Maximum Overhang Concrete Countertop. You have to separate islands and peninsulas where there's a lot of counter top surface area being weighted to the left or to the right of the overhang that makes it stable to be able to go to that. Cracking in concrete can happen for many reasons but by picking a strong mix with low shrinkage, using a reliable reinforcement, and pouring on a solid base will be the best.
This ask comes up daily and affects layout and allembracing found of many kitchens. Adding thick edges makes the overhang stronger. Support Types How to determine countertop overhang for YOUR project.
Rebar size in Concrete Countertops: It can be too big.
Another prevalent trend in countertops is the use of a "waterfall' countertop.
Different countertop materials have different requirements. The brand is not the only factor though. With modern materials and tools, almost any design that can be dreamed up can be built.