between 8 inches and 15 inches
Overhangs like those found on a wall pass through, and eating bars of more than 6”, but less than 12”, can be supported with wood or metal corbels. They can also be supported by a relatively new product called a COUNTERBalance™ CounterPlate™.
Solid Surface countertops can overhang 6 inches without additional support (e.g. plywood decking). 3 cm Quartz (engineered stone) can handle a 14 inch overhangs and 3 cm Granite overhangs should not exceed a 10 inch overhang without additional support.
Generally, there are three standard height options for breakfast bar counters: 30 inches, 36 inches and 42 inches above the floor. Within these parameters, the counter height is often staggered so that the work area is either higher or lower than the portion intended for eating, depending on the individual application.
END OVERHANGS If an end of your countertop will extend 12 or more inches beyond the edge of the cabinet that supports it, the end overhang must be supported by braces spaced no more than 24 inches apart. In addition, the outermost braces should be within 12 inches of each of the block’s sides.
Overhangs that exceed 24” requires the use of substrate and posts installed evenly spaced at a maximum of 36” apart. 4. Tops on half walls can be installed using steel supports (supplied by K&D) with overhangs up to 12”. Overhangs greater than 12” will require corbels or legs.
1 to 1 ½ inches
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.
We have to be careful when we install upper bar tops that sit on a 5” knee wall. These overhangs have to be supported by steel braces placed under the countertop and then screwed into the wooden studs in the knee wall. Any granite countertops with more than an 8” overhang should be adequately supported by steel braces.
When installing granite countertops , you will not need an underlayment of plywood if the granite has a thickness of 3 centimeters (about 1 1/4 inches). However, for granite with a thickness of 2 centimeters (about 3/4 inches), you will definitely need to use plywood for support.
A typical overhang for a comfortable seating area should be around 25-30cm (10-12”), this should leave enough knee room and adequate space between the countertop edge and the person seated. Therefore, as the depth of the overhang increases, so does the comfort and usability of the bar .
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.