Fabulous Granite Countertop Overhang Support Requirements

But they also say the cantilevered portion cant be more than 13 the total width of the countertop.

Granite countertop overhang support requirements. The standard overhang is just 15 inches over the cabinet so that will not require any support. The size of your granite support legs and brackets will be based on your overhang. Our countertop brackets have a right-angle design that resists bending and breaking.

Corbels can support no more than 24 of the overhang. So lets say your countertop will be 18 inches wide with a 10 inch overhang. Fasten your supports to the most substantial support available.

The Marble Institute of America says you can cantilever 1-14 inch granite up to ten inches without additional support. In designs where the countertop is cantilevered or overhanging the supports the cantilever shall be limited to 6 150 mm for ¾ 20 mm thick countertops and 10 250 mm for 1¼ 30 mm countertops but in no case may the cantilevered portion represent more than 13 of the width of the countertop. I know for a fact that you do not need a sub-top if you use material like Black Absolute or colors with little veining or crystals.

As long as the wall is securing most of the weight youll be okay. Use a countertop support that extends to within 4 inches of edge of your countertop. Any island or countertop with an overhang over 10 must have extended build-up strips that reaches the front of the build-down strip.

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. The allowable overhang with no additional support is no more than 13 of the depth of the countertop and not to exceed 15 total. It has a 15 overhang for seating and everything I read states anything over 10 needs support.

Dos of Countertop Supports Ensure your supporting structure is sufficient for holding your countertop and supporting brackets or corbels. However if the design of your countertops has a longer overhang and cantilevers then you have to show that to your countertop. Generally the standard overhang of a countertop is 1 to 1 ½ inches from the cabinet while the exposed ends of a countertop will usually have a ½ inch overhang and the ends that meet a wall dont have any overhang at all to keep the fit flush to the wall.