My island is 100 l contractor put roughtop down cut to shape before fabricator templated countertop.
Under granite corbels should match cabinet.
Corbels posts and steel brackets.
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These corbels may be used on either side by simply moving the metal keyhole plate to the other side.
We can span up to 3 0 from cabinet to cabinet when 1 1 4 inch thick granite is used.
The fabricator will use mesh under the countertop at the dishwasher location for 1 1 4 inch thick granite.
I have 2 corbels under the 12 section.
If using 3 4 inch thick granite with plywood subtops you should also be fine without adding additional support.
For designs where your countertop is cantilevered or overhangs the supports overhanging portion should be limited 16 to 24.
No way should 15 of granite be unsupported.
Use granite countertop brackets when overhanging stone counters.
You can find them on amazon or at your local hardware store and they are pretty inexpensive.
Choose a corbel that is 1 2 less than your.
It is bow shaped w 7 overhang on ends 12 in center.
Corbels are brackets similar to shelf brackets that create an l shape in order to transfer the load down from the countertop to the wall or cabinet below.
Either corbel side is easily mounted to the wall with the metal keyhole plate.
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I wasn t home when this was done but i m 99 sure corbels went on before roughtop.