Slight Cupping in new walnut countertop
I just had a random width walnut countertop installed on the island of our new home. It measures approximately 50" (widest portion) x 80" with a 12" overhang. It is not a rectangle, more like a triangle with a curved radius. The 50" side has slight cupping; if I had to guess, I'd say 3/8 to 1/2". The countertop was made by a local "master countertop fabricator." He claims that this is quite common with a large countertop and we should install a few brackets beneath the overhang to minimize and control the cupping.
Why did this happen?
Am I going to have problems?
What should I do?
I appreciate any help you can give me.