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Quartz countertops often do not need support. Granite supports can be either functional, decorative, or both depending on your granite countertop installation. And unlike laminate countertops that do not require supports, natural stone countertops require some thought and understanding of why and how they will be used.
Regarding this, how do you support a granite countertop?
As a granite support guide, in designs where your countertop spans supports, the length of the span (side to side as your facing it) should be 16 to 20 inches. For designs where your countertop is cantilevered or overhangs the supports, overhanging portion should be limited to 2 to 3 inches from the outer edge.
Beside this, do you need support for granite overhang?
According to the Marble Institute of America, you can safely overhang granite that is 1- 1/4″ thick up to 10″ without supports. However, the cantilevered portion cannot be more than 1/3 the total width of the countertop. So, we will need corbels or supports to keep the countertop from being in an unbalanced condition.
An unsupported span of 24” and up to a maximum of 36” is acceptable as long as the stone is supported on both sides of the span. Longer spans must be supported across the span. Over hangs should be not exceed 6” for 2cm granite, 10" for 3cm granite and 15" for 3cm quartz beyond the supported area.