How far can a countertop overhang without support?
The allowable unsupported overhang depends on the material, thickness, cutouts, shape, cabinet support, and manufacturer or fabricator requirements.
Stone, quartz, porcelain, wood, laminate, and solid surface have different span limitations.
A narrow overhang on a continuous cabinet run may need less support than a deep seating area.
Cooktop and sink cutouts reduce strength and can change support needs.
The fabricator should specify brackets, corbels, steel plates, or hidden supports before cabinets are installed.