Our island has an 18 inch overhang with a 1/2 inch square steel support. It runs across the full width of the overhang and runs back to the cabinets under the counter top at each end.
I have received three quotes from reputable companies for installation of a granite countertop. We currently have travertine, which was (poorly) installed before we purchased the house.
Along one side of the kitchen, we have cabinets with a cabinet height wall behind them and a regular 1.5 inch overhang. When we get the granite, we'd like to have a 12 inch overhang to form a breakfast bar for the little ones. I didn't want corbels, so I had been reading up on L-brackets and "invisible" supports so I could address the issue when it would come up during the quoting process. To my surprise, each of the three companies said that supports are not needed for a counter height breakfast bar with a 12 inch overhang because it will be a single slab of 3 cm granite which will also span over the cabinets and a wall. My Googling seemed to show that anything over 10 inches needs support.
Do I need to support the overhang? if so, how many supports would I need, what type, and how far apart? It's 48" wide.
