Steel Support for an Overhanging Granite Countertop Advice on the use of structural steel to support a stone counter, without overkill or excessive weight (and cost).
Our fabricator made relatively flat (think they're about 1/2" thick) steel bars to support it. The bars fall shy of the ends of the overhangs by about 4 inches. Our granite simply sits on top of the bars and are secured with silicone, though the weight of the stone will keep it pretty much in place on its own.
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Granite Install... 4 Tips For A Smooth Installation Countertop Support Guide This granite install overview answers some basic questions and provides useful tips on granite counter installation, finding a granite installer, and how to spot the difference between quality stone installation and shoddy work.