Countertop Overhang Support Requirements

Quartz countertops often do not need support brackets.

Countertop overhang support requirements.

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. It is a standard installation rule that 70 of the total countertop width of a countertop must be supported by base cabinets knee walls corbels etc. Standard countertop overhang is 1 inches. Kitchen island countertop.

While some countertops may have different overhang measurements this is the number that is seen as standard for homes. Adding thick edges makes the overhang stronger. Different countertop materials have different requirements. One arm supports the countertop and the other arm.

Solid surface tops that are thick that extend beyond the cabinets by six inches or more need overhang support. Risk damage to your countertops by using a bracket that is not strong enough to support them. Fabricating and installing overhang countertops as a general guideline support is required for overhangs of corian solid surface extending more than 6 152 mm in 1 2 12mm material and overhangs extending more than 12 305 mm in 3 4 19 mm material. For overhangs up to 12 inches corbel bracing is added for support.

For structures with supports on only 3 sides areas around dishwasher counters cabinets structure an additional support will be required under the silestone. According to the corian fabrication manual the strength of the overhang may be tested by suspending a 100 lb. Keep in mind that this is 1 inches over the front edge of the base cabinet. Corbels are 90 degree decorative braces that fit up under the countertop.

The maximum overhang without support is approximately 15 for 1 1 4 material in a narrow bar or 11 in 3 4 material in an island. As the chart indicated solid surface countertops may only overhang 6 inches without additional support. The bottom line is that the overhang must be properly supported. Considering that granite marble and limestone can have overhangs weighing hundreds of pounds and considering how brittle granite countertops can be granite support brackets are imperative.

How to install supports for an overhang or kitchen island. If the deflection of the solid surface is greater than 1 4 the support is inadequate. 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. Don ts of countertop supports.

Wait to the last minute to purchase your countertop supports. Use granite countertop support brackets to support countertops with overhanging stone. Neglect planning your countertop layout and support. Once your countertop overhang exceeds these numbers it will require additional support through corbels base cabinets or knee walls.