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Whats the difference between an undermount and topmount (or ‘self-rimming) sink?

April 26, 2017sink topmount undermount

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Whats the difference between an undermount and topmount (or ‘self-rimming) sink?

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A topmount sink has a lip that folds over the countertop and is therefore resting on top of the countertop cutout. Fasteners securely mount an undermount sink underneath the countertop so that a polished edge of granite, marble, etc. is exposed above the sink. An undermount sink cutout requires more polishing and installation labor than a topmount sink cutout and is therefore a more expensive option.