How to support granite island overhang

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Old 04-24-14, 10:53 PM
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How to support granite island overhang

Our counter installers told us that we didn't need any support for our island overhang initially. However, after installing we were told that we need to install corbels and/or posts. It's a 100 inch span of 3 cm granite. We decided to add two legs on either corner and three corbels. Because we can't get to the back of the cabinet, we screwed the corbel into the framing trim and then glued and nailed the trim piece into the cabinet. However, there is a slight space between the corbel and the granite. My question is, is it okay to shim the space between the corbel and the granite and add silicone, or does it not matter because two posts will be sufficient support (e.g., the corbels could just be decorative)? Maybe there's another way to attach the corbels? I've attached a pic.

Thanks in advance for your advice.
 
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Old 04-25-14, 04:36 AM
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The korbel you have installed should be sufficient with others. Shimming as you have done is the only way to ensure you have constant contact with the granite. Just cut the shims off flush and caulk around the edge if you want. Most times it is unseen and is not caulked. Did you screw the korbels in from the inside of the cabinet? Usually a better way to do it so as to provide sightless attachment.
 
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Old 04-25-14, 08:20 AM
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Why didn't you mount the corbel so that it came in contact with the counter top? It should have been push tight to the counter top, and like Chandler said screwed from the inside of the cabinet. It still not to late to do that. You may have to fill the screw hole you already made but it won't show anyway.
When I build cabinets I screw a small block to the cabinet, then put some "Grabit" on the top of the block before the counter is set. Granite is heavy enough it shouldn't move unless rammed into really hard, then it's not going to move by much. Depending on the size of the island, it probably took 4 men to set it?? Despite what people think, that large of an overhang will break off if sat on. That's why your builder told you to add supports.
 
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