Maximum Overhang For Granite Countertop

According to the marble institute of america you can safely overhang granite that is 1 1 4 thick up to 10 without supports.

Maximum overhang for granite countertop.

The allowable overhang with no additional support is no more than 1 3 of the depth of the countertop and not to exceed 15 total. However you may need to install supports such as corbels or legs. Without any additional support solid surface countertop overhangs cannot exceed 6 engineered stone cannot exceed 14 and granite overhangs shouldn t be more than 10 without additional supports. Yes you can extend the overhang on a kitchen island countertop.

Most granite fabricators will recommend support brackets on overhangs over 12 however solely based on the overhang amount. Can you extend the overhang on a kitchen island countertop. Nkba standards recommend 12 quot. The corbels must be designed to support the weight of the countertop and be mounted to studs.

Once your countertop overhang exceeds these numbers it will require additional support through corbels base cabinets or knee walls. High counter seating and 18 quot. You can see that in all cases the recommended. According to the marble institute of america you can safely overhang granite that is 1 inches thick up to 10 inches without support.

Overhangs greater than 15 require the installation of corbels. The marble institutes 12 inch guide line may lead person to believe that it is ok to have 12 inches of overhang when in this situation it would immediately fall off the wall and potentially injure anything with feet in the path of the falling granite. However the cantilevered portion cannot be more than 1 3 the total width of the countertop. However the cantilevered portion cannot be more than one third the total width of the countertop.

So we are ok on the first criteria but we exceed the 1 3 criteria by four inches. Bar height seating 15 quot. So to clarify the maximum overhang is the lesser of 2 3rd or 12 inches. You can go with a normal granite up to 7 if you have like ceaserstone ore silestone you can go with one inch more but in your 25 overhang you need at least 20 brackets and your overhang will not be fully used because more than 15 is useless.

Of overhang for 42 quot. The marble institutes 12 inch guide line may lead someone to believe that it is ok to have 12 inches of overhang when in this situation it would immediately fall off the wall and potentially injure anyone with feet in the path of the falling granite. If you only have 6 inches of stone on top of a wall cap then the maximum safe overhang is 2 inches following the 2 3rds rule.