Stone countertops are extremely heavy and require precise structural support. Before installation, ask your fabricator if your base cabinets require additional bracing. Discuss the use of under-counter plywood substrates for extra rigidity and whether steel rods or clips are necessary for load distribution, especially across long spans like islands or near expansive sink cutouts. Confirming that your cabinetry is plumb, level, and square is the most important step in protecting your stone investment.
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What questions should I ask about the structural support needed for stone countertops?
Ask installers if your existing cabinetry is level and capable of supporting the dead load of heavy stone. Inquire if additional plywood decking or steel reinforcement rails are required to prevent cracking, especially near long spans or large sink cutouts.