overhang on a sink. A flush sink is a special fitment where the hole in the counter is cut to the exact size of the bowl. This is an uncommon fitting due to the extra care required when cutting the counter. The second alternative is a “negative overhang,” where the rim of the undermount sink bowl is visible due to a larger counter hole.