Marble Restoration & Stone Care Service

Granite Countertop Crack by Sink Caused by Rusted Internal Rod – After Repair

What looks like a random crack appearing near a kitchen sink is often a sign of a very specific and preventable failure: a rusting internal metal rod. During fabrication, stone fabricators embed a steel rod into the underside of the slab along the sink cutout to reinforce the thin strip of granite during transportation and installation. Once the countertop is set on cabinets, that rod serves no structural purpose – but if moisture ever reaches it, it becomes a liability.

As carbon steel rusts, it expands. That expansion exerts tremendous pressure from inside the stone, and since granite cannot flex, it splits. The crack typically follows the line of the rod, running parallel to the sink edge. A surface patch alone cannot fix this; the rusted rod must first be physically removed before the stone pieces can be rejoined with colored epoxy and re-polished.

This countertop shows the result after a full repair: the damaged section was detached, the oxidized rod extracted, and the slab reassembled with precision. Keeping sink caulking intact is the most effective way to prevent water from reaching the rod in the first place.

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